Journal
PHYSICAL REVIEW D
Volume 88, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.88.043013
Keywords
-
Funding
- Science and Technology Facilities Council [ST/I00162X/1, ST/J001651/1, ST/I001166/1, ST/J001422/1] Funding Source: researchfish
- STFC [ST/J001422/1, ST/J001651/1, ST/I001166/1, ST/I00162X/1] Funding Source: UKRI
Ask authors/readers for more resources
There is growing interest in testing alternative gravity theories using the subtle gravitational redshifts in clusters of galaxies. However, current models all neglect a transverse Doppler redshift of similar magnitude, and some models are not self-consistent. An equilibrium model would fix the gravitational and transverse Doppler velocity shifts to be about 6 sigma(2)/c and 3 sigma(2)/2c in order to fit the observed velocity dispersion sigma self-consistently. This result comes from the virial theorem for a spherical isotropic cluster, and is insensitive to the theory of gravity. A gravitational redshift signal also does not directly distinguish between the Einsteinian and f(R) gravity theories, because each theory requires a different dark halo mass function to keep the clusters in equilibrium. When this constraint is imposed, the gravitational redshift has no sensitivity to theory. Indeed, our N-body simulations show that the halo mass function differs in f(R), and that the transverse Doppler effect is stronger than analytically predicted due to nonequilibrium.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available