Pre-slow roll initial conditions: large scale power suppression and infrared aspects during inflation

Abstract

If the large scale anomalies in the temperature power spectrum of the cosmic microwave background are of primordial origin, they may herald modifications to the slow roll inflationary paradigm on the largest scales. We study the possibility that the origin of the large scale power suppression is a modification of initial conditions during slow roll as a result of a pre-slow roll phase during which the inflaton evolves rapidly. This stage is manifest in a potential in the equations for the Gaussian fluctuations during slow roll and modify the power spectra of scalar perturbations via an initial condition transfer function $\mathcal{T}(k)$. We provide a general analytical study of its large and small scale properties and analyze the impact of these initial conditions on the infrared aspects of typical test scalar fields. The infrared behavior of massless minimally coupled test scalar field theories leads to the dynamical generation of mass and anomalous dimensions, both depend non-analytically on $\mathcal{T}(0)$. During inflation all quanta decay into many quanta even of the same field because of the lack of kinematic thresholds. The decay leads to a quantum entangled state of sub and superhorizon quanta with correlations across the horizon. We find the modifications of the decay width and the entanglement entropy from the initial conditions. In all cases, initial conditions from a ``fast-roll'' stage that lead to a suppression in the scalar power spectrum at large scales also result in a suppression of the dynamically generated masses, anomalous dimensions and decay widths.

expanded discussion on fast-slow roll stage. version to appear in PRD

References in corpus (31)

• Quantum Contributions to Cosmological Correlations II: Can These Corrections Become Large?
• Enhanced Non-Gaussianity from Excited Initial States
• Semiclassical relations and IR effects in de Sitter and slow-roll space-times
• Leading Log Solution for Inflationary Yukawa
• Breakdown of Semiclassical Methods in de Sitter Space
• Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
• On the divergences of inflationary superhorizon perturbations
• On Resumming Inflationary Perturbations beyond One-loop
• On the proper treatment of massless fields in Euclidean de Sitter space
• Infrared dynamics in de Sitter space from Schwinger-Dyson equations
• Classical approximation to quantum cosmological correlations
• Reply to `Can infrared gravitons screen $\Lambda$?'
• Infrared Propagator Corrections for Constant Deceleration
• Energy Transfer in Multi Field Inflation and Cosmological Perturbations
• A Note on Calm Excited States of Inflation
• Lifetime of a massive particle in a de Sitter universe
• Fermion Mass Generation in de Sitter Space
• Kinetic Initial Conditions for Inflation
• Interacting Field Theories in de Sitter Space are Non-Unitary
• CMB quadrupole suppression: I. Initial conditions of inflationary perturbations
• The CMB Quadrupole depression produced by early fast-roll inflation: MCMC analysis of WMAP and SDSS data
• Inflationary Infrared Divergences: Geometry of the Reheating Surface vs. delta N Formalism
• Condensates and quasiparticles in inflationary cosmology: mass generation and decay widths
• On the Perturbative Stability of Quantum Field Theories in de Sitter Space
• Cosmological UV/IR Divergences and de-Sitter Spacetime
• Classical radiation by free-falling charges in de Sitter spacetime
• Spontaneous symmetry breaking in inflationary cosmology: on the fate of Goldstone Bosons
• ${\varphi }^4$ inflation is not excluded
• Generalizing Starobinskii's Formalism to Yukawa Theory & to Scalar QED
• Study of the Spectrum of Inflaton Perturbations
• Quantum slow-roll and quantum fast-roll inflationary initial conditions: CMB quadrupole suppression and further effects on the low CMB multipoles

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• Power Suppression at Large Scales in String Inflation
• Inflation in the closed FLRW model and the CMB
• Fossilized Gravitational Wave Relic and Primordial Clocks
• Examining the consistency relations describing the three-point functions involving tensors
• Large Slow Roll Parameters in Single Field Inflation
• Tensor to scalar ratio and large scale power suppression from pre-slow roll initial conditions
• Quantum gravity corrections to the conformally coupled scalar self-mass-squared on de Sitter II: kinetic-conformal cross terms
• Correlating CMB Spectral Distortions with Temperature: what do we learn on Inflation?
• Tensor perturbations during inflation in a spatially closed Universe
• Quantum gravity corrections to the conformally coupled scalar self-mass-squared on de Sitter background
• Role of trans-Planckian modes in cosmology
• The Quantum Corrected Mode Function and Power Spectrum for a Scalar Field during Inflation
• Quantum Effects of Mass on Scalar Field Correlations and Fluctuations during Inflation
• Looking for non-Gaussianity in all the right places: A new basis for non-separable bispectra
• Studying G-axion Inflation model in light of PLANCK
• Tracking Pre-inflation Era from density perturbation spectra
• Hidden in the background: a local approach to CMB anomalies
• Cosmic tango between the very small and the very large: Addressing CMB anomalies through Loop Quantum Cosmology
• Constraining Planck scale physics with CMB and Reionization Optical Depth
• Non-equilibrium evolution of quantum fields during inflation and late accelerating expansion