Compactification of anisotropies in Einstein-Scalar-Gauss-Bonnet cosmology

IF 2.8 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Alex Giacomini, Andronikos Paliathanasis, Alexey Toporensky
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引用次数: 0

Abstract

We investigate the evolution of anisotropies in Einstein-Gauss-Bonnet theory with a scalar field coupled to the Gauss-Bonnet term. Specifically, we examine the simplest scenario in which the scalar field lacks a kinetic term, and its kinetic contribution arises from an integration by parts of the Gauss-Bonnet scalar. We consider four- and five-dimensional anisotropic spacetimes, focusing on Bianchi I and extended Bianchi I geometries. Our study reveals that the asymptotic solutions correspond to locally symmetric spacetimes where at least two scale factors exhibit analogous behavior or, alternatively, to isotropic configurations where all scale factors evolve identically. Additionally, we discuss the effects of a cosmological constant, finding that the presence of the cosmological constant does not lead to an isotropic universe.

爱因斯坦-标量-高斯-邦纳宇宙论中各向异性的紧化
我们用标量场耦合高斯-博内项研究了爱因斯坦-高斯-博内理论中各向异性的演化。具体地说,我们研究了最简单的情况,其中标量场缺乏动力学项,其动力学贡献来自高斯-博内标量的部分积分。我们考虑四维和五维各向异性时空,重点关注Bianchi I和扩展Bianchi I几何。我们的研究表明,渐近解对应于局部对称时空,其中至少有两个尺度因子表现出类似的行为,或者对应于所有尺度因子进化相同的各向同性构型。此外,我们讨论了宇宙常数的影响,发现宇宙常数的存在不会导致一个各向同性的宇宙。
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来源期刊
General Relativity and Gravitation
General Relativity and Gravitation 物理-天文与天体物理
CiteScore
4.60
自引率
3.60%
发文量
136
审稿时长
3 months
期刊介绍: General Relativity and Gravitation is a journal devoted to all aspects of modern gravitational science, and published under the auspices of the International Society on General Relativity and Gravitation. It welcomes in particular original articles on the following topics of current research: Analytical general relativity, including its interface with geometrical analysis Numerical relativity Theoretical and observational cosmology Relativistic astrophysics Gravitational waves: data analysis, astrophysical sources and detector science Extensions of general relativity Supergravity Gravitational aspects of string theory and its extensions Quantum gravity: canonical approaches, in particular loop quantum gravity, and path integral approaches, in particular spin foams, Regge calculus and dynamical triangulations Quantum field theory in curved spacetime Non-commutative geometry and gravitation Experimental gravity, in particular tests of general relativity The journal publishes articles on all theoretical and experimental aspects of modern general relativity and gravitation, as well as book reviews and historical articles of special interest.
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