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- W2130744702 abstract "We show that dissipative effects have a significant impact on the evolution of cosmological scalar fields, leading to friction, entropy production and field fluctuations. We explicitly compute the dissipation coefficient for different scalar fields within the standard model and some of its most widely considered extensions, in different parametric regimes. We describe the generic consequences of fluctuation-dissipation dynamics in the postinflationary universe, focusing in particular on friction and particle production, and analyze in detail two important effects. First, we show that dissipative friction delays the process of spontaneous symmetry breaking and may even damp the motion of a Higgs field sufficiently to induce a late period of warm inflation. Along with dissipative entropy production, this may parametrically dilute the abundance of dangerous thermal relics. Second, we show that dissipation can generate the observed baryon asymmetry without symmetry restoration, and we develop in detail a model of dissipative leptogenesis. We further show that this generically leads to characteristic baryon isocurvature perturbations that can be tested with cosmic microwave background observations. This work provides a fundamental framework to go beyond the leading thermal equilibrium semiclassical approximation in addressing fundamental problems in modern cosmology." @default.
- W2130744702 created "2016-06-24" @default.
- W2130744702 creator A5056521026 @default.
- W2130744702 creator A5069319908 @default.
- W2130744702 creator A5069527014 @default.
- W2130744702 date "2015-04-29" @default.
- W2130744702 modified "2023-10-14" @default.
- W2130744702 title "Fluctuation-dissipation dynamics of cosmological scalar fields" @default.
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- W2130744702 doi "https://doi.org/10.1103/physrevd.91.083540" @default.
- W2130744702 hasPublicationYear "2015" @default.
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