Loop quantum gravity as an effective theory - INSPIRE

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Loop quantum gravity as an effective theory

Martin Bojowald
(
- Penn State U.
)

Aug, 2012

30 pages

Part of Proceedings, 6th International School on Field Theory and Gravitation (ISFTG 2012) : Petropolis, Rio de Janeiro, Brazil, April 23-27, 2012, 5-30

Published in:

AIP Conf.Proc. 1483 (2012) 1, 5-30

Contribution to:

- ISFTG 2012
, 5-30

Published: Sep 24, 2012

e-Print:

1208.1463 [gr-qc]

DOI:

10.1063/1.4756960

View in:

ADS Abstract Service

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Abstract: (AIP)

As a canonical and generally covariant gauge theory, loop quantum gravity requires special techniques to derive effective actions or equations. If the proper constructions are taken into account, the theory, in spite of considerable ambiguities at the dynamical level, allows for a meaningful phenomenology to be developed, by which it becomes falsifiable. The traditional problems plaguing canonical quantum-gravity theories, such as the anomaly issue or the problem of time, can be overcome or are irrelevant at the effective level, resulting in consistent means of physical evaluations. This contribution presents aspects of canonical equations and related notions of (deformed) space-time structures and discusses implications in loop quantum gravity, such as signature change at high density from holonomy corrections, and falsifiability thanks to inversetriad corrections.

Note:

30 pages, lecture series at Sixth International School on Field Theory and Gravitation 2012 (Petropolis, Brazil)

02.40.-k
04.60.Pp
gauge field theory
quantum gravity
space-time configurations
quantum gravity: loop space
holonomy: correction
density: high
gauge field theory
effective action

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