Masstemperature relation in Λ CDM and modified gravity
Abstract
We derive the masstemperature relation using an improved tophat model and a continuous formation model which takes into account the effects of the ordered angular momentum acquired through tidaltorque interaction between clusters, random angular momentum, dynamical friction, and modifications of the virial theorem to include an external pressure term usually neglected. We show that the masstemperature relation differs from the classical selfsimilar behavior, M ∝T^{3 /2} , and shows a break at 34 keV and a steepening with a decreasing cluster temperature. We then compare our masstemperature relation with those obtained in the literature with N body simulations for f (R ) and symmetron models. We find that the masstemperature relation is not a good probe to test gravity theories beyond Einstein's general relativity, because the masstemperature relation of the Λ CDM model is similar to that of the modified gravity theories.
 Publication:

Physical Review D
 Pub Date:
 July 2019
 DOI:
 10.1103/PhysRevD.100.024013
 arXiv:
 arXiv:1908.07322
 Bibcode:
 2019PhRvD.100b4013D
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 11 pages