群场论宇宙学中的有效各向异性动力学

IF 3.6 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Classical and Quantum Gravity Pub Date : 2024-08-29 DOI:10.1088/1361-6382/ad70ed

Daniele Oriti and Yi-Li Wang

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引用次数: 0

摘要

我们在群场论凝聚宇宙学的背景下研究了各向异性宇宙的突发动力学，标量场扮演了关系时钟的角色。根据 "各向同性 "的不同定义，我们考虑了两种各向异性的凝聚态，并分析了宇宙学各向异性观测值的类比动力学及其量子波动。我们发现，这两种各向异性态在晚期变得各向同性，重现了有效的弗里德曼动力学，而各向异性态在早期（更接近宇宙反弹）的贡献很小，但不可忽略。

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Effective anisotropic dynamics in group field theory cosmology

We study the emergent dynamics of an anisotropic Universe in the context of group field theory condensate cosmology, with a scalar field playing the role of a relational clock. According to different definitions of ‘isotropy’, two anisotropic condensate states are considered and the Bianchi-like dynamics of cosmological anisotropic observables, as well as their quantum fluctuations, are analysed. We find that both anisotropic states become isotropic at late time, reproducing an effective Friedmann dynamics, while anisotropies give small but non-negligible contributions at earlier times, closer to the cosmic bounce.

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来源期刊

Classical and Quantum Gravity 物理-天文与天体物理

CiteScore

7.00

自引率

8.60%

发文量

301

审稿时长

2-4 weeks

期刊介绍： Classical and Quantum Gravity is an established journal for physicists, mathematicians and cosmologists in the fields of gravitation and the theory of spacetime. The journal is now the acknowledged world leader in classical relativity and all areas of quantum gravity.