Quantum Origin of Noise and Fluctuations in Cosmology

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dc.creatorHu, B. L.
dc.creatorPaz, Juan Pablo
dc.creatorZhang, Yuhong
dc.date1995-12-29
dc.date.accessioned2026-07-07T03:30:58Z
dc.date.available2026-07-07T03:30:58Z
dc.descriptionWe address two basic issues in the theory of galaxy formation from fluctuations of quantum fields: 1) the nature and origin of noise and fluctuations and 2) the conditions for using a classical stochastic equation for their description. On the first issue, we derive the influence functional for a $λϕ^4 $ field in a zero-temperature bath in de Sitter universe and obtain the correlator for the colored noises of vacuum fluctuations. This exemplifies a new mechanism we propose for colored noise generation which can act as seeds for galaxy formation with non-Gaussian distributions. For the second issue, we present a (functional) master equation for the inflaton field in de Sitter universe. By examining the form of the noise kernel we study the decoherence of the long-wavelength sector and the conditions for it to behave classically.
dc.descriptionPlain Tex, 32 pages. This is a reprint of a 1992 conference talk published in 1993. It is related to two later papers on similar subjects by E. Calzetta and B. L. Hu, gr-qc/9312036 [Phys. Rev. D49, 6636 (1994)] and gr-qc/9505046 [Phys. Rev. D52, (Dec. 15, 1995)]
dc.identifierhttps://arxiv.org/abs/gr-qc/9512049
dc.identifierhttp://arxiv.org/abs/gr-qc/9512049
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/35704
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleQuantum Origin of Noise and Fluctuations in Cosmology
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