Phase structure and graviton propagators in lattice formulations of four-dimensional quantum gravity

Details Phase structure and graviton propagators in lattice formulations of four-dimensional quantum gravity Phase structure and graviton propagators in lattice formulations of four-dimensional quantum gravity

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cqgra..16.1163r&link_type=abstract

Classical and Quantum Gravity, Volume 16, Issue 4, pp. 1163-1173 (1999).

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Scientific paper

We examine the phase structure of standard Regge calculus in four dimensions and compare our Monte Carlo results with those of the 0264-9381/16/4/006/img1-Regge model as well as with another formulation of lattice gravity derived from group-theoretical considerations. Within all of the three models of quantum gravity we find an extension of the well-defined phase to negative gravitational couplings and a new phase transition. In contrast to the well known transition at positive coupling there is evidence for a continuous phase transition which is essential for a continuum limit. We calculate two-point functions between geometrical quantities at the corresponding critical point and estimate the masses of the respective interaction particles.

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