带标量场的宇宙学标量和张量摄动：二次阶有效能量动量张量

IF 3.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Classical and Quantum Gravity Pub Date : 2025-10-07 DOI:10.1088/1361-6382/ae0aae

Inyong Cho

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引用次数: 0

摘要

我们引入了描述膨胀的标量场存在下的引力扰动的标量模和张量模。我们通过研究由线性扰动的二次项构造的二阶有效能量动量张量（2EMT）来研究扰动对背景的反作用力。由于标量模式，2EMT依赖于量规。我们得到了膨胀慢滚阶段的2EMT，并得到了它在纵向、空间平坦和共动三种规范条件下的宇宙学表达式。我们发现在2EMT中纯标量模部分在短波长范围内更强，而与张量模相关的部分（纯张量模部分和标量张量耦合部分）在长波长范围内更强。

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Cosmological scalar and tensor perturbations with a scalar field: quadratic-order effective energy-momentum tensor

We introduce the scalar and tensor modes of the gravitational perturbation in the presence of a scalar field which describes inflation. We investigate the back-reaction of the perturbations to the background by studying the effective energy-momentum tensor (2EMT) which is the second order constructed by the quadratic terms of the linear perturbations. 2EMT is gauge dependent due to the scalar mode. We obtain 2EMT in the slow-roll stage of inflation, and get its cosmological expressions in three (longitudinal, spatially flat, and comoving) gauge conditions. We find that the pure scalar-mode part in 2EMT is stronger in the short-wavelength limit, while the parts involved with the tensor mode (the pure tensor-mode part and the scalar-tensor coupled part) are stronger in the long-wavelength limit.

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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.