DBI in the Sky

Abstract

We analyze the spectrum of density perturbations generated in models of the recently discovered "D-cceleration" mechanism of inflation. In this scenario, strong coupling quantum field theoretic effects sum to provide a DBI-like action for the inflaton. We show that the model has a strict lower bound on the non-Gaussianity of the CMBR power spectrum at an observable level, and is thus falsifiable. This in particular observationally distinguishes this mechanism from traditional slow roll inflation generated by weakly interacting scalar fields. The model also favors a large observable tensor component to the CMBR spectrum.

30 pages latex. v2: references added. v3: correction in three point function. v4: sign of non-Gaussianity corrected; fNL is negative

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• Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model
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• Unwinding Inflation
• K-inflationary Power Spectra at Second Order
• N-flation from multiple DBI type actions
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• General Single Field Inflation with Large Positive Non-Gaussianity
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• Exact Mapping between Tensor and Most General Scalar Power Spectra
• Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories
• Large Primordial Trispectra in General Single Field Inflation
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• Non-gaussianity in the strong regime of warm inflation
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• Observational Signatures of Gravitational Couplings in DBI Inflation
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• Large fluctuations and Primordial Black Holes
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• Constraints on anisotropic primordial non-Gaussianity from intrinsic alignments of SDSS-III BOSS galaxies
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• New solutions with accelerated expansion in string theory
• Fluid Inflation
• The structure of correlation functions in single field inflation
• Secondary non-Gaussianity and Cross-Correlation Analysis
• DBI N-flation
• Inflationary predictions in scalar-tensor DBI inflation
• Inflation from Flux Cascades
• Relativistic effects and primordial non-Gaussianity in the galaxy bias
• Effective Field Theory of non-Attractor Inflation
• Fine-Tuning in DBI Inflationary Mechanism
• The Weak Lensing Bispectrum Induced By Gravity
• One-loop corrections to the power spectrum in general single-field inflation
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• On Born-Infeld Gravity in Three Dimensions
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• Multi-Field Inflation on the Landscape
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• Cosmology at the top of the ${\alpha }^{\prime }$ tower
• Tachyon inflation with steep potentials
• String Cosmology - Large-Field Inflation in String Theory
• Cosmological Constant Behavior in DBI Theory
• Single-Field Inflation After WMAP5
• "Finite" Non-Gaussianities and Tensor-Scalar Ratio in Large Volume Swiss-Cheese Compactifications
• Scale dependent non-Gaussianities in the CMB data identified with Minkowski Functionals and Scaling Indices
• Brane inflation without slow-roll
• Anisotropic singularities in modified gravity models
• Observational constraints on tachyon and DBI inflation
• Warped Wilson Line DBI Inflation
• Disformally coupled inflation
• Les Houches lectures on inflationary observables and string theory
• DBI Inflation using a One-Parameter Family of Throat Geometries
• de Sitter swampland bound in the Dirac-Born-Infeld inflation model
• Non-Gaussianities in Collider Energy Flux
• Bispectra from two-field inflation using the long-wavelength formalism
• Gravitational Wave Constraints on Multi-Brane Inflation
• Detectable primordial non-gaussianities and gravitational waves in k-inflation
• Non-Gaussianity from Self-Ordering Scalar Fields
• Bridging geometries and potentials in DBI cosmologies
• Self-reproduction in k-inflation
• Fisher Forecasts for Primordial non-Gaussianity from Persistent Homology
• Preheating in Dirac-Born-Infeld inflation
• Folding Branes
• Lectures on Reheating after Inflation
• DBI models for the unification of dark matter and dark energy
• Slow-Roll Inflation with Exponential Potential in Scalar-Tensor Models
• Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity
• Consistency relation in power law G-inflation
• Why Must Primordial Non-Gaussianity Be Very Small?
• Optimizing future experimental probes of inflation
• Structures in the Gauge/Gravity Duality Cascade
• Post-inflationary behavior of adiabatic perturbations and tensor-to-scalar ratio
• New Shapes of Primordial Non-Gaussianity from Quasi-Single Field Inflation with Multiple Isocurvatons
• Dangerous Angular KK/Glueball Relics in String Theory Cosmology
• Resurrecting the Power-law, Intermediate, and Logamediate Inflations in the DBI Scenario with Constant Sound Speed
• Symmetric Scalars
• Clustering dark energy imprints on cosmological observables of the gravitational field
• Running of the Running and Entropy Perturbations During Inflation
• G-Curvaton
• Power-counting during single-field slow-roll inflation
• Constraints on Primordial non-Gaussianity from Future HI Intensity Mapping Experiments
• DBI Inflation in N=1 Supergravity
• Anatomy of bispectra in general single-field inflation -- modal expansions
• Anisotropies in Scalar-Induced Gravitational-Wave Background from Inflaton-Curvaton Mixed Scenario with Sound Speed Resonance
• Black holes of dimensionally continued gravity coupled to Born-Infeld electromagnetic field
• Black hole formation and growth with non-Gaussian primordial density perturbations
• Kasner solutions, climbing scalars and big-bang singularity
• Trispectrum estimation in various models of equilateral type non-Gaussianity
• Enhanced Inflation in the Dirac-Born-Infeld framework
• Non-Gaussianity from Lifshitz Scalar
• Local non-Gaussianity from rapidly varying sound speeds
• The Quantum Field Theory of K-mouflage
• Slow-Roll Inflation in Scalar-Tensor Models
• Non-Gaussian Halo Mass Function and Non-Spherical Halo Collapse: Theory vs. Simulations
• Power spectra in warm G-inflation and its consistency: stochastic approach
• Canonical invariance of spatially covariant scalar-tensor theory
• Finite N effects on the collapse of fuzzy spheres
• Inflation in DBI models with constant gamma
• Dynamics of Dirac-Born-Infeld dark energy interacting with dark matter
• DBI Galileon in the Effective Field Theory of Inflation: Orthogonal non-Gaussianities and constraints from the Trispectrum
• Primordial Spikes from Wrapped Brane Inflation
• Magnetized topological black holes of dimensionally continued gravity
• Modified Friedmann Equation and Inflation in Warped Codimension-two Braneworld
• D-brane Bremsstrahlung
• Inflation without Inflaton(s)
• Preheating with the Brakes On: The Effects of a Speed Limit
• The Probability Distribution for Non-Gaussianity Estimators
• Induced Gravitational Waves from Multi-Sound Speed Resonances during Cosmological Inflation
• DBI with Primordial Magnetic Field in the Sky
• Lovelock black holes surrounded by dark fluid in power-Yang-Mills massive gravity
• D-term Uplifted Racetrack Inflation
• Rotating a Curvaton Brane in a Warped Throat
• Strong Coupling Dynamics of the Higgs Branch: Rolling a Higgs by Collapsing an Instanton
• Fields Annihilation and Particles Creation in DBI inflation
• On degenerate models of cosmic inflation
• Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation
• Varying Alpha Driven by the Dirac-Born-Infeld Scalar Field
• Scale-dependent CMB asymmetry from primordial configuration
• Inflationary universe in the presence of a minimal measurable length
• Higgs inflation with non-minimal derivative coupling to gravity
• Observational constraints on assisted k-inflation
• General CMB bispectrum analysis using wavelets and separable modes
• Fragile Black Holes
• Horndeski stars
• Dark D-Brane Cosmology: from background evolution to cosmological perturbations
• A Self-gravitating Dirac-Born-Infeld Global Monopole
• Mimetic Inflation
• Numerical evaluation of inflationary 3-point functions on curved field space
• Dirac-Born-Infeld warm inflation realization in the strong dissipation regime
• Non-Canonical Inflation in Supergravity
• The Degeneracy Problem in Non-Canonical Inflation
• Production of non-gaussianities in a bouncing phase
• Holographic non-Gaussianities in general single-field inflation
• On the Trispectrum of Galileon Inflation
• Geometrically Consistent Approach to Stochastic DBI Inflation
• Universality in generalized models of inflation
• Anisotropic constant-roll inflation for the Dirac-Born-Infeld model
• New DBI Inflation model with Kinetic Coupling to Einstein Gravity
• Quantum Corrections to Generic Branes: DBI, NLSM, and More
• Spectator field models in light of spectral index after Planck
• Primordial non-Gaussianity in noncanonical warm inflation
• DBI Galileon inflation in the light of Planck 2015
• A Modal Approach to the Numerical Calculation of Primordial non-Gaussianities
• Gravitino Dark Matter and Non-Gaussianity
• Magnetogenesis and the primordial non-gaussianity
• Exploring ALPs beyond the canonical
• Planck Limits on Non-canonical Generalizations of Large-field Inflation Models
• Effects of Light Fields During Inflation
• Effect of primordial non-Gaussianities on the far-UV luminosity function of high-redshift galaxies: implications for cosmic reionization
• Non-Unitary Evolution in the General Extended EFT of Inflation & Excited Initial States
• Constraining the WMAP9 bispectrum and trispectrum with needlets
• Primordial non-Gaussianity in warm inflation using $\delta N$ formalism
• The probability distribution for non-Gaussianity estimators constructed from the CMB trispectrum
• Boom and Bust Inflation: a Graceful Exit via Compact Extra Dimensions
• Magnon Inflation: Slow Roll with Steep Potentials
• Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
• Oscillons during Dirac-Born-Infeld Preheating
• Delta-N formalism for the evolution of the curvature perturbations in generalized multi-field inflation
• Non-commutative Geometry Modified Non-Gaussianities of Cosmological Perturbation
• Trispectrum versus Bispectrum in Single-Field Inflation
• Cosmological perturbations from multi-field inflation
• Confronting brane inflation with Planck and pre-Planck data
• Mimetic DBI Inflation in Confrontation with Planck2018 data
• Multipoint correlators in multifield cosmology
• Inflationary Adler Conditions
• Nonlinear superhorizon perturbations of non-canonical scalar field
• Non-Gaussianities in multi-field DBI inflation with a waterfall phase transition
• Non-standard kinetic term as a natural source of non-Gaussianity
• Disformal transformations on the CMB
• Non-Gaussianities in a two-field generalization of Natural Inflation
• Galileon intermediate inflation
• Non-Gaussian Shape Recognition
• Stable small spatial hairs in a power-law k-inflation model
• Complexity of non-trivial sound speed in inflation
• Spinflation with Angular Potentials
• Perturbative region on non-Gaussian parameter space in single-field inflation
• Scale-dependent hemispherical asymmetry from general initial state during inflation
• Revisiting non-Gaussianity of multiple-field inflation from the field equation
• Wigner-Eckart theorem in cosmology: Bispectra for total-angular-momentum waves
• Identifying the inflaton with primordial gravitational waves
• A Quintessentially Geometric Model
• Codimension-2 brane inflation
• Non-Gaussianity from false vacuum inflation: Old curvaton scenario
• Deformation of Axion Potentials: Implications for Spontaneous Baryogenesis, Dark Matter, and Isocurvature Perturbations
• Unitarity bounds and RG flows in time dependent quantum field theory
• DBI Galileon and Late time acceleration of the universe
• $f(\bar{R},L(X))$-gravity in the context of dark energy with power law expansion and energy conditions
• Keeping an Eye on DBI: Power-counting for small-$c_s$ Cosmology
• Testing inflationary consistency relations by the potential CMB observations
• An Inflationary Scenario in Intersecting Brane Models
• Adiabatic versus Isocurvature Non--Gaussianity
• Why does the effective field theory of inflation work?
• Embedding DBI inflation in scalar-tensor theory
• CMB imprints of non-canonical anisotropic inflation
• Mixed non-Gaussianity in multiple-DBI inflation
• Observational consequences of the Standard Model Higgs inflation variants
• Primordial Black Holes from Effective Field Theory of Stochastic Single Field Inflation at NNNLO
• Dynamical Analysis of Scalar Field Cosmologies with Spatial Curvature
• Warm Higgs G-inflation: predictions and constraints from Planck 2015 likelihood
• Numerical Relativity and High Energy Physics: Recent Developments
• Inflationary perturbation spectrum in extended effective field theory of inflation
• Non-Gaussian Signatures from the Postinflationary Early Universe
• Inflation with Derivative Self-interaction and Coupling to Gravity
• Primordial Black Holes Dark Matter and Secondary Gravitational Waves from Warm Higgs-G Inflation
• Acausality in Superfluid Dark Matter and MOND-like Theories
• Non-Gaussianity in multi-sound-speed disformally coupled inflation
• Thermal non-Gaussianity in holographic cosmology
• Non-Gaussianity and gravitational wave background in curvaton with a double well potential
• Stochastic tunneling for strongly non-Gaussian inflationary theories
• A weak lensing view on primordial non-Gaussianities
• Wheeler-De Witt equation for brane gravity
• Probing local non-Gaussianities within a Bayesian framework
• Reconstructing Single Field Inflationary Actions From CMBR Data
• Brane Bremsstrahlung in DBI Inflation
• On the Validity of a Factorizable Metric Ansatz in String Cosmology
• Resonant non-Gaussianity with equilateral properties
• Momentum dependence of the bispectrum in two-field inflation
• Stability of braneworlds with non-minimally coupled multi-scalar fields
• Cosmological effects on $f(\bar{R},\bar{T})$ gravity through a non-standard theory
• Effect of intermediate Minkowskian evolution on CMB bispectrum
• Collapsing scenarios of K-essence generalized Vaidya spacetime under $f(\bar{R},\bar{T})$ gravity
• Reconciling tensor and scalar observables in G-inflation
• Particle Production during Inflation in Light of PLANCK
• Imprint of primordial non-Gaussianity on dark matter halo profiles
• The Renormalization Group for Large-Scale Structure: Primordial non-Gaussianities
• Scale-dependent Bias from the Reconstruction of Non-Gaussian Distributions
• The Measure for the Multiverse and the Probability for Inflation
• Non-canonical kinetic structures in the swampland
• Effects of the speed of sound at large-N
• Inflationary Twin Models
• Non-Gaussianities in the Extended EFT of Inflation
• Constraining Models of Dark Energy
• Higher-dimensional black holes with Dirac-Born-Infeld (DBI) global defects
• The Trispectrum in the Effective Theory of Inflation with Galilean symmetry
• Tensor modes on the string theory landscape
• Non-Gaussianity after BICEP2
• DBI Inflation and Warped Black Holes
• Nonlinear Field Space Cosmology
• Non-Gaussianity in two-field inflation beyond the slow-roll approximation
• Constraining primordial non-Gaussianity with cosmological weak lensing: shear and flexion
• Cosmology of Dirac-Born-Infeld dRGT massive gravity
• Low Energy Effective Action for Horava-Witten Cosmology
• An improved estimator for non-Gaussianity in cosmic microwave background observations
• An update on single field models of inflation in light of WMAP7
• Higher-dimensional DBI Solitons
• Statistics of the excursion sets in models with local primordial non-Gaussianity
• Trispectrum from Co-dimension 2(n) Galileons
• Towards an Observational Appraisal of String Cosmology
• Causal Modifications of Gravity and Their Observational Bounds
• Bispectrum Islands
• Scalar Dark Energy Models and Scalar-Tensor Gravity: Theoretical Explanations for the Accelerated Expansion of Present Universe
• Tachyon Mimetic Inflation as an Instabilities-Free Model
• Generalized disformal invariance of cosmological perturbations with second-order field derivatives
• Tachyon Logamediate inflation on the brane
• Thermal non-Gaussianity in Near-Milne universe
• A note on observational signatures in superluminal unified dark matter models
• Galactic Halos and Black Holes in Non-Canonical Scalar Field Theories
• Testing primordial non-Gaussianities on galactic scales at high redshift
• New natural shapes of non-Gaussianity from high-derivative interactions and their optimal limits from WMAP 9-year data
• Impact of Instrumental Systematics on the CMB Bispectrum
• ISO(4,1) Symmetry in the EFT of Inflation
• Covariant evolution of perturbations during reheating in two-field inflation
• Structure formation in clustering DBI dark energy model with constant sound speed
• Covariant second-order perturbations in generalized two-field inflation
• Scalar field inflation and Shan-Chen fluid models
• Unparticle-Higgs Mixing: MSW Resonances, See-saw Mechanism and Spinodal Instabilities
• Horizon-preserving dualities and perturbations in non-canonical scalar field cosmologies
• On signatures of spontaneous collapse dynamics modified single field inflation
• A note on second-order perturbations of non-canonical scalar fields
• Perturbation Theory in k-Inflation Coupled to Matter
• The growth of DM and DE perturbations in DBI non-canonical scalar field scenario
• Constraints on Single-Field Inflation
• The Trispectrum as a Diagnostic of Primordial Orthogonal non-Gaussianities
• Model-Independent Signatures of New Physics in non-Gaussianity
• Flattened Axion Monodromy Beyond Two Derivatives
• Non-Gaussianities in DBI inflation with angular motion
• Inflationary non-Gaussianities in alpha vacua and consistency with conformal symmetries
• The interplay of CMB temperature lensing power reconstruction with primordial non-Gaussianity of local type
• An Expansion of Well Tempered Gravity
• Enhanced (p)reheating in DBI Inflation
• Non-Linear Resonance in Relativistic Preheating
• Principal Components of CMB non-Gaussianity
• Constraining Modified Gravity with Large non-Gaussianities
• A new signature of primordial non-Gaussianities from the abundance of galaxy clusters
• B-modes and the sound speed of primordial fluctuations
• DBI analog of a decaying vacuum cosmology
• Impact of transforming to Conformal Fermi Coordinates on Quasi-Single Field Non-Gaussianity
• High Energy Physics and Cosmology at the Unification Frontier: Opportunities and Challenges in the coming years
• Generalizing the Swampland: Embedding $P(X,\phi )$ Inflationary Theories in a Curved Multi-field Space
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Cosmological evolution of a D-brane
• Dirac-Born-Infeld-Einstein theory with Weyl invariance
• Non-Gaussian signatures of Tachyacoustic Cosmology
• Inflation in string theory confronts data/Les modèles d'inflation en théorie des cordes face aux observations
• On the Production of Open Strings from Brane Anti-Brane Annihilation
• Quantum Cosmology Aspects Of D3 Branes and Tachyon Dynamics
• Studying G-axion Inflation model in light of PLANCK
• Anisotropic power-law inflation for models of non-canonical scalar fields non-minimally coupled to a two-form field
• Orthogonal non-Gaussianity in DBI Galileon: prospect for Planck polarisation and post-Planck experiments
• Strongly Coupled Sectors in Inflation: Gapless Theories and Unparticles
• Attractor Solutions in Tachyacoustic Cosmology
• DBI Lifshitz Inflation
• Optimal bispectrum constraints on single-field models of inflation
• Causality Constraint on Circuit Complexity from $COSMOEFT$
• Non-Gaussianity in a general kind noncanonical warm inflation
• K-Inflation in Noncommutative Space-Time
• Connections between Minkowski and Cosmological Correlation Functions
• Consistency relation for the Lorentz invariant single-field inflation
• Trapped Brane Features in DBI Inflation
• Zonal Modes of Cosmic Microwave Background Temperature Maps
• Shock waves as branes with throats
• Observational Viability of the Intermediate DBI Inflation in the Presence of a Minimal Length
• Frustration of resonant preheating by exotic kinetic terms
• A general method for the construction of stable Galileon models consistent with the Planck data results
• D-branes and cosmic structure
• Neural Network Reconstruction of Non-Gaussian Initial Conditions from Dark Matter Halos
• Constraining Inflationary Scenarios with Braneworld Models and Second Order Cosmological Perturbations
• Probing Inflation with Precision Bispectra
• Superimposed Oscillations in Brane Inflation
• General-relativistic spin system
• Lectures on Naturalness, String Landscape and Multiverse
• Confronting Inflation Models with the Coming Observations on Primordial Gravitational Waves
• Primordial non-Gaussianity in noncanonical warm inflation: three- and four-point correlations
• Inflation driven by scalar field and solid matter
• Propagation Constraints and Classical Solutions in K-essence Like Theories
• The Non-Adiabatic Pressure Perturbation and Non-Canonical Kinetic Terms in Multifield Inflation
• The Size of Local Bispectrum and Trispectrum in a Non-Minimal Inflation
• Viable Intermediate Inflation in the Mimetic DBI Model
• Cherenkov in the Sky: Measuring the Sound Speed of Primordial Scalar Fluctuations
• The adiabatic/entropy decomposition in $P({\varphi }^I,X^{IJ})$ theories with multiple sound speeds
• Anisotropic power-law inflation for the Sáez-Ballester theory non-minimally coupled to a vector field
• Cosmological correlation functions in scalar and vector inflationary models
• String Loop Moduli Stabilisation and Cosmology in IIB Flux Compactifications
• Effective Field Theory for Inflation
• Stabilising the Planck mass shortly after inflation
• Primordial Black Holes in non-linear perturbation theory
• Ultra-light dark matter with non-canonical kinetics reopening the mass window
• Inflation: a quantum laboratory on cosmological scales
• Inflation and Cyclotron Motion
• Spinflation with backreaction
• Brane Isotropisation in Extra-Dimensional Tolman-Bondi Universe
• Revisiting the Chern-Simons interaction during inflation with a non-canonical pseudo-scalar
• Inflationary predictions at small gamma
• Cosmological Perturbations in Inflationary Models with Anisotropic Space-Time Scaling in Lifshitz Background
• A new branch of inflationary speed limits
• Complete factorization of equations of motion for generalized scalar field theories
• Horndeski in motion
• Non-trivial Extension of Starobinsky Inflation
• Kinematic equivalence between models driven by DBI field with constant $\gamma$ and exotic holographic quintessence cosmological models
• On the four-dimensional effective theories in brane-worlds
• Testing a Two Field Inflation Beyond the Slow-Roll Approximation
• Primordial non-Gaussianity in noncanonical warm inflation with nonminimal derivative coupling
• Propagator positivity bounds for cosmological correlators
• Cosmology on Compact and Stable Supergravity Background
• Precision calculation of the EFT likelihood with primordial non-Gaussianities
• Slow-walking inflation
• Non-perpetual Eternal Inflation and the Emergent de Sitter Swampland Conjecture
• Primordial Fluctuations in String Cosmology
• Probing single-field inflation: predictions, constraints, and theoretical viewpoints
• Inhomogeneous Reheating Scenario with DBI fields
• Bouncing cosmologies in the presence of a Dirac-Born-Infeld field
• On the validity of cosmic no-hair conjecture in an anisotropic inflationary model
• Primordial black hole formation in k-inflation models
• Inflationary spectral tilts as a result of the dilatation symmetry breaking
• Caustic formation in DBI models: Wave propagation on planar domain walls
• Modification from Noncommutative Inflation
• Revisiting the angular momentum growth of protostructures evolved from non-Gaussian initial conditions
• Hamilton-Jacobi analysis of noncanonical inflation in $f(R,T)$ gravity: Constraints from Planck/ACT data, and theoretical bounds
• Stochastic Inflation in Compact Extra Dimensions
• Non-Gaussianity in Cosmology: from Inflation to the CMB
• Quijote PNG: The information content of the halo power spectrum and bispectrum
• Multi-brid DBI Inflation
• Cosmological signatures of brane inflation
• Early Universe: inflation and cosmological perturbations
• A Tail of Eternal Inflation
• Hamilton-Jacobi formalism for Generalized Chaplygin Gas models
• Weakly Broken Galileon Symmetry in Cosmology
• Constructing and solving cosmologies of early universes with dark energy and matter. I
• Inflation in an external four-form gauge field
• Time-dependent Backgrounds in String Theory and Dualities