Matter in loop quantum gravity without time gauge: A nonminimally coupled scalar field

Francesco Cianfrani, Giovanni Montani

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We analyze the phase space of gravity nonminimally coupled to a scalar field in a generic local Lorentz frame. We reduce the set of constraints to a first class one by fixing a specific hypersurfaces in the phase space. The main issue of our analysis is to extend the features of the vacuum case to the presence of scalar matter by recovering the emergence of an SU(2) gauge structure and the nondynamical role of boost variables. Within this scheme, the supermomentum and the super-Hamiltonian are those ones associated with a scalar field minimally coupled to the metric in the Einstein frame. Hence, the kinematical Hilbert space is defined as in canonical loop quantum gravity with a scalar field, but the differences in the area spectrum are outlined to be the same as in the time-gauge approach. © 2009 The American Physical Society.
Original languageEnglish
Article number084045
Pages (from-to)-
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number8
Publication statusPublished - 29 Oct 2009
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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