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.

31 pages, 1 fig, The version to appear in PRD

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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