Density fluctuations and single-mode thermal states in the FRW universe

Dhayal, Renu; Rathore, Meghna; Kambila, Vijay Kumar; Venkataratnam, K. K.

doi:10.1140/epjp/s13360-020-00362-3

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Cited by 4 publications

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“…Thermal counterparts of coherent and squeezed states are recognized as a coherent thermal state [49][50][51][52][53][54] and squeezed thermal state [50,51,[55][56][57][58]. Thermal properties of the nonclassical states play an important role to understand the thermal history and evolution of the early-stage universe [59][60][61][62][63][64][65]. According to cosmological perspective, consideration of thermal effects in flat FRW universe has many significance.…”

Section: Introductionmentioning

confidence: 99%

Squeezed Thermal State Representation of the Inflaton and Particle Production in Bianchi type-I Universe

Chand

2022

Preprint

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In this study, we use a single-mode squeezed thermal vacuum state formalism and examine the nature of a massive homogeneous scalar field, minimally coupled to the gravity in the framework of semiclassical gravity in the Bianchi type-I universe. We have obtained an estimate leading solution to the semiclassical Einstein equation for the Bianchi type-I universe shows, each scale factor in its respective direction obeys t 2 3 power-law expansion. The mechanism of the nonclassical thermal cosmological particle production is also analyzed in the Bianchi type-I universe.

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