Timelike surfaces in Lorentz covariant loop gravity and spin foam models

Details Timelike surfaces in Lorentz covariant loop gravity and spin foam models Timelike surfaces in Lorentz covariant loop gravity and spin foam models

2005-01-28

arxiv.org/abs/gr-qc/0501093v2

Class.Quant.Grav. 22 (2005) 3491-3510

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

a wrong sign corrected in equation (65)

Scientific paper

10.1088/0264-9381/22/17/010

We construct a canonical formulation of general relativity for the case of a timelike foliation of spacetime. The formulation possesses explicit covariance with respect to Lorentz transformations in the tangent space. Applying the loop approach to quantize the theory we derive the spectrum of the area operator of a two-dimensional surface. Its different branches are naturally associated to spacelike and timelike surfaces. The results are compared with the predictions of Lorentzian spin foam models. A restriction of the representations labeling spin networks leads to perfect agreement between the states as well as the area spectra in the two approaches.

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