Testing gravity with the cosmic microwave background: constraints on modified gravity with two tensorial degrees of freedom
Testing gravity with the cosmic microwave background: constraints on modified gravity with two tensorial degrees of freedom
复制标题
用宇宙微波背景测试重力:两个张量自由度的修正重力约束
DOI:
10.1088/1475-7516/2022/07/040
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发表时间:
2022
影响因子:
6.4
通讯作者:
Kobayashi Tsutomu
中科院分区:
文献类型:
--
作者:
Hiramatsu Takashi;Kobayashi Tsutomu
We provide a cosmological test of modified gravity with two tensorial degrees of freedom and no extra propagating scalar mode. The theory of gravity we consider admits a cosmological model that is indistinguishable from the ΛCDM model at the level of the background evolution. The model has a single modified-gravity parameter β, the effect of which can be seen in linear perturbations, though no extra scalar mode is propagating. Using the Boltzmann code modified to incorporate the present model, we derive the constraints-0.047< β<-0.028 at 68% confidence from Planck CMB data. Since our modified gravity model can hardly be constrained by the Solar System tests and gravitational-wave propagation, our result offers the first observational test on the model.
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