Monodromy in the CMB: Gravity Waves and String Inflation

Abstract

We present a simple mechanism for obtaining large-field inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori. For Nil manifolds, we obtain a leading inflationary potential proportional to phi^(2/3) in terms of the canonically normalized field phi, yielding predictions for the tilt of the power spectrum and the tensor-to-scalar ratio, $n_s\approx 0.98$ and $r\approx 0.04$ with 60 e-foldings of inflation; we note also the possibility of a variant with a candidate inflaton potential proportional to phi^(2/5). The basic mechanism involved in extending the field range -- monodromy in D-branes as they move in circles on the manifold -- arises in a more general class of compactifications, though our methods for controlling the corrections to the slow-roll parameters require additional symmetries.

43 pages, latex. 4 figures

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• Axion Periodicity and Coupling Quantization in the Presence of Mixing
• Gravitational waves from fermion production during axion inflation
• Slow-Roll Inflation in Scalar-Tensor Models
• Inflationary Predictions and Moduli Masses
• Study of Goldstone Inflation in the domain of Einstein-Gauss-Bonnet gravity
• Non-Gaussianities in models of inflation with large and negative entropic masses
• A no-go theorem for monodromy inflation
• Constraints on Early Dark Energy from the Axion Weak Gravity Conjecture
• Constraints and Horizons for de Sitter with Extra Dimensions
• Mass Hierarchy and Vacuum Energy
• Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales
• Spiral Inflation with Coleman-Weinberg Potential
• Towards Kaluza-Klein Dark Matter on Nilmanifolds
• Conformal Inflation Coupled to Matter
• The phenomenology of trapped inflation
• Gravitational Waves from Axion Monodromy
• Resonance instability of primordial gravitational waves during inflation in Chern-Simons gravity
• Mimicking alternatives to inflation with interacting spectator fields
• An Effective Field Theory for Large Oscillons
• Sudden braking and turning with a two-field potential bump: primordial black hole formation
• Reheating with a Composite Higgs
• Towards the fate of the oscillating false vacuum
• Chaotic Inflation in No-Scale Supergravity with String Inspired Moduli Stabilization
• Natural Inflation from Near Alignment in Heterotic String Theory
• Excursions through KK modes
• Issues in Complex Structure Moduli Inflation
• Completely Dark Matter from Rapid-Turn Multifield Inflation
• Slow-roll Extended Quintessence
• High-Quality Axions from Higher-Form Symmetries in Extra Dimensions
• Cosmological Probes of Structure Growth and Tests of Gravity
• Oscillons of Axion-Like Particle: Mass distribution and power spectrum
• On the Trispectrum of Galileon Inflation
• Chaotic inflation with curvaton induced running
• Gauged M-flation After BICEP2
• High-resolution CMB bispectrum estimator with flexible modal basis
• Kinetic Gravity Braiding and axion inflation
• New model of axion monodromy inflation and its cosmological implications
• The Inflated Chern-Simons Number in Spectator Chromo-Natural Inflation
• Chiral Anomaly in SU(2)${}_R$-Axion Inflation and the New Prediction for Particle Cosmology
• Primordial power spectrum features in phenomenological descriptions of inflation
• A Minimal Sub-Planckian Axion Inflation Model with Large Tensor-to-Scalar Ratio
• Tilt and Tensor-to-Scalar Ratio in Multifield Monodromy Inflation
• Revisiting the Minimal Chaotic Inflation Model
• Dark Matter in Axion Landscape
• Gauge and gravitational instantons: From 3-forms and fermions to Weak Gravity and flat axion potentials
• Low-scale Inflation and Supersymmetry Breaking in Racetrack Models
• Exploring ALPs beyond the canonical
• Non-topological solitons and quasi-solitons
• Revisiting pre-inflationary universe of family of $\alpha -$attractor in loop quantum cosmology
• Fine tuning and the ratio of tensor to scalar density fluctuations from cosmological inflation
• Effects of Light Fields During Inflation
• A note on Low Energy Effective Theory of Chromo Natural Inflation in the light of BICEP2 results
• Observational Consequences of a Landscape: Epilogue
• Fractional chaotic inflation in the lights of PLANCK and BICEP2
• Universality of linear perturbations in SU($N$)-natural inflation
• Constraining Cosmic Inflation with Observations: Prospects for 2030
• Cosmological Particle Production and Pairwise Hotspots on the CMB
• Oscillons during Dirac-Born-Infeld Preheating
• Leptogenesis in Cosmological Relaxation with Particle Production
• Post-inflationary Scalar Tensor Cosmology and Inflationary Parameters
• Chaotic inflation in supergravity and cosmic string production
• A Spinodal Solution to Swampland Inflationary Constraints
• Non-Minimal Braneworld Inflation after the Planck
• Gravitational waves detectable in laser interferometers from axion-SU(2) inflation
• Spinodal Instabilities and Super-Planckian Excursions in Natural Inflation
• Distinguishing between Extra Natural Inflation and Natural Inflation after BICEP2
• Gravitational Decoupling and Picard-Lefschetz
• Challenges for D-brane large-field inflation with stabilizer fields
• θ-angle monodromy in two dimensions
• Axion inflation with cross-correlated axion isocurvature perturbations
• Primordial non-Guassianity in inflation with gravitationally enhanced friction
• Probing Oscillons of Ultra-Light Axion-like Particle by 21cm Forest
• Conifold dynamics and axion monodromies
• Harmonic Hybrid Inflation
• Observational Constraints on Axions as Quintessence in String Theory
• Axion Experiments to Algebraic Geometry: Testing Quantum Gravity via the Weak Gravity Conjecture
• Can Back-Reaction Prevent Eternal Inflation?
• Large tensor mode, field range bound and consistency in generalized G-inflation
• Constraints on Brane-World Inflation from the CMB Power Spectrum: Revisited
• Explaining low l anomalies in the CMB power spectrum with resonant superstring excitations during inflation
• Gravitino Problem in Supergravity Chaotic Inflation and SUSY Breaking Scale after BICEP2
• Inflation as an Information Bottleneck - A strategy for identifying universality classes and making robust predictions
• Enhanced Preheating after Multi-Field Inflation: On the Importance of being Special
• Monodromy inflation and an emergent mechanism for stabilising the cosmological constant
• The Different Regimes of Axion Gauge Field Inflation
• Lyth Bound, eternal inflation and future cosmological missions
• Unified Model of Chaotic Inflation and Dynamical Supersymmetry Breaking
• Expectations for Inflationary Observables: Simple or Natural?
• Probing the Weak Gravity Conjecture in the Cosmic Microwave Background
• Chaotic Brane Inflation
• Study in the noncanonical domain of Goldstone inflation
• Axionic Festina Lente
• Reconciling tensor and scalar observables in G-inflation
• Axion RG flows and the holographic dynamics of instanton densities
• Poly-instanton axion inflation
• A Universal Bound on Excitations of Heavy Fields during Inflation
• Particle Production during Inflation in Light of PLANCK
• Present and future of CosmoLattice
• Introduction to the number of $e$-folds in slow-roll inflation
• Non-minimally assisted chaotic inflation
• Phases of Inflation
• Constraint on inflation model from BICEP2 and WMAP 9-year data
• Symmetry Breaking Indication for Supergravity Inflation in Light of the Planck 2015
• Reconstruction of $\alpha$-attractor supergravity models of inflation
• Scalar induced gravitational waves review
• Spontaneous Baryogenesis without Baryon Isocurvature
• The Effect of $\alpha$-Vacua on the Scalar and Tensor Spectral Indices: Slow-Roll Approximation
• The Power Spectrum of Density Perturbations in Chain Inflation
• Tensor modes on the string theory landscape
• Multi-chaotic inflation with and without spectator field
• Anisotropies in Cosmological 21 cm Background by Oscillons/I-balls of Ultra-light Axion-like Particle
• Flux unwinding in the lattice Schwinger model
• Resonant Reconciliation of Convex Models and the Planck
• Quantum corrections to vacuum energy sequestering (with monodromy)
• Confronting quasi-exponential inflation with WMAP seven
• The Trispectrum in the Effective Theory of Inflation with Galilean symmetry
• An update on single field models of inflation in light of WMAP7
• Catastrophic Inflation
• Small field axion inflation with sub-Planckian decay constant
• Entanglement negativity in de Sitter biverse from Stringy Axionic Bell pair: An analysis using Bunch-Davies vacuum
• Asymmetric reheating from a symmetric inflationary potential
• Dependence of the amplitude of gravitational waves from preheating on the inflationary energy scale
• Trans-Planckian Effects in Warm Inflation
• Towards an Observational Appraisal of String Cosmology
• Detectable Data-driven Features in the Primordial Scalar Power Spectrum
• Holographic theories at finite $\theta$-angle, CP-violation, glueball spectra and strong-coupling instabilities
• Modulated Inflation Models and Primordial Black Holes
• Generically large nongaussianity in small multifield inflation
• Tracking Dark Energy from Axion-Gauge Field Couplings
• Analytic description of monodromy oscillons
• Gauge Field Production and Schwinger Reheating in Runaway Axion Inflation
• Moduli backreaction and supersymmetry breaking in string-inspired inflation models
• Large Field Inflation Models from Higher-Dimensional Gauge Theories
• Modified natural inflation: A small single field model with a large tensor to scalar ratio
• Instanton Resummation and the Weak Gravity Conjecture
• Observing the Structure of the Landscape with the CMB Experiments
• Optical Lensing by Axion Stars: Observational Prospects with Radio Astrometry
• Reheating in Chaotic D-Term Inflation
• Inflation with a class of concave inflaton potentials in Randall-Sundrum model
• Potential-driven Inflation with Disformal Coupling to Gravity
• Spectral Distortions from Axion Monodromy Inflation
• Testing Inflation: A Bootstrap Approach
• On the Generality and Persistence of Cosmological Stasis
• A natural theory of dark energy
• Refining the nonlinear modelling of primordial oscillatory features
• N-flation in Supergravity
• Observable Quantum Loop Effects in the Sky
• Orbifold Line Topology and the Cosmic Microwave Background
• Inflationary Cosmology via Quantum Corrections in M-theory
• Reheating and Entropy Perturbations in Fibre Inflation
• Prospects for Primordial Gravitational Waves in String Inflation
• Power spectrum oscillations from Planck-suppressed operators in effective field theory motivated monodromy inflation
• B-modes and the sound speed of primordial fluctuations
• Post-inflationary structure formation boosted by parametric self-resonance
• Axion Monodromy Inflation, Trapping Mechanisms and the Swampland
• Reviving chaotic inflation with fermion production: a supergravity model
• Synthetic Gravitational Waves from a Rolling Axion Monodromy
• Large Field Excursions from Dimensional (De)construction
• Non-Minimal M-flation
• Consistency Relations for Large Field Inflation
• Formation of solitons and their transitions in scalar-field dark matter models with a non-polynomial self-interaction potential
• Cosmic Microwave Background Dipole Asymmetry could be explained by Axion Monodromy Cosmic Strings
• Constraining inflation with nonminimal derivative coupling with the Parkes Pulsar Timing Array third data release
• Confronting the Potential-driven DBI-inspired nonminimal kinetic coupling (Dinkic) inflation to the observational data
• Constraints on small-field axion inflation
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• The IR Obstruction to UV Completion for Dante's Inferno Model with Higher-Dimensional Gauge Theory Origin
• Trans-Planckian Effect in $f(R)$ Cosmology
• Natural Chain Inflation
• No Warm Inflation From a Vanilla Axion
• Spectral Distortion Signatures of Step-like Inflationary Potential
• Inflation in string theory confronts data/Les modèles d'inflation en théorie des cordes face aux observations
• Studying G-axion Inflation model in light of PLANCK
• Thermodynamics of the Primordial Universe
• Peccei-Quinn field for inflation, baryogenesis, dark matter, and much more
• Multi-field inflation and the field-space metric
• Inflating without a flat potential: Viscous inflation
• New- vs. chaotic-inflations
• Shape of the inflaton potential and the efficiency of the universe heating
• Lectures on Naturalness, String Landscape and Multiverse
• CMB constraints on monodromy inflation at strong coupling
• Ultraviolet Sensitivity of Peccei-Quinn Inflation
• Effects of Variable Newton Constant During Inflation
• Cosmological Signatures of Neutrino Seesaw Mechanism
• Cosmological Non-Gaussianity from Neutrino Seesaw Mechanism
• On the prospects of thermalization of axion-SU(2) inflation
• Harrison-Zeldovich attractor: From Planck to ACT results
• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
• On Natural Inflation and Moduli Stabilisation in String Theory
• Tunnelling in Dante's Inferno
• Is inflation from unwinding fluxes IIB?
• The running of featureful primordial power spectra
• Big Bang Nucleosynthesis, the CMB, and the Origin of Matter and Space-Time
• The UV Sensitivity of Axion Monodromy Inflation
• Non-Gaussian and loop effects of inflationary correlation functions in BRST formalism
• Axion scales and couplings with Stückelberg mixing
• Nonminimal Couplings and the Forgotten Field of Axion Inflation
• Nonlinear dynamics of oscillons and transients during preheating after single field inflation
• Gravitational Waves from a Gauge Field Non-minimally Coupled to Gravity
• Natural Inflation on the brane with a TeV-scale gravity: Parameter constraints after Planck 2015
• Spinodal Backreaction During Inflation and Initial Conditions
• Challenges for Moduli Stabilization and String Cosmology near the Conifold
• Planck scale operators, inflation and fine tuning
• Open Strings and Electric Fields in Compact Spaces
• Constant Roll Inflationary Dynamics with Generalized Potentials in $f(R,\varphi ,X)$ Gravity
• Gravitational signatures of ALP dark matter fragmentation
• The Second-Level Preheating
• Refitting cosmological data with neutrino mass and degeneracy
• Inflation Alternative via the Gravitational Field of a Singularity
• At the End of the World: Local Dynamical Cobordism
• Brane/flux annihilation in double-throat system
• Dark energy with oscillatory tracking potential: Observational Constraints and Perturbative effects
• Are latest detected events of gravitational waves in favor of some models of inflation based on string theory?
• Pure Natural Quintessential Inflation and Dark Energy
• Scalar Cosmological Perturbations in M-theory with Higher Derivative Corrections
• Supercooled Audible Axions
• Gravitational Waves from Gauge Quanta Produced during Inflation
• Twisting inflation to sub-Planckian axion decay constants
• Axion Fragmentation on the Lattice
• A double-running inflaton mass for a flat potential and an assisted hilltop inflation
• Light Scalars and the Cosmos: Nambu-Goldstone and Otherwise
• Particle production during inflation: A Bayesian analysis with CMB data from Planck 2018
• Finite inflation in curved space
• Sequestered Inflation
• Mori-Zwanzig formalism for early cosmic inflation
• Circumventing Cosmic Variance via Remote Quadrupole Measurements
• Dual axion-like field inflation
• Constraints on non-canonical chaotic inflation from ACT DR6 and BICEP/Keck data
• Constraining the inflaton potential with gravitational waves from oscillons
• Testing an Inflation Model with Nonminimal Derivative Coupling in the Light of PLANCK 2015 Data
• Aspects of moduli stabilization in type IIB string theory
• Inflation in Brane World Gravity
• The (relative) size does not matter in inflation
• Dynamical Tadpoles and Weak Gravity Constraints
• Modified Power law Inflation: solution to the graceful exit problem and improvement of dark energy models
• Theoretical and observational aspects of cosmological inflation
• Unstable Axion Quintessence Revisited