Signature change in loop quantum gravity: Two-dimensional midisuperspace models and dilaton gravity

Martin Bojowald, Suddhasattwa Brahma

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Models of loop quantum gravity based on real connections have a deformed notion of general covariance, which leads to the phenomenon of signature change. This result is confirmed here in a general analysis of all midisuperspace models without local degrees of freedom. As a subclass of models, two-dimensional theories of dilaton gravity appear, but a larger set of examples is possible based only on the condition of anomaly freedom. While the classical dilaton gravity models are the only such systems without deformed covariance, they do give rise to signature change when holonomy modifications are included.

Original languageEnglish (US)
JournalPhysical Review D
Volume95
Issue number12
DOIs
StatePublished - Jun 15 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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