TY - JOUR
T1 - Signature change in loop quantum gravity
T2 - Two-dimensional midisuperspace models and dilaton gravity
AU - Bojowald, Martin
AU - Brahma, Suddhasattwa
N1 - Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/6/15
Y1 - 2017/6/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85022342277&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85022342277&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.95.124014
DO - 10.1103/PhysRevD.95.124014
M3 - Article
AN - SCOPUS:85022342277
SN - 2470-0010
VL - 95
JO - Physical Review D
JF - Physical Review D
IS - 12
ER -