Modified cosmology through Barrow entropy

Understand

We investigate the cosmological consequences of the modified Friedmann equations when the entropy associated with the apparent horizon, given by Barrow entropy, $S\sim A^{1+\delta/2}$, where $0\leq\delta\leq1$, represents the amount of the quantum-gravitational deformation of the horizon.

• We study implications of this model in a flat Friedmann-Robertson-Walker (FRW) universe with/without cosmological constant.
• Taking the cosmological constant into account, this model can describe the current accelerated expansion, although the transition from deceleration phase to the acceleration phase takes place in the lower redshifts.
• We investigate the evolution of the scale factor and show that with increasing $\delta$, the value of the scale factor increases as well.