A quantum heating as an alternative of reheating

Abstract

To model a realistic situation for the beginning we consider massive real scalar ${\varphi }^4$ theory in a (1+1)-dimensional asymptotically static Minkowski spacetime with an intermediate stage of expansion. To have an analytic headway we assume that scalars have a big mass. At past and future infinities of the background we have flat Minkowski regions which are joint by the inflationary expansion region. We use the tree-level Keldysh propagator in the theory in question to calculate the expectation value of the stress-energy tensor which is, thus, due to the excitations of the zero-point fluctuations. Then we show that even for large mass, if the de Sitter expansion stage is long enough, the quantum loop corrections to the expectation value of the stress-energy tensor are not negligible in comparison with the tree-level contribution. That is revealed itself via the excitation of the higher-point fluctuations of the exact modes: During the expansion stage a non-zero particle number density for the exact modes is generated. This density is not Plankian and serves as a quench which leads to a thermalization in the out Minkowski stage.

arXiv comment31 pages, 1 fig, The version to appear in PRD

References in corpus (56)

• Reheating after Inflation
• Quantum effects can render w<-1 on cosmological scales
• Super-Acceleration from Massless, Minimally Coupled ${\varphi }^4$
• De Sitter Space and Eternity
• Stochastic Quantum Gravitational Inflation
• Super-Hubble de Sitter Fluctuations and the Dynamical RG
• Decay of Vacuum Energy
• The IR stability of de Sitter: Loop corrections to scalar propagators
• Semiclassical relations and IR effects in de Sitter and slow-roll space-times
• Non-Equilibrium Evolution of Scalar Fields in FRW Cosmologies I
• Breakdown of Semiclassical Methods in de Sitter Space
• Infrared Sensitivity of Unstable Vacua
• Lecture notes on interacting quantum fields in de Sitter space
• Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
• On Resumming Inflationary Perturbations beyond One-loop
• Scalar Field Dynamics in Friedman Robertson Walker Spacetimes
• Infrared Correlations in de Sitter Space: Field Theoretic vs. Stochastic Approach
• On the Equivalence between Euclidean and In-In Formalisms in de Sitter QFT
• Infrared dynamics in de Sitter space from Schwinger-Dyson equations
• Classical approximation to quantum cosmological correlations
• An effective field theory during inflation: reduced density matrix and its quantum master equation
• Nonperturbative resummation of de Sitter infrared logarithms in the large-N limit
• Massless interacting quantum fields in deSitter spacetime
• Infrared instability of the de Sitter space
• An effective field theory during inflation II: stochastic dynamics and power spectrum suppression
• Perturbative Quantum Gravity Comes of Age
• Hawking radiation and secularly growing loop corrections
• Scalar field correlator in de Sitter space at next-to-leading order in a 1/N expansion
• Quantum scalar fields in de Sitter space from the nonperturbative renormalization group
• Perturbative S-matrix for massive scalar fields in global de Sitter space
• Renormalization group flow and symmetry restoration in de Sitter space
• A Completely Regular Quantum Stress Tensor with $w<-1$
• Cosmological diagrammatic rules
• Many-body theory of non-equilibrium systems
• Infrared dynamics of the massive ${\varphi }^4$ theory on de Sitter space
• Critical behavior in spherical and hyperbolic spaces
• IR divergences and kinetic equation in de Sitter space. (Poincare patch; Principal series)
• Infrared dynamics of massive scalars from the complementary series in de Sitter space
• Effective Field Theory out of Equilibrium: Brownian quantum fields
• The IR stability of de Sitter QFT: Physical initial conditions
• Vacuum Fluctuations of a Scalar Field during Inflation: Quantum versus Stochastic Analysis
• On Infrared Effects in de~Sitter Background
• Nonperturbative renormalization group for scalar fields in de Sitter space: beyond the local potential approximation
• Cosmological UV/IR Divergences and de-Sitter Spacetime
• $O(N)$ model in Euclidean de Sitter space: beyond the leading infrared approximation
• Solution of the Dyson--Schwinger equation on de Sitter background in IR limit
• Secularly growing loop corrections in strong electric fields
• Physical meaning and consequences of the loop IR divergences in global dS
• Superhorizon entanglement entropy from particle decay in inflation
• Dynamical Casimir effect and surprises with loop corrections to it
• Order parameter evolution in scalar QFT: renormalization group resummation of secular terms
• The Quantum Corrected Mode Function and Power Spectrum for a Scalar Field during Inflation
• Time evolution of cascade decay
• Massless Interacting Scalar Fields in de Sitter space
• Secularly growing loop corrections to the dynamical Casimir effect
• Quantum corrected power spectra of massless minimally coupled scalars during inflation: Effects of Yukawa coupling versus quartic self-interaction

Cited by in corpus (14)

• Characters of different secular effects in various patches of de Sitter space
• Curved space equilibration vs. flat space thermalization (a short review)
• Semiclassical Approximation meets Keldysh-Schwinger diagrammatic technique: Scalar ${\phi }^4$
• Particle creation in nonstationary large N quantum mechanics
• Quantum Effects of Mass on Scalar Field Correlations and Fluctuations during Inflation
• Debye mass in de Sitter space
• Comments on the adiabatic theorem
• Nonlinear dynamical Casimir effect at weak nonstationarity
• On quantization in background scalar fields
• Secularly growing loop corrections in scalar wave background
• Enhancement of particle creation in nonlinear resonant cavities
• Loop corrections to a cosmological particle creation
• Out of equilibrium two-dimensional Yukawa theory in a strong scalar wave background
• On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times