Abstrakt
On one hand, the formalism developed in thermodynamics of spacetime allows a derivation of Einstein equations from the proportionality of entropy to the area. On the other hand, low energy quantum gravity effects imply a modified entropy formula with an additional term logarithmic in the area.
Combining both concepts, I will introduce the derivation of quantum modified gravitational dynamics from the modified entropy and discuss its main features. Moreover, I will show its physical implications on a simple cosmological model and show that it suggests the replacement of the Big Bang singularity by a regular bounce.
The talk is based on A. Alonso-Serrano, M.
Liška, "Quantum phenomenological gravitational dynamics: a general view from thermodynamics of spacetime", JHEP 2020, 196 (2020).