A theory of type-II minimally modified gravity
A theory of type-II minimally modified gravity
复制标题
II型微修正重力理论
DOI:
10.1088/1475-7516/2020/09/034
复制
发表时间:
2020
影响因子:
6.4
通讯作者:
Mukohyama Shinji
中科院分区:
文献类型:
--
作者:
Felice Antonio De;Doll Andreas;Mukohyama Shinji
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.
影响因子:
6.4
作者:
R. Carballo;F. Filippo;S. Liberati
通讯作者:
S. Liberati
影响因子:
5
作者:
Feng, Justin C.;Carloni, Sante
通讯作者:
Carloni, Sante
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
Kazufumi Takahashi;Hayato Motohashi;Teruaki Suyama;and Tsutomu Kobayashi;高橋一史;Kazufumi Takahashi;高橋一史
通讯作者:
高橋一史