Adiabatic CMB perturbations in pre-big bang string cosmology

Abstract

We consider the pre-big bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the universe as it decays into photons, thus creating adiabatic CMB perturbations. We find that the fluctuations in the axion field can give rise to a nearly flat spectrum of adiabatic perturbations with a spectral tilt $\Delta n$ in the range $-0.1\lesssim \Delta n\lesssim 1$.

15 pages, 1 figure; Version to appear in Nucl.Phys.B. Figure improved, discussion and one reference added

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• On the possibility of braneworld quintessential inflation
• "Phantom" Inflation in Warped Compactification
• Narrowing the window of inflationary magnetogenesis
• Entropy Fluctuations in Brane Inflation Models
• Curvatons in Warped Throats
• The Irrelevance of Primordial Black Hole Clustering in the LVK mass range
• Cosmologies from higher-order string corrections
• Exploring Two-Field Inflation in the Wess-Zumino Model
• A new bound on the low reheating temperature with dark matter
• Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations
• Mixed inflaton and curvaton scenario with sneutrinos
• How the curvaton scenario, modulated reheating and an inhomogeneous end of inflation are related
• Hubble-induced mass from MSSM plasma
• Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations
• From heaviness to lightness during inflation
• Bayesian evidence of the post-Planck curvaton
• Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
• Cosmology with the Square Kilometre Array by SKA-Japan
• Higgs Boson in RG running Inflationary Cosmology
• Modulated preheating and isocurvature perturbations
• Curvaton Dynamics Revisited
• Multiple spectator condensates from inflation
• Remarks on Hubble Induced Mass from Fermion Kinetic Term
• Modulated reheating by curvaton
• Non-Gaussianity with Lagrange Multiplier Field in the Curvaton Scenario
• Heavy Particles from Inflation
• Low scale inflation and the immediate heavy curvaton decay
• Stochastic inflation and primordial black holes
• What Planck does not tell us about inflation
• Electrically charged curvaton
• Cosmological data and indications for new physics
• Effective Search Templates for a Primordial Stochastic Gravitational Wave Background
• Modification of the halo mass function by kurtosis associated with primordial non-Gaussianity
• Curvaton model completed
• Probing local non-Gaussianities within a Bayesian framework
• New features in curvaton model
• Non-Gaussianity and gravitational wave background in curvaton with a double well potential
• CMB spectral distortions in generic two-field models
• Non-Gaussian bubbles in the sky
• Coupling structure of multi-field primordial perturbations
• Scale-dependent CMB power asymmetry from primordial speed of sound and a generalized $\delta$N formalism
• Opening up a window on the postinflationary QCD axion
• Constraints on the production of primordial magnetic seeds in pre-big bang cosmology
• Sneutrinos as Mixed Inflaton and Curvaton
• Dynamics of Cosmological Perturbations in Multi-Speed Inflation
• Fully non-linear equivalence of delta N and covariant formalisms
• Large Tensor-to-Scalar Ratio in Small-Field Inflation
• Particle Production during Inflation in Light of PLANCK
• Hemispherical Power Asymmetry of the Cosmic Microwave Background from a Remnant of a pre-Inflationary Topological Defect
• Relaxation leptogenesis, isocurvature perturbations, and the cosmic infrared background
• Quintessential Isocurvature in Separate Universe Simulations
• Structure Formation with Two Periods of Inflation: Beyond PLaIn $\Lambda$CDM
• Cosmic Perturbations from a Rotating Field
• Light cold dark matter from non-thermal decay
• Minimal solution to the axion isocurvature problem from a nonminimal coupling
• CDM/baryon isocurvature perturbations in a sneutrino curvaton model
• Radiative Corrections from Heavy Fast-Roll Fields during Inflation
• Quantum collapse as source of the seeds of cosmic structure during the radiation era
• Alchemical Inflation: inflaton turns into Higgs
• Constraints from CMB in the intermediate Brans-Dicke inflation
• Curvaton Decay into Baryons, anti-Baryons and Radiation
• New developments on embedding inflation in gauge theory and particle physics
• Inflationary parameters and primordial perturbation spectra
• Suppressed Non-Gaussianity in the Curvaton Model
• Towards conformal cosmology
• Curvaton Potential Terms, Scale-Dependent Perturbation Spectra and Chaotic Initial Conditions
• Primordial non-Gaussianity as a probe of seesaw and leptogenesis
• The end of locked inflation
• Smallness of Baryon Asymmetry from Split Supersymmetry
• Isocurvature Fluctuations Induce Early Star Formation
• BICEP2, the curvature perturbation and supersymmetry
• Conformal Universe as false vacuum decay
• A falsely fat curvaton with an observable running of the spectral tilt
• Hubble induced mass after inflation in spectator field models
• Spontaneous Baryogenesis without Baryon Isocurvature
• The Origin of the Large-Scale Structure in the Universe: Theoretical and Statistical Aspects
• Multi-chaotic inflation with and without spectator field
• Pre-big bang on the brane
• Curvaton scenarios with inflaton decays into curvatons
• Liberating the Inflaton from Primordial Spectrum Constraints
• Braneworld Flux Inflation
• Curvaton preheating revisited
• Nambu-Goldstone Affleck-Dine Baryogenesis
• Generating cosmological perturbations with mass variations
• The TeV-mass curvaton
• Curvature Perturbation and Domain Wall Formation with Pseudo Scaling Scalar Dynamics
• Curvaton as dark matter with secondary inflation
• Creating perturbations from a decaying field during inflation
• Cosmological perturbations from a Spectator field during inflation
• Resolving primordial physics through correlated signatures
• Revised $f_{\mathrm{NL}}$ parameter in Curvaton Scenario
• Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data
• Thermal blocking of preheating
• Axionlike Origin of the Primordial Density Perturbation
• On the initial regime of pre-big bang cosmology
• Affleck-Dine baryogenesis with modulated reheating
• Refined Study of Isocurvature Fluctuations in the Curvaton Scenario
• Thermal Effects and Sudden Decay Approximation in the Curvaton Scenario
• A primer on the ekpyrotic scenario
• The running curvaton
• Higher moments of primordial non-Gaussianity and N-body simulations
• Candidates for Inflaton in Quiver Gauge Theory
• Detecting the dark sector through scalar-induced gravitational waves
• Consequences of a stochastic approach to the conformal invariance of inflationary correlators
• Double inflation via non-minimally coupled spectator
• Cosmological Perturbations During Radion Stabilization
• Large Scale Cosmic Perturbation from Evaporation of Primordial Black Holes
• I-ball formation with logarithmic potential
• From Swampland to Phenomenology and Back
• What We Can Learn from the Running of the Spectral Index if no Tensors are Detected in the Cosmic Microwave Background Anisotropy
• Axion-CMB Scenario in Supercooled Universe
• Adiabatic and non-adiabatic perturbations for loop quantum cosmology
• Delta-N Formalism for Curvaton with Modulated Decay
• Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
• Lecture notes on non-Gaussianity
• Affleck-Dine baryogenesis in inflating curvaton scenario with O($10-10^2$TeV) mass moduli curvaton
• Cosmic perturbations, baryon asymmetry and dark matter from the minimal supersymmetric standard model
• Inflation as de Sitter instability
• Conformal Inflation, Modulated Reheating, and WMAP5
• Non-Gaussianities and Primordial Black Holes
• The Effect of Curvaton Decay on the Primordial Power Spectrum
• Curvature perturbation from velocity modulation
• Higgs-like spectator field as the origin of structure
• Non-Gaussianity from two right-handed sneutrino curvaton decays
• Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures
• A model of cosmology and particle physics at an intermediate scale
• Primordial black holes save $R^2$ inflation
• Primordial black holes from the ultraslow-roll phase in the inflaton--curvaton mixed field inflation
• Holographic complexity growth for a charged AdS-dilaton black holes with fixed and dynamical boundary respectively
• Supersymmetric hybrid inflation with a light scalar
• The R-axion and non-Gaussianity
• Scale dependences of local form non-Gaussianity parameters from a DBI isocurvature field
• Consistency relation for the Lorentz invariant single-field inflation
• On Primordial Perturbations of Test Scalar Fields
• Broken scale invariance, $\alpha$-attractors and vector impurity
• Quantifying the 'naturalness' of the curvaton model
• $g_{\mathrm{NL}}$ in the curvaton model constrained by PLANCK
• Spectral index and running of $g_{NL}$ from an isocurvature scalar field
• Reheating dynamics affects non-perturbative decay of spectator fields
• Escape from the swamp with spectator
• A quasi-matter bounce equivalent to Starobinsky inflation
• Particle Production from Oscillating Scalar Field and Consistency of Boltzmann Equation
• Constrained Superfields in Dynamical Background
• Large non-Gaussianity generated after D-term Inflation by Right-Handed Sneutrino Curvaton
• The quantum origin of cosmic structure: theory and observations
• Nonlinear Perturbations in a Variable Speed of Light Cosmology
• Primordial black holes from a curvaton: the role of bimodal distributions
• Quenching preheating by light fields
• Stabilising the Planck mass shortly after inflation
• Flat Direction Dynamics in a Non-Topological Soliton-Dominated Universe
• Right-Handed Sneutrino Curvaton and non-Gaussianity
• Curvaton decay into relativistic matter
• Cosmological correlation functions in scalar and vector inflationary models
• Enlarging the Space of Viable Inflation Models: A Slingshot Mechanism
• Possible origin of CMB temperature fluctuations: Vacuum fluctuations of Kaluza-Klein and string states during inflationary era
• Suppression of the large scale curvature perturbation by interacting fluids
• Constraints on the three-fluid model of curvaton decay
• QCD Axions and CMB Anisotropy
• Where does curvaton reside? Differences between bulk and brane frames
• Inflationary cross-correlations of a non-minimal spectator and their soft limits
• Probing Dark Matter Isocurvature with Primordial Non-Gaussianity
• Anisotropic multiple bounce models
• Planck isocurvature constraint on primordial black holes lighter than a kiloton
• Tilt and Tensor-to-Scalar Ratio in Multi-Scalar Field Inflation: Non-Sum-Separable Case
• Curvature perturbations from preheating with scale dependence
• Pseudo-conformal Universe: late-time contraction and generation of tensor modes
• Spectator fields and their imprints on the Cosmic Microwave Background
• Curvaton mechanism and its implications to sneutrino cosmology
• Mixed Inflaton and Spectator Field Models: CMB constraints and $\mu$ distortion
• The shape of high order correlation functions in CMB anisotropy maps
• Testing Inflationary Cosmology
• Passive Curvaton
• Quantum Creation of a Toy Universe without Inflation
• On the space of non-Gaussian fields with single-clock bispectra
• Galaxy number-count dipole and superhorizon fluctuations
• Non-Gaussianity after many-field reheating
• Weakly Broken Galileon Symmetry in Cosmology
• Higher order non-linear parameters with PLANCK
• Kinematically Blocked Curvaton
• Hawking and Unruh radiation perception by different observers: applications of the effective temperature function (in Spanish)
• Towards an analytic solution of rapid roll inflation with a quartic potential
• Primordial Fluctuations in String Cosmology