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arXiv 2007.10850gr-qcastro-ph.CO
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标量张量引力理论中慢卷暴胀的形式化

Formalizing Slow-roll Inflation in Scalar-Tensor Theories of Gravitation

Kemal Akın, A. Savaş Arapoğlu, A. Emrah Yükselci

摘要:

考虑标量-张量引力理论中相空间的结构,考察了慢滚近似的可行性,并以时空曲率的非极小耦合标量场为例进行了分析.在约当标架下,通过两种方法得到了慢滚场方程:一是将最小耦合情形下的慢滚条件直接推广到非最小耦合情形;二是将Einstein标架下的慢滚场方程共形变换到约当标架上,然后应用推广的慢滚条件。基于最近的观测数据对$n_s$和$r$值的分析,考虑了由势$V(ϕ) \propto ϕ^2$和$V(ϕ) \propto ϕ^4$控制的两种暴胀模型,比较了两种方法的结果.

英文摘要:

The viability of slow-roll approximation is examined by considering the structure of phase spaces in scalar-tensor theories of gravitation and the analysis is exemplified with a nonminimally coupled scalar field to the spacetime curvature. The slow-roll field equations are obtained in the Jordan frame in two ways: first using the direct generalization of the slow-roll conditions in the minimal coupling case to nonminimal one, and second, conformal transforming the slow-roll field equations in the Einstein frame to the Jordan frame and then applying the generalized slow-roll conditions. Two inflationary models governed by the potentials $V(ϕ) \propto ϕ^2$ and $V(ϕ) \propto ϕ^4$ are considered to compare the outcomes of two methods based on the analysis of $n_s$ and $r$ values in the light of recent observational data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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