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
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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。
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来源期刊
Gravitation and Cosmology
Gravitation and Cosmology ASTRONOMY & ASTROPHYSICS-
CiteScore
1.70
自引率
22.20%
发文量
31
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 Peoples’ 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
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