Status of Horava gravity: A personal perspective

Details Status of Horava gravity: A personal perspective Status of Horava gravity: A personal perspective

2011-03-29

arxiv.org/abs/1103.5587v2

Physics

High Energy Physics

High Energy Physics - Theory

V1: 11 pages. Based on a talk at the ERE2010 conference, Granada, Spain, September 2010. V2: three references added

Scientific paper

Horava gravity is a relatively recent (Jan 2009) idea in theoretical physics for trying to develop a quantum field theory of gravity. It is not a string theory, nor loop quantum gravity, but is instead a traditional quantum field theory that breaks Lorentz invariance at ultra-high (presumably trans-Planckian) energies, while retaining approximate Lorentz invariance at low and medium (sub-Planckian) energies. The challenge is to keep the Lorentz symmetry breaking controlled and small - small enough to be compatible with experiment. I will give a very general overview of what is going on in this field, paying particular attention to the disturbing role of the scalar graviton.

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