Lessons from Classical Gravity about the Quantum Structure of Spacetime

Details Lessons from Classical Gravity about the Quantum Structure of Spacetime Lessons from Classical Gravity about the Quantum Structure of Spacetime

2010-12-20

arxiv.org/abs/1012.4476v2

J.Phys.Conf.Ser.306:012001,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Expanded version of the lectures given on several occasions including (i) Plenary talk at ERE 2010, Granada, September 2010; (

Scientific paper

10.1088/1742-6596/306/1/012001

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.

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