3 years ago

Probing Graviton mass using weak lensing and SZ effect in Galaxy Clusters.

Akshay Rana, Deepak Jain, Shobhit Mahajan, Amitabha Mukherjee

In General Relativity (GR), the graviton is massless. However, in several theoretical alternatives of GR, a common feature is a non-zero mass for the graviton. These theories can be described as massive gravity theories. The recent detection of gravitational waves from LIGO and VIRGO, which gives us an upper limit on the graviton mass, has led to a resurgence for graviton related studies. Giving mass to the graviton implies that the gravitational potential has the Yukawa form. The difference between the Newtonian and the Yukawa potentials becomes significant at large distances. We use this property of massive gravity theories to probe the mass of graviton. In this work, we use the mass estimates of galaxy clusters measured at various cosmologically defined radial distances measured via the weak lensing (WL) and Sunyaev-Zel'dovich (SZ) effect. Within $1\sigma$ confidence region, we obtain the mass of graviton $m_g < 5.9 \times 10^{-30}$ eV with the corresponding Compton length scale $\lambda_g > 6.82$ Mpc from weak lensing and $m_g < 8.31 \times 10^{-30}$ eV with $\lambda_g > 5.012$ Mpc from SZ effect. This analysis improves the upper bound on graviton mass obtained earlier from galaxy clusters.

Publisher URL: http://arxiv.org/abs/1801.03309

DOI: arXiv:1801.03309v1

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