Minimal theory of massive gravity and constraints on the gravitonmass
Minimal theory of massive gravity and constraints on the gravitonmass
复制标题
大质量引力的最小理论和引力质量的约束
DOI：
10.1088/1475-7516/2021/12/011
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发表时间：
2021
影响因子：
6.4
通讯作者：
Pookkillath Masroor C.
中科院分区：
文献类型：
--
作者：
De Felice Antonio;Mukohyama Shinji;Pookkillath Masroor C.
最小质量引力理论（MTMG）被非线性地赋予在引力扇区中只有两个获得非零质量的张量模。在均匀和各向同性的背景下，该理论已知有两个分支：自加速分支，其宇宙学现象学，除了张量模的质量之外，与ΛCDM的现象学完全匹配;和正常的分支，相反，它在背景和线性扰动动力学方面表现出与广义相对论的偏离。对于后一个分支，我们使用几个早期和晚期数据进行研究，设定了对今天引力子质量μ 0值的约束，发现（μ 0/H 0）2= 0.119-0.098+ 0.12，CL为68%，这反过来又给出了95%CL的上限，μ 0< 8.4× 10-34 eV。这对应于MTMG正常分支中引力子质量的最强束缚。
The Minimal theory of Massive Gravity (MTMG) is endowed non-linearly with only two tensor modes in the gravity sector which acquire a non-zero mass. On a homogeneous and isotropic background the theory is known to possess two branches: the self-accelerating branch with a phenomenology in cosmology which, except for the mass of the tensor modes, exactly matches the one of ΛCDM; and the normal branch which instead shows deviation from General Relativity in terms of both background and linear perturbations dynamics. For the latter branch we study using several early and late times data sets the constraints on today's value of the graviton mass μ 0, finding that (μ 0/H 0) 2= 0.119-0.098+ 0.12 at 68% CL, which in turn gives an upper bound at 95% CL as μ 0< 8.4× 10-34 eV. This corresponds to the strongest bound on the mass of the graviton for the normal branch of MTMG.