Gravity, entropy, and cosmology: in search of clarity

The phase transition of corrected black hole with f(R) gravity

In this letter, we consider static black hole in f(R) gravity.We take advantage from corrected entropy and temperature and investigate such black hole. Finally, we study the $ P - V $ critically and phase transition of corrected black hole with respect to entropy and temperature. Here also, we obtain the heat capacity for the static black hole in $ f(R) $ gravity. This calculation help us...

Cosmology and entropy: in search of further clarity

The concept of cosmic entropy, and the purported need to explain the initial conditions of Friedmann-Robertson-Walker ‘Big Bang cosmology’, continue to cause confusion within the scientific community. David Wallace’s 2010 paper went some way towards disentangling this confusion, but left a number of significant issues unaddressed. The purpose of this paper is to define and resolve these issues....

Cosmology of F(T) Gravity and k-Essence

Exact Solutions in Modified Gravity Models

We review the exact solutions in modified gravity. It is one of the main problems of mathematical physics for the gravity theory. One can obtain an exact solution if the field equations reduce to a system of ordinary differential equations. In this paper we consider a number of exact solutions obtained by the method of separation of variables. Some applications to Cosmology and BH entropy are b...

Study of a Restricted Modified Gravity on astrophysical and cosmological scales

p { margin-bottom: 0in; direction: rtl; text-align: right; }p.ctl { font-size: 12pt; }a:link { color: rgb(0, 0, 255); } In this paper, we study a restricted modified gravity in which diffeomorphism symmetry is broken. We investigate the astrophysical implications of the model by using the corresponding gravitational potential. By using the weight function of the weak lensing , for the model,...