Idioma:

Benchmarking the cosmological master equations

Colas, Thomas ; Grain, Julien ; Vennin, Vincent

Eur.Phys.J.C, 2022-12, Vol.82 (12), p.1085-32, Article 1085 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

Texto completo disponível

Citações Citado por

Enviar para

Título:
Benchmarking the cosmological master equations
Autor: Colas, Thomas ; Grain, Julien ; Vennin, Vincent
Assuntos: Analysis ; Astronomy ; Astrophysics ; Astrophysics and Cosmology ; Benchmarks ; Cosmology ; Elementary Particles ; Exact solutions ; General Relativity and Quantum Cosmology ; Hadrons ; Heavy Ions ; High Energy Physics - Phenomenology ; High Energy Physics - Theory ; Initial conditions ; Mathematical models ; Measurement Science and Instrumentation ; Nuclear Energy ; Nuclear Physics ; Physics ; Physics and Astronomy ; Power spectra ; Quantum Field Theories ; Quantum Field Theory ; Regular Article - Theoretical Physics ; Scalars ; String Theory
É parte de: Eur.Phys.J.C, 2022-12, Vol.82 (12), p.1085-32, Article 1085
Descrição: Master equations are commonly employed in cosmology to model the effect of additional degrees of freedom, treated as an “environment”, onto a given “system”. However, they rely on assumptions that are not necessarily satisfied in cosmology, where the environment may be out of equilibrium and the background is dynamical. In this work, we apply the master-equation program to a model that is exactly solvable, and which consists of two linearly coupled scalar fields evolving on a cosmological background. The light field plays the role of the system and the heavy field is the environment. By comparing the exact solution to the output of the master equation, we can critically assess its performance. We find that the master equation exhibits a set of “spurious” terms that explicitly depend on the initial conditions, and which arise as a consequence of working on a dynamical background. Although they cancel out in the perturbative limit of the theory (i.e. at leading orders in the interaction strength), they spoil resummation. However, when those terms are removed, the master equation performs impressively well to reproduce the power spectra and the amount of the decoherence of the light field, even in the strongly decohered regime. We conclude that master equations are able to perform late-time resummation, even though the system is far from the Markovian limit, provided spurious contributions are suppressed.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

Links

View record in HAL

Voltar para lista de resultados

Realização: Logos de Redes Sociais:

Benchmarking the cosmological master equations

Colas, Thomas ; Grain, Julien ; Vennin, Vincent

Berlin/Heidelberg: Springer Berlin Heidelberg

Buscando em bases de dados remotas. Favor aguardar.