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Torsional instanton effects in quantum gravity

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dc.contributor.authorKaul, Romesh K.
dc.contributor.authorSengupta, Sandipan
dc.date.accessioned2015-03-26T01:40:00Z
dc.date.available2015-03-26T01:40:00Z
dc.date.issued2014-12-29
dc.descriptionOpen Accessen
dc.description.abstractWe show that in the first-order gravity theory coupled to axions the instanton number of the Giddings-Strominger wormhole can be interpreted as the Nieh-Yan topological index. The axion charge of the baby universes is quantized in terms of the Nieh-Yan integers. Tunneling between universes of different Nieh-Yan charges implies a nonperturbative vacuum state. The associated topological vacuum angle can be identified with the Barbero-Immirzi parameter.en
dc.identifier.citationPhysical Review D, 2014, Vol. 90, p124081en
dc.identifier.issn1550-7998
dc.identifier.issn1550-2368(Online)
dc.identifier.urihttp://hdl.handle.net/2289/6208
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttp://arxiv.org/abs/1411.4793en
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.90.124081en
dc.relation.urihttp://adsabs.harvard.edu/abs/2014PhRvD..90l4081Ken
dc.rights2014 American Physical societyen
dc.titleTorsional instanton effects in quantum gravityen
dc.typeArticleen

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