Einstein Gravity as an emergent phenomenon?

Details Einstein Gravity as an emergent phenomenon? Einstein Gravity as an emergent phenomenon?

2001-06-01

arxiv.org/abs/gr-qc/0106002v1

Int.J.Mod.Phys. D10 (2001) 799-806

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, Essay awarded an honorable mention in the year 2001 Gravity Research Foundation essay competition

Scientific paper

10.1142/S0218271801001591

In this essay we marshal evidence suggesting that Einstein gravity may be an emergent phenomenon, one that is not ``fundamental'' but rather is an almost automatic low-energy long-distance consequence of a wide class of theories. Specifically, the emergence of a curved spacetime ``effective Lorentzian geometry'' is a common generic result of linearizing a classical scalar field theory around some non-trivial background. This explains why so many different ``analog models'' of general relativity have recently been developed based on condensed matter physics; there is something more fundamental going on. Upon quantizing the linearized fluctuations around this background geometry, the one-loop effective action is guaranteed to contain a term proportional to the Einstein--Hilbert action of general relativity, suggesting that while classical physics is responsible for generating an ``effective geometry'', quantum physics can be argued to induce an ``effective dynamics''. This physical picture suggests that Einstein gravity is an emergent low-energy long-distance phenomenon that is insensitive to the details of the high-energy short-distance physics.

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