"The challenge of finding a satisfactory theory of quantum

gravity has stimulated theoretical physics for many

decades. We expect that such a theory should make sense

of the quantum fluctuations of the space-time metric at

low-energy scales, while providing a quantum mechanical

completion of the system at short distances. Recently, a

new approach to this long-standing puzzle has been proposed

[1,2]. In this approach, gravity is treated using the

traditional path integral methods of quantum field theory,

but without assuming Lorentz invariance as a fundamental

symmetry at short distances. The gauge symmetries are

those space-time diffeomorphisms that preserve a preferred

foliation of space-time by fixed time slices ..."

However, the paper is inconclusive apparently not able to account for dark energy.

"They prevented the Einstein-Hilbert term and the cosmological

constant term from being generated ..."

Emergent gravity at a Lifshitz point from a Bose liquid on the lattice

Cenke Xu

Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Petr Hor?ava

Berkeley Center for Theoretical Physics, University of California, Berkeley, California 94720, USA,

Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA,

and Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa 277-8568, Japan

(Received 28 March 2010; published 17 May 2010)

Phys Rev D May 15, 2010

Written by Jack Sarfatti

Published on Friday, 28 May 2010 20:33

Hits: 1675