A theory of type-II minimally modified gravity

A theory of type-II minimally modified gravity
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II型微修正重力理论

DOI:
10.1088/1475-7516/2020/09/034
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发表时间:
2020
影响因子:
6.4
通讯作者:
Mukohyama Shinji
Mukohyama Shinji
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Felice Antonio De;Doll Andreas;Mukohyama Shinji

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我们提出了一个修正的引力理论,传播只有两个本地的引力自由度,并没有一个爱因斯坦框架。按照[2]的分类,这是一个Ⅱ型极小修正引力理论。该理论的特征在于引力常数G N和一个非动力学辅助场的函数V(λ),它扮演着暗能量的角色。一旦我们确定了一个均匀的和各向同性的宇宙学背景,V(π)的形式就确定了,并且理论除了G N之外不再具有自由参数或自由函数。当V '(ω)= 0时,理论简化为广义相对论,其中G N是牛顿常数,V= const是宇宙学常数。对于V ′(ω)ω 0,表明引力的行为与GR不同,但在距离和时间尺度比V(ω)的尺度短得多的情况下,对于弱引力,可以恢复以G N为牛顿常数的GR。因此,这个理论提供了宇宙学的最简单的框架,在这个框架中,对GR的偏离可以通过观测数据来检验。
We propose a modified gravity theory that propagates only two local gravitational degrees of freedom and that does not have an Einstein frame. According to the classification in [2], this is a type-II minimally modified gravity theory. The theory is characterized by the gravitational constant G N and a function V (ϕ) of a non-dynamical auxiliary field ϕ that plays the role of dark energy. Once one fixes a homogeneous and isotropic cosmological background, the form of V (ϕ) is determined and the theory no longer possesses a free parameter or a free function, besides G N. For V'(ϕ)= 0 the theory reduces to general relativity (GR) with G N being the Newton's constant and V= const. being the cosmological constant. For V'(ϕ)≠ 0, it is shown that gravity behaves differently from GR but that GR with G N being the Newton's constant is recovered for weak gravity at distance and time scales sufficiently shorter than the scale associated with V (ϕ). Therefore this theory provides the simplest framework of cosmology in which deviations from GR can be tested by observational data.
最小修改的引力理论:测试广义相对论独特性的游乐场
DOI: --
发表时间: 2018
影响因子: 6.4
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发表时间: 2020-03-03
期刊: PHYSICAL REVIEW D
影响因子: 5
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扩展 Cuscuton:配方和宇宙学
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