The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang

Abstract

We propose a cosmological scenario in which the hot big bang universe is produced by the collision of a brane in the bulk space with a bounding orbifold plane, beginning from an otherwise cold, vacuous, static universe. The model addresses the cosmological horizon, flatness and monopole problems and generates a nearly scale-invariant spectrum of density perturbations without invoking superluminal expansion (inflation). The scenario relies, instead, on physical phenomena that arise naturally in theories based on extra dimensions and branes. As an example, we present our scenario predominantly within the context of heterotic M-theory. A prediction that distinguishes this scenario from standard inflationary cosmology is a strongly blue gravitational wave spectrum, which has consequences for microwave background polarization experiments and gravitational wave detectors.

67 pages, 4 figures. v2,v3: minor corrections, references added

References in corpus (76)

• A Large Mass Hierarchy from a Small Extra Dimension
• An Alternative to Compactification
• The Hierarchy Problem and New Dimensions at a Millimeter
• New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
• Phenomenology, Astrophysics and Cosmology of Theories with Sub-Millimeter Dimensions and TeV Scale Quantum Gravity
• Heterotic and Type I String Dynamics from Eleven Dimensions
• Eleven-Dimensional Supergravity on a Manifold with Boundary
• Out Of This World Supersymmetry Breaking
• Modulus Stabilization with Bulk Fields
• Hybrid Inflation
• Modeling the fifth dimension with scalars and gravity
• Pre-Big-Bang in String Cosmology
• Brane Inflation
• Strong Coupling Expansion Of Calabi-Yau Compactification
• Reconstructing the Inflaton Potential --- an Overview
• Density Perturbations and Black Hole Formation in Hybrid Inflation
• Grand Unification at Intermediate Mass Scales through Extra Dimensions
• Heterotic M-theory in Five Dimensions
• TeV Scale Superstring and Extra Dimensions
• Self-tuning flat domain walls in 5d gravity and string theory
• Couplings and Scales in Strongly Coupled Heterotic String Theory
• Infinitely Large New Dimensions
• On the Four-Dimensional Effective Action of Strongly Coupled Heterotic String Theory
• Relic Gravitational Waves from String Cosmology
• Cosmological Solutions of Horava-Witten Theory
• Brane World
• Aspects of Type I String Phenomenology
• Casimir Effect Between World-Branes in Heterotic M-Theory
• Effective Field Theory for a Three-Brane Universe
• Cosmic Microwave Background Probes Models of Inflation
• Warped Compactifications in M and F Theory
• Pyrotechnic Universe
• Stabilization of Sub-Millimeter Dimensions: The New Guise of the Hierarchy Problem
• Large radii and string unification
• Standard-like Models with Broken Supersymmetry from Type I String Vacua
• Non-standard embedding and five-branes in heterotic M-Theory
• String-Unification, Universal One-Loop Corrections and Strongly Coupled Heterotic String Theory
• Holomorphic Vector Bundles and Non-Perturbative Vacua in M-Theory
• Boundary Inflation
• Gaugino Condensation in M-theory on S^1/Z_2
• Non-conservation of Global Charges in the Brane Universe and Baryogenesis
• A D-Brane Alternative to the MSSM
• Large Extra Dimensions and Cosmological Problems
• Large-Volume String Compactifications, Revisited
• On the Problem of Predicting Inflationary Perturbations
• The Ten-dimensional Effective Action of Strongly Coupled Heterotic String Theory
• Branes with GUTs and supersymmetry breaking
• Heterotic Anomaly Cancellation in Five Dimensions
• Axions and the Strong CP Problem in M-theory
• Domain Walls and Superpotentials from M Theory on Calabi-Yau Three-Folds
• BPS Branes in Cosmology
• Infrared Hierarchy, Thermal Brane Inflation and Superstrings as Superheavy Dark Matter
• Supersymmetry Breakdown at a Hidden Wall
• Four-Dimensional Effective Supergravity and Soft Terms in M-Theory
• Small Instanton Transitions in Heterotic M-Theory
• Pre-big bang bubbles from the gravitational instability of generic string vacua
• Gaugino Condensation, Moduli Potentials and Supersymmetry Breaking in M-Theory Models
• Chiral Gauge Theories from D-Branes
• Instabilities in heterotic M-theory induced by open membrane instantons
• Five-Dimensional Aspects of M-Theory Dynamics and Supersymmetry Breaking
• Domain walls in five dimensional supergravity with non-trivial hypermultiplets
• Stringy World Branes and Exponential Hierarchies
• Moduli Spaces of Fivebranes on Elliptic Calabi-Yau Threefolds
• Non-Perturbative Vacua and Particle Physics in M-Theory
• Manyfold Universe
• A Five-brane Modulus in the Effective N=1 Supergravity of M-Theory
• Local Anomaly Cancellation, M-Theory Orbifolds and Phase-Transitions
• Soliton Solutions of M-theory on an Orbifold
• M(ore) on Chiral Gauge Theories from D-Branes
• Domain walls of D=5 supergravity and fixed points of N=1 Super Yang Mills
• Compactification and Supersymmetry Breaking in M-theory
• Moving Domain Walls in $Ad{S}_5$ and Graceful Exit from Inflation
• Exponential Hierarchy From Spacetime Variable String Vacua
• Soft Terms in M-theory
• Five-Dimensional Gauged Supergravity and Supersymmetry Breaking in $M$~Theory
• Five-Brane BPS States in Heterotic M-Theory

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• Fermi-bounce Cosmology and scale invariant power-spectrum
• The B-L/Electroweak Hierarchy in Smooth Heterotic Compactifications
• Reheating after S-Brane Ekpyrosis
• Modulated Perturbations from Instant Preheating after new Ekpyrosis
• Universal signature of quantum entanglement across cosmological distances
• Constraints on a scale invariant power spectrum from superinflation in LQC
• Dynamics with Infinitely Many Time Derivatives in Friedmann-Robertson-Walker Background and Rolling Tachyon
• Equivalence between domain-walls and "noncommutative" two-sheeted spacetimes: Model-independent matter swapping between branes
• Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy
• Bounce Inflation Cosmology with Standard Model Higgs Boson
• The anamorphic universe
• Cosmic Acceleration and the String Coupling
• Effective theory approach to brane world black holes
• Robustness of slow contraction to cosmic initial conditions
• Ekpyrotic loop quantum cosmology
• Adiabatic and entropy perturbations propagation in a bouncing Universe
• Gauss-Bonnet modified gravity models with bouncing behavior
• Nonlocal braneworld action: an alternative to Kaluza-Klein description
• Inflationary Theory versus Ekpyrotic/Cyclic Scenario
• Kantowski-Sachs Einstein-Aether Scalar Field Cosmological Models
• Constraints on Primordial Magnetic Fields from Inflation
• Bouncing Universe from Nothing
• Cosmological Perturbations on a Bouncing Brane
• Classical Inflationary and Ekpyrotic Universes in the No-Boundary Wavefunction
• Non-singular Power-law and Assisted inflation in Loop Quantum Cosmology
• Cosmology of the Spinor Emergent Universe and Scale-invariant Perturbations
• Bouncing Negative-Tension Branes
• Light propagation in inhomogeneous and anisotropic cosmologies
• Anisotropic Pressures at Ultra-stiff Singularities and the Stability of Cyclic Universes
• Kink scattering in a hybrid model
• Can black holes be torn up by phantom dark energy in cyclic cosmology?
• Asymptotic behavior of a scalar field with an arbitrary potential trapped on a Randall-Sundrum's braneworld: the effect of a negative dark radiation term on a Bianchi I brane
• Cosmological consequences of a principle of finite amplitudes
• Moving Five-Branes in Low-Energy Heterotic M-Theory
• Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
• Consistent Scalar and Tensor Perturbation Power Spectra in Single Fluid Matter Bounce with Dark Energy Era
• Five-Branes in Heterotic Brane-World Theories
• Pre-inflation and Trans-Planckian Censorship
• On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies
• Cosmological Perturbations Across an S-brane
• Cosmology with exponential potentials
• Curved 11D Supergeometry
• Emergent Universe from Energy-Momentum Squared Gravity
• Reconstruction of a Nonminimal Coupling Theory with Scale-invariant Power Spectrum
• Systematics of Adiabatic Modes: Flat Universes
• Islands in the Lambda-sea: An alternative cosmological model
• Theoretical Aspects of Quintom Models
• Collision of two kinks with inner structure
• ICTP Lectures on Large Extra Dimensions
• General Slow-Roll Spectrum for Gravitational Waves
• Fermi-bounce cosmology and the fermion curvaton mechanism
• Construction of nonsingular cosmological solutions in string theories
• Hamiltonian formalism for cosmological perturbations: the separate-universe approach
• Quotients of AdS_{p+1} x S^q: causally well-behaved spaces and black holes
• Gauge Five Brane Moduli In Four-Dimensional Heterotic Models
• Converting entropy to curvature perturbations after a cosmic bounce
• Adiabatic Spectra During Slowly Evolving
• Higher order derivative coupling to gravity and its cosmological implications
• Perturbations in a Bouncing Brane Model
• Primordial magnetic fields from a non-singular bouncing cosmology
• Loop Quantum Cosmology corrections to inflationary models
• Eternal Inflation, Entropy Bounds and the Swampland
• Primordial perturbations with pre-inflationary bounce
• Scalar tilt from broken conformal invariance
• On the Transfer of Metric Fluctuations when Extra Dimensions Bounce or Stabilize
• Effective Actions for Heterotic M-Theory
• The Polarization of the Cosmic Microwave Background Due to Primordial Gravitational Waves
• Bouncing cosmology in modified gravity with higher-order Gauss-Bonnet curvature term
• Gravitational Baryogenesis after Anisotropic Inflation
• The Scale-invariant Power Spectrum of Primordial Curvature Perturbation in CSTB Cosmos
• B-mode Detection with an Extended Planck Mission
• The conformal status of $\omega =-3/2$ Brans-Dicke cosmology
• Controlling Chaos through Compactification in Cosmological Models with a Collapsing Phase
• Brany Liouville Inflation
• When do colliding bubbles produce an expanding universe?
• Emergent universe in theories with natural UV cutoffs
• Sub-GeV galactic cosmic-ray antiprotons from primordial black holes in the Randall-Sundrum braneworld
• Null Energy Condition Violation and Classical Stability in the Bianchi I Metric
• Viable tensor-to-scalar ratio in a symmetric matter bounce
• Anomalies in the CMB from a cosmic bounce
• Collision of Domain Walls in asymptotically Anti de Sitter spacetime
• Solution of a Braneworld Big Crunch/Big Bang Cosmology
• Brane Big-Bang Brought by Bulk Bubble
• Bounce in GR and higher-order derivative operators
• Bounce and cyclic cosmology in new gravitational scalar-tensor theories
• Scalar perturbations in conformal rolling scenario with intermediate stage
• Features in the primordial power spectrum: constraints from the CMB and the limitation of the 2dF and SDSS redshift surveys to detect them
• Principal Component Analysis of the Cosmic Microwave Background Anisotropies: Revealing The Tensor Degeneracy
• Recollapsing quantum cosmologies and the question of entropy
• Cosmological Rescaling through Warped Space
• Searching for a matter bounce cosmology with low redshift observations
• On the Creation of the Universe via Ekpyrotic Instantons
• Cyclic Inflation
• Non-Singular Bounces Catalysed by Dark Energy
• Toward inflation models compatible with the no-boundary proposal
• Emergent Cosmology from Quantum Gravity in the Lorentzian Barrett-Crane Tensorial Group Field Theory Model
• A Cyclic Universe With Varying Cosmological Constant in $f(R,T)$ gravity
• Infinity in string cosmology: A review through open problems
• Decoherence out of fire: Purity loss in expanding and contracting universes
• Energy Conditions in Jordan Frame
• Past incompleteness of a bouncing multiverse
• Cosmological density perturbations from perturbed couplings
• The role of fluctuation-dissipation dynamics in setting initial conditions for inflation
• Five-Brane Dynamics and Inflation in Heterotic M-Theory
• Cyclic cosmology in modified gravity
• Current observations with a decaying cosmological constant allow for chaotic cyclic cosmology
• Scale Invariance via a Phase of Slow Expansion
• The Return of the Phoenix Universe
• Dark matter in a bouncing universe
• Born Again Universe
• Experimental Search for Quantum Gravity
• K-Bounce
• Constraining $F(R)$ bouncing cosmologies with primordial black holes
• Unconventional Cosmology
• Covariant c-flation: a variational approach
• Baryogenesis by Brane-Collision
• The Asymptotic Behavior of Bouncing Cosmological Models in $F(\mathcal{G})$ Gravity Theory
• Early Universe Dynamics in Semi-Classical Loop Quantum Cosmology
• Weakly non-Gaussian formula for the Minkowski functionals in general dimensions
• On ekpyrotic brane collisions
• Fluctuations in a Cosmology with a Space-Like Singularity and their Gauge Theory Dual Description
• Quantum Circuit Complexity of Primordial Perturbations
• Emergent universe scenario and the low CMB multipoles
• Kink-antikink collisions in the ${\varphi }^8$ model: short-range to long-range journey
• Cosmology at the top of the ${\alpha }^{\prime }$ tower
• Generating scale-invariant tensor perturbations in the non-inflationary universe
• A Braneworld Dark Energy Model with Induced Gravity and the Gauss-Bonnet Effect
• On the Transfer of Adiabatic Fluctuations through a Nonsingular Cosmological Bounce
• Primordial non-Gaussianities of scalar and tensor perturbations in general bounce cosmology: Evading the no-go theorem
• Interacting New Agegraphic Dark Energy in a Cyclic Universe
• What if Time Really Exists?
• Magnetogenesis in bouncing cosmology
• Bouncing and cyclic string gas cosmologies
• Bouncing models with a cosmological constant
• The slow expansion with nonminimal derivative coupling and its conformal dual
• CMB B-mode non-Gaussianity: optimal bispectrum estimator and Fisher forecasts
• Fuzzy Euclidean wormholes in de Sitter space
• Scalar Multiplet Dark Matter in a Fast Expanding Universe: resurrection of the desert region
• Dynamical Casimir effect for gravitons in bouncing braneworlds
• Inverse volume corrections to emergent tachyonic inflation in loop quantum cosmology
• Bounce and cyclic cosmology in weakly broken galileon theories
• Loop inflection-point inflation
• Classical Propagation of Strings across a Big Crunch/Big Bang Singularity
• Einstein static Universe in non-minimal kinetic coupled gravity
• keV Neutrino Dark Matter in a Fast Expanding Universe
• Pre-inflationary genesis with CMB B-mode polarization
• Back-reaction of Cosmological Fluctuations during Power-Law Inflation
• Quantum Transitions Through Cosmological Singularities
• Implication of GW170817 for cosmological bounces
• Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
• Non-singular bounce transitions in the multiverse
• Observational signatures of a non-singular bouncing cosmology
• Stability of the Einstein Static Universe in $4D$ Gauss-Bonnet Gravity
• False vacuum decay in kink scattering
• Effective Dark Energy Models and Dark Energy Models with Bounce in frames of $F(T)$ Gravity
• Primordial Gravitational Waves Induced by Magnetic Fields in an Ekpyrotic Scenario
• The Moduli of Reducible Vector Bundles
• Supersymmetric Sneutrino-Higgs Inflation
• DBI Inflation in N=1 Supergravity
• The Non-Minimal Ekpyrotic Trispectrum
• A Back-reaction Induced Lower Bound on the Tensor-to-Scalar Ratio
• Cosmic bubble and domain wall instabilities II: Fracturing of colliding walls
• Primordial features from ekpyrotic bounces
• Kink-antikink collisions for twin models
• Scale-free primordial cosmology
• On the Instability of the Lee-Wick Bounce
• Quantum Mixmaster as a model of the Primordial Universe
• Cosmological Dependence of Resonantly Produced Sterile Neutrinos
• Role of trans-Planckian modes in cosmology
• Kinky Brane Worlds
• The de Broglie-Bohm Quantum Theory and its Application to Quantum Cosmology
• Braneworld Cosmology and Holography
• Quasinormal modes in kink excitations and kink-antikink interactions: a toy model
• A stable flat universe with variable Cosmological constant in f(R,T) Gravity
• Quantum gravitational corrections to black hole geometries
• Status Report on Global Pulsar-Timing-Array Efforts to Detect Gravitational Waves
• Local non-Gaussianity in the Cosmic Microwave Background the Bayesian way
• Realistic Cyclic Magnetic Universe
• Particle Production in Ekpyrotic Scenarios
• Quantum Cosmological Perturbations of Multiple Fluids
• Spectrum of Cuscuton Bounce
• A Braneworld Universe From Colliding Bubbles
• Cosmological Perturbations Generated in the Colliding Bubble Braneworld Universe
• String creation in cosmologies with a varying dilaton
• Observational consequences of Bianchi I spacetimes in loop quantum cosmology
• Cosmological matching conditions
• Observation of Discrete Oscillations in a Model-independent Plot of Cosmological Scale Factor vs. Lookback Time and a Scalar Field Model
• Generalised perturbation equations in bouncing cosmologies
• Degenerate vacua to vacuumless model and $K\bar{K}$ collisions
• Effective action for the homogeneous radion in brane cosmology
• No-boundary measure and preference for large e-foldings in multi-field inflation
• The curvaton as a Bose-Einstein condensate of chiral pseudo Nambu-Goldstone bosons
• Magnetogenesis in Matter - Ekpyrotic Bouncing Cosmology
• A comment on bouncing and cyclic branes in more than one extra-dimension
• Naturalness in Cosmological Initial Conditions
• Superbounce and Loop Quantum Ekpyrotic Cosmologies from Modified Gravity: $F(R)$, $F(G)$ and $F(T)$ Theories
• The Challenging Cosmic Singularity
• Dynamics of colliding branes and black brane production
• Brane Decay from the Origin of Time
• Nonsingular Cosmology from an Interacting Vacuum
• Stability of Einstein static universe in gravity theory with a non-minimal derivative coupling
• Identification of perturbation modes and controversies in ekpyrotic perturbations
• No evidence for the blue-tilted power spectrum of relic gravitational waves
• New Ekpyrotic Quantum Cosmology
• The Confining Heterotic Brane Gas: A Non-Inflationary Solution to the Entropy and Horizon Problems of Standard Cosmology
• Balancing the vacuum energy in heterotic $M$-theory
• Primordial Perturbations During a Slow Expansion
• Perturbative Anti-Brane Potentials in Heterotic M-theory
• Perturbations in a regular bouncing Universe
• Ekpyrotic universes in $F(R)$ Hořava-Lifshitz gravity
• Parity-violation in bouncing cosmology
• Arrows of Time in the Bouncing Universes of the No-boundary Quantum State
• Testing braneworlds with the binary pulsar
• Fractional-Wrapped Branes with Rotation, Linear Motion and Background Fields
• Causal Structure and Gravitational Waves in Brane World Cosmology
• On the stability of Einstein static universe at background level in massive bigravity
• Conformal relativity versus Brans-Dicke and superstring theories
• $f(R)$-Modified Gravity, Wald Entropy, and the Generalized Uncertainty Principle
• Primordial Features as Evidence for Inflation
• Bouncing pre-big bang on the brane
• Mimicking alternatives to inflation with interacting spectator fields
• Stability of Hyperbolic and Matter-Dominated Bounce Cosmologies From F(R,G) Modified Gravity at Late Evolution Stages
• Bouncing and cyclic universes in the charged AdS bulk background
• Search for passing-through-walls neutrons constrains hidden braneworlds
• The phase portrait of a matter bounce in Horava-Lifshitz cosmology
• A World-Volume Perspective on the Recombination of Intersecting Branes
• Braneworld effective action and origin of inflation
• Primordial power spectrum from a matter-Ekpyrotic bounce scenario in loop quantum cosmology
• Lyth bound revisited
• Stability of the Einstein static Universe in Einstein-Cartan-Brans-Dicke gravity
• String Propagation through a Big Crunch/Big Bang Transition
• Probing neutron-hidden neutron transitions with the MURMUR experiment
• Evading the theoretical no-go theorem for nonsingular bounces in Horndeski/Galileon cosmology
• Diversity in the Phoenix Universe
• Cosmological perturbations in the 5D Big Bang
• Cyclic Magnetic Universe
• Unitarity Bound on Dark Matter in Low-temperature Reheating Scenarios
• The Big Bang and the Quantum
• Is Vacuum Decay Significant in Ekpyrotic and Cyclic Models?
• Mimetic Inflation
• Non-Canonical Inflation in Supergravity
• Conformal symmetry of brane world effective actions
• Unavoidable shear from quantum fluctuations in contracting cosmologies
• The Inflationary Gravity Waves in light of recent Cosmic Microwave Background Anisotropies data
• Dynamical Selection of the Primordial Density Fluctuation Amplitude
• Sourcing curvature modes with entropy perturbations in non-singular bouncing cosmologies
• Massive gravity and the suppression of anisotropies and gravitational waves in a matter-dominated contracting universe
• Birth of baby universes from gravitational collapse in a modified-gravity scenario
• Brane-world cosmology
• Little String Theories in Heterotic Backgrounds
• Probing the origin of our universe through primordial gravitational waves by Ali CMB project
• Emergent Universe Scenario, Bouncing and Cyclic Universes in Degenerate Massive Gravity
• The Physical World as a Virtual Reality
• Expanding space, quasars and St. Augustine's fireworks
• Testing and selection of cosmological models with $(1+z{)}^6$ corrections
• Smooth Singularities Exposed: Chimeras of the Differential Spacetime Manifold
• Stringy corrections to a time-dependent background solution of string and M-Theory
• $f(T)$ cosmology: From Pseudo-Bang to Pseudo-Rip
• Asymptotic vacua with higher derivatives
• The Effects of Multiple Modes and Reduced Symmetry on the Rapidity and Robustness of Slow Contraction
• Mathematical General Relativity
• Colliding branes and big crunches
• Strong Coupling Problem with Time-Varying Sound Speed
• Ectoplasm with an Edge
• Loop quantum cosmology: relation between theory and observations
• Five-Dimensional Moving Brane Solutions with Four-Dimensional Limiting Behaviour
• Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
• Asymptotic analysis of spatially inhomogeneous stiff and ultra-stiff cosmologies
• Equivalent off-diagonal cosmological models and ekpyrotic scenarios in f(R)-modified, massive and Einstein gravity
• Beyond the Low Energy Approximation in Braneworld Cosmology
• Instanton Moduli in String Theory
• Stable, non-singular bouncing universe with only a scalar mode
• Pre-Big-Bang Cosmology and Circles in the Cosmic Microwave Background
• Phantom Behavior Bounce with Tachyon and Non-minimal Derivative Coupling
• Perturbations in a Holographic Universe and in Other Stiff Fluid Cosmologies
• $f(\mathcal{G},\text{T})$ Gravity Bouncing Universe with Cosmological Parameters
• Periodic Cosmological Evolutions of Equation of State for Dark Energy
• Chaplygin inflation in loop quantum cosmology
• Tunnelling and dynamical violation of the Null Energy Condition
• Fluctuations through a Vibrating Bounce
• The dynamics of scalar-tensor cosmology from RS two-brane model
• Is Bianchi I a Bouncing Cosmology in the Wheeler-DeWitt picture?
• A Classical Treatment of Island Cosmology
• Two 3-Branes in Randall-Sundrum Setup and Current Acceleration of the Universe
• Optimal Inflationary Potentials
• What kind of science is cosmology?
• Matter localization and resonant deconfinement in a two-sheeted spacetime
• Further Refining Swampland dS Conjecture in Mimetic f(G) Gravity
• Non-linear vector perturbations in a contracting universe
• Topological Gravity as the Early Phase of Our Universe
• Braneworld Kaluza-Klein Corrections in a Nutshell
• Newtonian Potential and Geodesic Completeness in Infinite Derivative Gravity
• A classical, non-singular, bouncing universe
• Dynamical brane with angles : Collision of the universes
• M-Theory Moduli Space and Cosmology
• Cosmology using numerical relativity
• Time before Time - Classifications of universes in contemporary cosmology, and how to avoid the antinomy of the beginning and eternity of the world
• Effective theory for close limit of two branes
• On the Big Bounce Singularity of a Simple 5D Cosmological Model
• The simplest possible bouncing quantum cosmological model
• Minimizing the tensor-to-scalar ratio in single-field inflation models
• Revisiting signatures of thermal axions in nonstandard cosmologies
• Cosmologies from higher-order string corrections
• Conflation: a new type of accelerated expansion
• Viable non-singular cosmic bounce in holonomy improved F(R) gravity endowed with a Lagrange multiplier
• A New Era in High-energy Physics
• Semi-compactness and multiple oscillating pulses in kink scattering
• Dynamic properties of cyclic cosmologies
• Issues in the Philosophy of Cosmology
• Arithmetic and Hyperbolic Structures in String Theory
• Quintessence and (Anti-)Chaplygin Gas in Loop Quantum Cosmology
• Constraints on Models with a Break in the Primordial Power Spectrum
• Fingerprints of a Non-Inflationary Universe from Massive Fields
• Double Higgs Production with a Jet Substructure Analysis to Probe Extra Dimensions
• Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
• D=5 M-theory radion supermultiplet dynamics
• Non-Gaussian CMB and LSS statistics beyond polyspectra
• Unified Dark Matter, Dark Energy and Baryogenesis via a "Cosmological Wetting Transition''
• Seeing through the cosmological bounce: Footprints of the contracting phase and luminosity distance in bouncing models
• The Universe Dynamics from Topological Considerations
• Non-minimally coupled varying constants quantum cosmologies
• Bianchi-I cosmologies, magnetic fields and singularities
• Scale Factor Duality for Conformal Cyclic Cosmologies
• Early universe in view of a modified theory of gravity
• Bouncing universe of entropy-corrected Friedmann equations
• Bouncing cosmology from nonlinear dark energy with two cosmological constants
• Kähler moduli inflation and WMAP7
• Contracting Cosmologies and the Swampland
• Probing signatures of bounce inflation with current observations
• Keeping an Eye on DBI: Power-counting for small-$c_s$ Cosmology
• The Inflationary Energy Scale in Braneworld Cosmology
• Lensed Density Perturbations in Braneworlds: An Alternative to Perturbations from Inflation
• Mimicking inflation with 2-fluid systems in a strong gradient magnetic field
• Cyclic multiverses
• Principles, Progress and Problems in Inflationary Cosmology
• On the initial singularity in Kantowski-Sachs spacetime
• Chaplygin Gas Hořava-Lifshitz Quantum Cosmology
• Can Back-Reaction Prevent Eternal Inflation?
• Quantum and classical cosmology in the Brans-Dicke theory
• Holographic Curvature Perturbations in a Cosmology with a Space-Like Singularity
• Bouncing Cosmological Isotropic Solutions in Scalar-Tensor Gravity
• The fermion spectrum in braneworld collisions
• Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
• Causality and the Arrow of Time in the Branch-Cut Cosmology
• The Tilt of Primordial Gravitational Waves Spectra from BICEP2
• Evolution of linear perturbations through a bouncing world model: Is the near Harrison-Zel'dovich spectrum possible via a bounce?
• On the Validity of a Factorizable Metric Ansatz in String Cosmology
• Corrections to Newton's law of gravitation in the context of codimension-1 warped thick braneworlds
• Sub-GeV-scale signatures of hidden braneworlds up to the Planck scale in a $SO(3,1)$-broken bulk
• Superluminal Propagation on a Moving Braneworld
• Goldilocks Models of Higher-Dimensional Inflation (including modulus stabilization)
• Low-energy effective theory for a Randall-Sundrum scenario with a moving bulk brane
• Cosmological Consequences of Domain Walls Biased by Quantum Gravity
• Large classical universes emerging from quantum cosmology
• A comment on $p$-branes of ($p+3$)$\mathrm{d}$ string theory
• Probing local non-Gaussianities within a Bayesian framework
• Vector perturbations in bouncing cosmology
• The CST Bounce Universe model -- a parametric study
• Non-singular Cyclic Cosmology without Phantom Menace
• Stochastic collapse
• Gauges in the bulk
• Knot Universes in Bianchi Type I Cosmology
• Global structure of the multiverse and the measure problem
• Gauge Five Brane Dynamics And Small Instanton Transitions In Heterotic Models
• Thermal Fluctuations of Dark Matter in Bouncing Cosmology
• The Measure for the Multiverse and the Probability for Inflation
• Fermions on wobbling kinks: normal versus quasinormal modes
• General background conditions for K-bounce and adiabaticity
• From Big Crunch to Big Bang: A Quantum String Cosmology Perspective
• Probing Particle Physics from Top Down with Cosmic Strings
• Initial Energy of a Spatially Flat Universe -- a Hint of its Possible Origin
• String Theory and The Arrow of Time
• Birth of de Sitter Universe from time crystal
• Probing the origin of our Universe through cosmic microwave background constraints on gravitational waves
• Emergent scenario in mimetic gravity
• New developments on embedding inflation in gauge theory and particle physics
• Dark matter and baryogenesis in the Fermi-bounce curvaton mechanism
• On Quantum Simulation Of Cosmic Inflation
• Dynamics of Cosmological Perturbations and Reheating in the Anamorphic Universe
• Effect of intermediate Minkowskian evolution on CMB bispectrum
• The string wave function across a Kasner singularity
• Reheating constraints on mutated hilltop inflation
• Cosmic No Hair for Collapsing Universes
• Perturbations in Bouncing and Cyclic Models, a General Study
• Distinguishing cosmological models through quantum signatures of primordial perturbations
• Quantum Fluctuations in Cosmology and How They Lead to a Multiverse
• Emergence of multiverse in third quantized varying constants cosmologies
• Conserved cosmological perturbations in USR inflation and bouncing scenarios
• Universal properties of the evolution of the Universe in modified loop quantum cosmology
• Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce
• Observational constraints on anisotropies for bouncing alternatives to inflation
• Towards conformal cosmology
• Reconstruction of the equation of state for the cyclic universes in homogeneous and isotropic cosmology
• Non-singular model universe from a perfect fluid scalar-metric cosmology
• Pre-inflation from the multiverse: Can it solve the quadrupole problem in the cosmic microwave background?
• Universe scenarios from loop quantum cosmology
• Modern Cosmology, an Amuse-Gueule
• Low Energy Effective Action for Horava-Witten Cosmology
• Magnetogenesis in Cyclical Universe
• Emergence of a Cyclic Universe from the Hagedorn Soup
• Stable Singularity-free Cosmological Solutions in non-projectable Horava-Lifshitz Gravity
• Scalar warm inflation in holographic cosmology
• Oscillating scalar fields in extended quintessence
• How Slowly can the Early Universe Expand?
• Decoherence Problem in Ekpyrotic Phase
• Bayesian naturalness, simplicity, and testability applied to the $B-L$ MSSM GUT
• Primordial Gravitational Waves Measurements and Anisotropies of CMB Polarization Rotation
• Towards an Observational Appraisal of String Cosmology
• Running of the Spectral index in Deformed Matter Bounce Scenarios with Hubble-rate-dependent Dark Energy
• Flow in Cyclic Cosmology
• Bispectrum Islands
• AdS/CFT on the brane
• Thermally Producing and Weakly Freezing-out Dark Matter in Bouncing Universe
• Pre-big bang on the brane
• Qualitative study in Loop Quantum Cosmology
• Duality of boundary value problems and braneworld action in curved brane models
• Back-Reaction of Gravitational Waves Revisited
• Probing the Primordial Universe using Massive Fields
• Evolution of black holes through a nonsingular cosmological bounce
• On the chaos of D-brane phase transitions
• Braneworld Flux Inflation
• Limitations of an Effective Field Theory Treatment of Early Universe Cosmology
• High-Energy theory for close Randall Sundrum branes
• Cyclic Cosmology from the Little Rip
• Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
• Interpreting Pulsar Timing Array data of Gravitational Waves with Ekpyrosis-Bouncing Cosmology
• Gauges in the Bulk II: Models with Bulk Scalars
• Laser frequency combs and ultracold neutrons to probe braneworlds through induced matter swapping between branes
• Big Bounce Baryogenesis
• The Quantum Origin of Quasi de Sitter: a Model Independent Quantum Cosmological Tilt
• High-energy effective theory for matter on close Randall Sundrum branes
• Dilaton stabilization and composite dark matter in the string frame of heterotic-M-theory
• Entropic issues in contemporary cosmology
• The Relative Motion of Membranes
• Anisotropic Bouncing Scenario in $F(X)-V(\varphi )$ model
• Graviton production from extra dimensions
• Non-Standard Primordial Clocks from Dynamical Mass in Alternative to Inflation Scenarios
• Moduli and Graviton Production during Moduli Stabilization
• Numerical Relativity Beyond Astrophysics
• A primer on the ekpyrotic scenario
• Inflation driven by q-de Sitter
• Rotational inhomogeneities from pre-big bang?
• Canonical equivalence, quantization and anisotropic inflation in higher order theory of gravity
• Loop Quantum Cosmology: Physics of Singularity Resolution and its Implications
• Slinky evolution of domain wall brane cosmology
• Super Heavy Dark Matter Anisotropies from D-particles in the Early Universe
• Moving Five-Branes and Membrane Instantons in Low Energy Heterotic M-Theory
• Isochronous Cosmologies
• Topological defects: A problem for cyclic universes?
• Cosmic bounce and phantom-like equation of state from tunnelling
• CMB power spectrum for emergent scenario and slow expansion in scalar-tensor theory of gravity
• Inflationary Cosmology: Theory and Phenomenology
• Bose-Einstein condensation as an alternative to inflation
• Nonlinear Resonance in Hořava-Lifshitz Bouncing Cosmologies
• Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe
• Supergravitational Conformal Galileons
• Parity-violating primordial gravitational waves from null energy condition violation
• Regular Friedmann Universes and Matter Transformations
• Emergent universe revisited through the CSL theory
• Hořava-Lifshitz Bouncing Bianchi IX Universes: A Dynamical System Analysis
• Can neutron disappearance/reappearance experiments definitively rule out the existence of hidden braneworlds endowed with a copy of the Standard Model?
• Dynamics of Charged Events
• Bouncing and inflationary dynamics in quantum cosmology in the de Broglie-Bohm interpretation
• What if? - Exploring the Multiverse through Euclidean wormholes
• Testing time-delayed cosmology
• Future soft singularities, Born-Infeld-like fields and particles
• On Inflation and Variation of the Strong Coupling Constant
• Saving the universe with finite volume effects
• Tilted Ekpyrosis
• A Bouncing Cosmology from VECROs
• Universal scattering laws for quiescent bouncing cosmology
• Brane-Worlds and the Calabi-Yau Complex Structure Moduli
• Cosmological Time Crystals From Einstein-Cubic Gravities
• Note on Dark Energy and Cosmic Transit in a scale-invariance cosmology
• Dynamical vs spectator models of (pseudo-)conformal Universe
• Hamiltonian formalism for cosmological perturbations: fixing the gauge
• The emergence of the physical world from information processing
• The Hubble tension from the standpoint of quantum cosmology
• Bouncing universes and their perturbations : a simple model revisited
• Cosmological Solutions of Low-Energy Heterotic M-Theory
• One-loop tunnelling-induced energetics
• Cosmological Perturbations without Inflation
• Non-local Matching Condition and Scale-invariant Spectrum in Bouncing Cosmology
• Emergent universe: tensor perturbations within the CSL framework
• Quantum gravity and gravitational-wave astronomy
• Early-universe cosmology in Einstein-scalar-Gauss-Bonnet gravity
• Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization
• Classical and Quantum Causality in Quantum Field Theory. Or, "The Quantum Universe"
• Consistency of Anisotropic Inflation during Rapid Oscillations with Planck 2015 Data
• A maximal-entropy initial state of the Universe as a microscopic description of inflation
• $C$-field cosmological models: revisited
• Are black holes in an ekpyrotic phase possible?
• Time-dependent toroidal compactification proposals and the Bianchi type II model: classical and quantum solutions
• Geometric phases and cyclic isotropic cosmologies
• Isochronous Spacetimes
• Crossing the Big Bang singularity
• Cyclic spacetimes through singularity scattering maps. The laws of quiescent bounces
• Warm and Cold Dark Matter in Bouncing Universe
• Aspects of String Cosmology
• Complexity and the Big Bang
• Power spectrum and anisotropy of super inflation in loop quantum cosmology
• Perturbations in Symmetric Lee-Wick Bouncing Universe
• Attractor Solutions in Tachyacoustic Cosmology
• Non-Gaussian signatures of Tachyacoustic Cosmology
• On the Regularizability of the Big Bang Singularity
• What we don't know about time
• Probing symmetric teleparallel gravity in the early universe
• On the EFT of Conformal Symmetry Breaking
• Bound to bounce: a coupled scalar-tachyon model for a smooth bouncing/cyclic universe
• $f(R)$ Gravity and Crossing the Phantom Divide Barrier
• Non-singular flat universes in braneworld and Loop Quantum Cosmology
• Relic gravitons and pulsar timing arrays: a theoretical viewpoint
• The Cosmological Slingshot Scenario: Myths and Facts
• The Low Energy Effective Equations of Motion for Multibrane World Gravity
• Can quantum gravity be both consistent and complete?
• High-energy effective theory for a bulk brane
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• The Stability of Branonium
• Colliding Branes and Formation of Spacetime Singularities
• Finitary, Causal and Quantal Vacuum Einstein Gravity
• On the difficulty of generating gravitational wave turbulence in the early universe
• Holographic 2-Point Functions in the Pseudo-Conformal Universe
• Tunnelling-induced cosmic bounce in the presence of anisotropies
• Casimir effect between moving branes
• Transitioning from a bounce to $R^2$ inflation
• Numerically Investigating the Emergent Cyclic Inflation Scenario
• Quantum Space-times: Beyond the Continuum of Minkowski and Einstein
• Gravity is controlled by cosmological constant
• SuperCool Inflation: A Graceful Exit from Eternal Inflation at LHC Scales and Below
• Isotropization in Chaplygin matter universes connected by a wormhole
• Gravitational diffraction radiation
• The Dynamics of Brane-World Cosmological Models
• Investigation into Compactified Dimensions: Casimir Energies and Phenomenological Aspects
• Colliding branes and formation of spacetime singularities in string theory
• Signal photon flux generated by high-frequency relic gravitational waves
• Nonsingular Cosmology from an Unstable Higgs Field
• Holographic Cosmology from a System of M2-M5 Branes
• Numerical Solution of the Ekpyrotic Scenario in the Moduli Space Approximation
• Mini Black Holes and the Relic Gravitational Waves Spectrum
• Bounce scenarios in the Sotiriou-Visser-Weinfurtner generalization of the projectable Horava-Lifshitz gravity
• "All that matter ... in one Big Bang ...," & other cosmological singularities
• Variations of the Fine Structure Constant in Space and Time
• Intersecting hypersurfaces and Lovelock Gravity
• Reconstructing inflationary potential from NANOGrav 15-year Data: A robust study using Non-Bunch Davies initial condition
• Five-dimensional warped product space-time with time-dependent warp factor and cosmology of the four-dimensional universe
• Cosmological Singularity and Power-Law Solutions in Modified Gravity
• Quantum corrections to the kinetic term in the Randall-Sundrum model
• Strength of singularities in varying constants theories
• Notes on the post-bounce background dynamics in bouncing cosmologies
• Sequestering Mechanism in Scalar-Tensor Gravity
• High-energy effective theory for orbifold branes
• Universe bouncing its way to inflation
• Theory of Cosmological Perturbations and Applications to Superstring Cosmology
• AdS cycles in eternally inflating background
• Covariant perturbations through a simple non-singular bounce
• Brane Bounce from logarithmic entropic corrections in the bulk
• Detailed analysis of the curvature bounce: background dynamics and imprints in the CMB
• Geodesically complete cyclic cosmologies and entropy
• Imprints of Anisotropy on the Power Spectrum in Matter Dominated Bouncing Universe as Background
• Ekpyrosis and inflationary dynamics in heavy ion collisions: the role of quantum fluctuations
• Vacuum Polarization in an Anti-de Sitter Space as an Origin for a Cosmological Constant in a Brane World
• Approximate Likelihood Approaches for Detecting the Influence of Primordial Gravitational Waves in Cosmic Microwave Background Polarization
• A dark radiation era prior to the inflationary phase
• Constraining matter-bounce scenario from scalar-induced vector perturbations
• Torsion braneworlds in a tensor-vector gravity
• Adiabatic Duality: Duality of cosmological models with varying slow-roll parameter and sound speed
• Probing Primordial Symmetry Breaking with Cosmic Microwave Background Anisotropy
• A Cosmological Model of Holographic Brane Gravity
• Strong coupling and instabilities in singularity-free inflation from an infinite sum of curvature corrections
• De Sitter Bounces
• BPS brane cosmology in N=2 supergravity
• Instability of the Time Dependent Horava-Witten Model
• Towards degeneracy breaking of early universe models
• Smoking-gun signatures of bounce cosmology from echoes of relic gravitational waves
• Violation of C/CP Symmetry Induced by a Scalar Field Emerging from a Two-Brane Universe: A Gateway to Baryogenesis
• Entanglement entropy of cosmological perturbations for S-brane Ekpyrosis
• String theory and primordial cosmology
• Anisotropic multiple bounce models
• Curvaton mechanism and its implications to sneutrino cosmology
• The four-dimensional null energy condition as a swampland conjecture
• Unifying turnaround-bounce cosmology in a cyclic universe considering a running vacuum model
• Conformal matter in warped backgrounds
• Falsifying Tree Level String Motivated Bouncing Cosmologies
• Probability of the Initial Conditions for Inflation and Slow Contraction
• Non-BPS D9-branes in the Early Universe
• Cosmological Singularities in Brane Gravity
• Gravity and Large Extra Dimensions
• String theory: an update
• Ekpyrosis in Quantum Gravitational Anisotropic Bouncing Models
• Is it possible to separate baryonic from dark matter within the $\Lambda$-CDM formalism?
• Supporting Abstract Relational Space-Time as Fundamental without Doctrinism against Emergence
• Solitonic Brane Inflation
• Metric Expansion from Microscopic Dynamics in an Inhomogeneous Universe
• On black holes in heterotic braneworlds
• Unification, the Big Bang, and the Cosmological Constant
• Long-wavelength approximation for string cosmology with barotropic perfect fluid
• (P)reheating Effects of the Kähler Moduli Inflation I Model
• An "Ultrasonic Image" of the Embryonic Universe: CMB Polarization Tests of the Inflationary Paradigm
• Adiabatic fluctuations from cosmic strings in a contracting universe
• On the four-dimensional effective theories in brane-worlds
• Quasi-matter Bounce Cosmology in Light of Planck
• Gravitational Leptogenesis in Bounce Cosmology
• Cosmology on Compact and Stable Supergravity Background
• Topological Ghosts: the Teeming of the Shrews
• Pseudo-conformal Universe: late-time contraction and generation of tensor modes
• Isochronous solutions of Einstein's equations and their Newtonian limit
• Before the Bang
• Dynamics of scalar fields in an expanding/contracting cosmos at finite temperature
• Does History Repeat Itself? Periodic Time Cosmology
• Search for neutron-hidden neutron interbrane transitions with MURMUR, a low-noise neutron passing-through-walls experiment
• Bounds on ortho-positronium and $J/\psi$-${\rm Y}$ quarkonia invisible decays and constraints on hidden braneworlds in a $SO(3,1)$-broken 5D bulk
• Space-time singularities and the theory of retracts
• Following the density perturbations through a bounce with AdS/CFT Correspondence
• Cosmological backreaction of heavy string states
• Anisotropic Cyclic Universe in $F(X)-V(\varphi )$ model
• PhD Thesis: String theory in the early universe
• Particle Astrophysics and Cosmology: Cosmic Laboratories for New Physics (Summary of the Snowmass 2001 P4 Working Group)
• Origin & evolution of the Universe
• Conservation laws for colliding branes with induced gravity
• Conformal structure of singularities in some varying fundamental constants bimetric cosmologies
• de Sitter Excited State in Heterotic E_8 x E_8 Theory
• Conformally coupled inflation
• Stellar Light Scattering as a Probe for a Braneworld-Induced Baryogenesis Scenario
• Looking Beyond Inflationary Cosmology
• Thermodynamics of Apparent Horizon and Friedmann Equations in Big Bounce Universe
• Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link
• Finite time pseudo-rip singularity in cosmology
• Primordial Fluctuations in String Cosmology
• Quantum Creation of a Toy Universe without Inflation
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Geodesically Complete Curvature-Bounce Inflation
• Breaking Free from the Swampland of Impossible Universes through the DESI Portal
• The String Coupling Accelerates the Expansion of the Universe
• Scale-Invariant Bounce Cosmology in Weyl f(Q) Gravity with Quintom Signature
• RRR fluctuations from non-singular bounce
• Uniformity of Cosmic Microwave Background as a Non-Inflationary Geometrical Effect
• Falsifiability of Isolated Spacetime Regions
• Cosmology in a Globally U(1) Symmetric Scalar-Tensor Gravity
• Einstein, tea leaves, meandering rivers, and the origin of supermassive black holes in ekpyrotic universe
• Bounce inflation driven by Higgs field
• Fractional Dp-Branes with Transverse and Tangential Dynamics in the Presence of Background Fluxes
• Cosmological Asymptotics in Higher-Order Gravity Theories
• The Darboux Transformation and Exactly Solvable Cosmological Models
• The CMB bispectrum from bouncing cosmologies
• Entropy, Black holes, and the New Cyclic Universe
• Bayes' Theorem, Inflation, and the Ekpyrotic Universe
• Tricritical quantum point and inflationary cosmology
• Non-singular Bounce from a Phase transition
• Do We Live in a Vanilla Universe? Theoretical Perspectives on WMAP
• D-Brane Chemistry
• 5D non-symmetric gravity and geodesic confinement
• A new topological perspective of expanding space-times with applications to cosmology
• Serial Acceleration-Deceleration Transitions in a Cyclic Universe with Negative Curvature
• Notes on quantum evolution across singularities
• Interaction of the branes in the Presence of the Background Fields: the Dynamical Non-intersecting Perpendicular Wrapped-Fractional Configuration
• I've Got the World on a Brane