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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1305.0229 (astro-ph)
[Submitted on 1 May 2013]

Title:Fluctuation-dissipation and equilibrium for scalar fields in de Sitter

Authors:Gerasimos Rigopoulos
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Abstract:The infrared dynamics of a minimally coupled scalar field in de Sitter spacetime can be described as Brownian motion of a particle in a medium of de Sitter temperature $T_{DS}=\frac{H}{2\pi}$. The system obeys a fluctuation-dissipation relation and its equilibrium distribution is Maxwell-Boltzmann, implying kinetic and potential energies of comparable magnitudes. The transition to equilibrium is a semi-classical process beyond the scope of perturbation theory for interacting fields. The stochastic kinetic energy of the field causes de Sitter spacetime to cool down slowly with a corresponding decrease of the effective vacuum energy.
Comments: 7 pages, no figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Report number: TUM 889/13
Cite as: arXiv:1305.0229 [astro-ph.CO]
  (or arXiv:1305.0229v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1305.0229

Submission history

From: Gerasimos Rigopoulos [view email]
[v1] Wed, 1 May 2013 17:23:52 UTC (10 KB)
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