Lessons from Classical Gravity about the Quantum Structure of Spacetime
arXiv:1012.4476 · doi:10.1088/1742-6596/306/1/012001
Abstract
I present the theoretical evidence which suggests that gravity is an emergent phenomenon like gas dynamics or elasticity with the gravitational field equations having the same status as, say, the equations of fluid dynamics/elasticity. This paradigm views a wide class of gravitational theories - including Einstein's theory - as describing the thermodynamic limit of the statistical mechanics of "atoms of spacetime". The evidence for this paradigm is hidden in several classical features of the gravitational theories and depends on just one quantum mechanical input, viz. the existence of Davies-Unruh temperature of horizons. I discuss several conceptual ingredients of this approach.
Expanded version of the lectures given on several occasions including (i) Plenary talk at ERE 2010, Granada, September 2010; (ii) Keynote address at DICE 2010, Castiglioncello, September 2010; (iii) Special Lecture at the Indian Academy of Sciences, Bangalore, July 2010; ver2: Sec 6 made clearer
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