We study the temperature corrections to the induced Newton constant. We obtain the Einstein action from an effective action of matter at finite temperature by means of the heat kernel expansion method. We find that the induced gravitational constant decreases as the temperature becomes higher. In the second part of the paper we investigate the consequences of this behaviour on the black-hole thermodynamics. We deduce the existence of a minimum mass and entropy corresponding to the maximum allowed temperature for the black hole.
We give a critical overview of various attempts to describe gravity as an emergent phenomenon, starting from examples of condensed matter physics, to arrive to more sophisticated pregeometric models. The common line of thought is to view the graviton as a composite particle/collective mode. However, we will describe many different ways in which this idea is realized in practice.
We report enhancement of the mechanical stability of graphene through a one-step method to disperse gold nanoparticles on the pristine graphene without any added agent.