Loop corrections to a cosmological particle creation

Abstract

We consider dynamics of the massive minimally coupled scalar field theory in an expanding Friedmann-Lemaitre-Robertson-Walker universe. We consider the standard toy model of the conformally flat space-time where the conformal factor becomes constant at the distant past and the distant future. Employing Schwinger-Keldysh diagrammatic technique, we compute infrared loop corrections to the occupation number and anomalous quantum average of the scalar field and show that these corrections are growing with time. Using these observations, we demonstrate that the regularized stress-energy tensor at the distant future acquires substantial quantum corrections which exceed the long known tree-level contributions to the particle flux.

arXiv comment20 pages, 5 figures; V2: corrections are added to match the PRD version

References in corpus (19)

• Introduction to Nonequilibrium Quantum Field Theory
• Infrared Sensitivity of Unstable Vacua
• Lecture notes on interacting quantum fields in de Sitter space
• Hawking radiation and secularly growing loop corrections
• Characters of different secular effects in various patches of de Sitter space
• Many-body theory of non-equilibrium systems
• Infrared dynamics of the massive ${\varphi }^4$ theory on de Sitter space
• Infrared dynamics of massive scalars from the complementary series in de Sitter space
• Secularly growing loop corrections in strong electric fields
• Curved space equilibration vs. flat space thermalization (a short review)
• Dynamical Casimir effect and surprises with loop corrections to it
• Quantum fields in the future Rindler wedge
• Particle creation in nonstationary large N quantum mechanics
• A quantum heating as an alternative of reheating
• Dynamical Casimir effect in nonlinear vibrating cavities
• Nonlinear dynamical Casimir effect at weak nonstationarity
• On quantization in background scalar fields
• Secularly growing loop corrections in scalar wave background
• Out of equilibrium two-dimensional Yukawa theory in a strong scalar wave background

Cited by in corpus (4)

• Enhancement of particle creation in nonlinear resonant cavities
• Loop corrections to the current of created pairs in the lengthy electric pulse
• Quantum dynamics of cosmological particle production: interacting quantum field theories with matrix product states
• Vacuum zero point energy of self-interacting quantum fields in dS background