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

IF 1.2 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Gravitation and Cosmology Pub Date : 2023-09-04 DOI:10.1134/S0202289323030040

Karam Chand

引用次数: 0

Abstract

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

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Bianchi - i型宇宙中暴胀和粒子产生的压缩热态表示

我们使用单模压缩热真空态形式，在Bianchi - i型宇宙的半经典引力框架下，研究了与引力最小耦合的大质量均匀标量场的性质。我们获得了Bianchi - i型宇宙的半经典爱因斯坦方程的估计导解，表明每个尺度因子在其各自的方向上服从\(t^{2/3}\)幂律展开。本文还分析了Bianchi - i型宇宙中非经典热宇宙粒子产生的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Gravitation and Cosmology ASTRONOMY & ASTROPHYSICS-

CiteScore

1.70

自引率

22.20%

发文量

审稿时长

>12 weeks

期刊介绍： Gravitation and Cosmology is a peer-reviewed periodical, dealing with the full range of topics of gravitational physics and relativistic cosmology and published under the auspices of the Russian Gravitation Society and Peoplesâ€™ Friendship University of Russia. The journal publishes research papers, review articles and brief communications on the following fields: theoretical (classical and quantum) gravitation; relativistic astrophysics and cosmology, exact solutions and modern mathematical methods in gravitation and cosmology, including Lie groups, geometry and topology; unification theories including gravitation; fundamental physical constants and their possible variations; fundamental gravity experiments on Earth and in space; related topics. It also publishes selected old papers which have not lost their topicality but were previously published only in Russian and were not available to the worldwide research community