General modified Friedmann equations in Rainbow flat universe, by thermodynamics
Department of Mathematics, Faculty of Sciences, Damascus University, Damascus, Syria
2 Physics Department, HIAST, P.O.Box 31983, Damascus, Syria
* e-mail: firstname.lastname@example.org
Accepted: 2 February 2019
Published online: 11 February 2019
We investigate the derivation of Friedmann equations in Rainbow gravity following Jacobson thermodynamic approach. We do not restrict the rainbow functions to be constant as is customarily used, and show that the first law of thermodynamics with a corresponding ‘classical’ proportionality between entropy and surface area, supplemented eventually by a ‘quantum’ logarithmic correction, are not in general sufficient to obtain the equations in flat FRW metrics.
© The Author(s), 2019