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http://arstechnica.com/science/news/2009/03/loop-quantum-gravity-getting-closer-to-reality.ars

re: Phys. Rev. Lett. 102, 091301 (2009) [4 pages]
Towards Loop Quantum Gravity without the Time Gauge

Francesco Cianfrani
ICRA-International Center for Relativistic Astrophysics, Physics Department (G9), University of Roma “Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy

Giovanni Montani
ICRA-International Center for Relativistic Astrophysics, Physics Department (G9), University of Roma “Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy
ENEA C.R. Frascati (Dipartimento F.P.N.), via Enrico Fermi 45, 00044 Frascati, Rome, Italy
ICRANET C. C. Pescara, Piazzale della Repubblica, 10, 65100 Pescara, Italy
Received 25 July 2008; published 4 March 2009

The Hamiltonian formulation of the Holst action is reviewed and it provides a solution of second-class constraints corresponding to a generic local Lorentz frame. Within this scheme the form of rotation constraints can be reduced to a Gauss-like one by a proper generalization of Ashtekar-Barbero-Immirzi connections. This result emphasizes that the loop quantum gravity quantization procedure can be applied when the time-gauge condition does not stand.

©2009 The American Physical Society
 

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