Einstein-Regge equations in spinfoams - INSPIRE

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Einstein-Regge equations in spinfoams

Claudio Perini
(
- Penn State U.
)

Oct, 2011

4 pages

Part of Proceedings, International Conference on Non-perturbative / background independent quantum gravity (Loops 11) : Madrid, Spain, May 23-28, 2011

Published in:

J.Phys.Conf.Ser. 360 (2012) 012050

Contribution to:

Loops 11: International Conference on Quantum Gravity

e-Print:

1110.5899 [gr-qc]

DOI:

10.1088/1742-6596/360/1/012050

View in:

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Abstract: (arXiv)

We consider spinfoam quantum gravity on a spacetime decomposition with many 4-simplices, in the double scaling limit in which the Immirzi parameter

\gamma

is sent to zero (flipped limit) and the physical area in Planck units (

\gamma

times the spin quantum number

j

) is kept constant. We show that the quantum amplitude takes the form of a Regge-like path integral and enforces Einstein equations in the semiclassical regime. In addition to quantum corrections which vanish when the Planck constant goes to zero, we find new corrections due to the discreteness of geometric spectra which is controlled by the Immirzi parameter.

Note:

4 pages, based on a talk given at Loops '11 in Madrid, to appear in Journal of Physics: Conference Series (JPCS)

References(14)

Figures(0)

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