Speaker
Hussain Gohar
(University of Szczecin, Poland)
Description
We formulate the basic framework of thermodynamical entropic force cosmology which allows
variation of the gravitational constant G and the speed of light c. Three different approaches to the
formulation of the field equations are presented. Some cosmological solutions for each framework
are given and one of them is tested against combined observational data (supernovae, BAO, and
CMB). From the fit of the data it is found that the Hawking temperature numerical coefficient γ is
two to four orders of magnitude less than usually assumed on the geometrical ground value of O(1)
and that it is also compatible with zero. Besides, in the entropic scenario we observationally test
that the fit of the data is allowed for the speed of light c growing and the gravitational constant
G diminishing during the evolution of the universe. We also obtain a bound on the variation of c
to be ∆c/c ∝ 10^−5 > 0 which is at least one order of magnitude weaker than the quasar spectra
observational bound.
Primary author
Hussain Gohar
(University of Szczecin, Poland)
