Immirzi ambiguity, boosts and conformal frames for black holes

dc.contributor.authorGaray Elizondo, Luis Javier
dc.contributor.authorMena Marugán, Guillermo A.
dc.description© IOP Publishing. The authors acknowledge DGESIC for financial support under Research Project No. BFM2001-0213.
dc.description.abstractWe analyse changes of the Immirzi parameter in loop quantum gravity and compare their consequences with those of Lorentz boosts and constant conformal transformations in black-hole physics. We show that the effective value deduced for the Planck length in local measurements of vacuum black holes by an asymptotic observer may depend on its conformal or Lorentz frame. This introduces an apparent ambiguity in the expression of the black-hole entropy which is analogous to that produced by the Immirzi parameter. For quantities involving a notion of energy, the similarity between the implications of the Immirzi ambiguity and a conformal scaling disappears, but the parallelism with boosts is maintained.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
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dc.journal.titleClassical and quantum gravity
dc.publisherIOP Publishing Ltd
dc.rights.accessRightsopen access
dc.subject.ucmFísica-Modelos matemáticos
dc.subject.ucmFísica matemática
dc.titleImmirzi ambiguity, boosts and conformal frames for black holes
dc.typejournal article
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