Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/12/011
Keywords
dark energy theory; modified gravity; cosmological parameters from CMBR
Funding
- Japan Society for the Promotion of Science [20K03969, 17H02890, 17H06359]
- World Premier International Research Center Initiative, MEXT, Japan
- Japanese Government (MEXT) scholarship
- Grants-in-Aid for Scientific Research [20K03969] Funding Source: KAKEN
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The Minimal theory of Massive Gravity (MTMG) includes two tensor modes in the gravity sector with non-zero mass, showing self-accelerating and normal branches with constraints on the graviton mass for the latter branch giving an upper bound at 95%CL as mu(0) < 8.4 x 10(-34) eV.
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 ACDM; 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 no, finding that (mu(0)/H-0)(2) = 0.119(-0.098)(+0.12) at 68% CL, which in turn gives an upper bound at 95% CL as mu(0) < 8.4 x 10(-34) eV. This corresponds to the strongest bound on the mass of the graviton for the normal branch of MTMG.
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