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dc.contributorVirginia Tech
dc.contributor.authorFreidel, L.
dc.contributor.authorMinic, D.
dc.contributor.authorTakeuchi, T.
dc.date.accessioned2013-12-18T19:46:39Z
dc.date.available2013-12-18T19:46:39Z
dc.date.issued2005-11
dc.identifier.citationFreidel, L ; Minic, D ; Takeuchi, T, NOV 2005. “Quantum gravity, torsion, parity violation, and all that,” PHYSICAL REVIEW D 72(10): 104002. DOI: 10.1103/PhysRevD.72.104002en_US
dc.identifier.issn1550-7998
dc.identifier.urihttp://hdl.handle.net/10919/24745
dc.description.abstractWe discuss the issue of parity violation in quantum gravity. In particular, we study the coupling of fermionic degrees of freedom in the presence of torsion and the physical meaning of the Immirzi parameter from the viewpoint of effective field theory. We derive the low-energy effective Lagrangian which turns out to involve two parameters: one measuring the nonminimal coupling of fermions in the presence of torsion, the other being the Immirzi parameter. In the case of nonminimal coupling the effective Lagrangian contains an axial-vector interaction leading to parity violation. Alternatively, in the case of minimal coupling there is no parity violation and the effective Lagrangian contains only the usual axial-axial interaction. In this situation the real values of the Immirzi parameter are not at all constrained. On the other hand, purely imaginary values of the Immirzi parameter lead to violations of unitarity for the case of nonminimal coupling. Finally, the effective Lagrangian blows up for the positive and negative unit imaginary values of the Immirzi parameter.en_US
dc.language.isoen_US
dc.publisherAmerican Physical Society
dc.subjectspace
dc.subjectAstronomy & Astrophysics
dc.subjectPhysics
dc.titleQuantum gravity, torsion, parity violation, and all that
dc.typeArticle - Refereed
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevD.72.104002
dc.date.accessed2013-12-16
dc.title.serialPhysical Review D
dc.identifier.doihttps://doi.org/10.1103/PhysRevD.72.104002


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