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Barceló, C. ; Garay Elizondo, Luis Javier ; Gonzalez Diaz, P. F. ; Mena Marugán, Guillermo A. | Amer Physical Soc | 1996-03-15Starting with a procedure for dealing with general asymptotic behavior, we construct a quantum theory for asymptotically anti-de Sitter wormholes. We follow both the path integral formalism and the algebraic quantization program proposed by Asht[...]texto impreso
Garay Elizondo, Luis Javier ; González Díaz, Pedro F. ; Mena Marugán, Guillermo A. ; Raya, José M. | Amer Physical Soc | 1997-06-15The quantization of circular strings in an anti-de Sitter background spacetime is performed, obtaining a discrete spectrum for the string mass. A comparison with a four-dimensional homogeneous and isotropic spacetime coupled to a conformal scala[...]texto impreso
Alonso Serrano, Ana ; Garay Elizondo, Luis Javier ; Mena Marugán, Guillermo A. | American Physical Society | 2014Different spacetime regions separated by horizons are not related to each other. We know that this statement holds for classical spacetimes. In this paper we carry out a canonical quantization of a Kantowski-Sachs minisuperspace model whose clas[...]texto impreso
Borrajo Gutierrez, Daniel ; Ruiz Cembranos, José Alberto ; Garay Elizondo, Luis Javier ; Sánchez Velázquez, José Manuel | Springer | 2020-09-09Gravitational particle production in the early universe is due to the coupling of matter fields to curvature. This coupling may include derivative terms that modify the kinetic term. The most general first order action contains derivative coupli[...]texto impreso
The canonical structure of higher dimensional pure Chern-Simons theories is analyzed. It is shown that these theories have generically a nonvanishing number of local degrees of freedom, even though they are obtained by means of a topological con[...]texto impreso
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Ruiz Cembranos, José Alberto ; Garay Elizondo, Luis Javier ; Sánchez Velázquez, José Manuel | Springer | 2020-06-12We investigate the gravitational production of scalar dark matter particles during the inflationary and reheating epochs. The oscillatory behavior of the curvature scalarRduring the reheating phase generates two different enhancement mechanisms [...]texto impreso
Given a field vacuum state in a black hole spacetime, this state can be analysed in terms of how it is perceived (in terms of particle content) by different observers. This can be done by means of the effective-temperature function introduced by[...]texto impreso
Wormhole boundary conditions for the Wheeler-DeWitt equation can be derived from the path integral formulation. It is proposed that the wormhole wave function must be square integrable in the maximal analytic extension of minisuperspace. Quantum[...]texto impreso
Barceló, Carlos ; Carballo- Rubio, Raúl ; Garay Elizondo, Luis Javier ; Gómez Escalante, Ricardo | American Physical Society | 2012-10-22We reappraise some of the hybrid classical-quantum models proposed in the literature with the goal of retrieving some of their common characteristics. In particular, first, we analyze in detail the Peres-Terno argument regarding the inconsistenc[...]texto impreso
Martin Benito, M. ; Garay Elizondo, Luis Javier ; Mena Marugán, Guillermo A. | Amer Physical Soc | 2008-10We quantize an inhomogeneous cosmological model using techniques that include polymeric quantization. More explicitly, we construct well-defined operators to represent the constraints and find the physical Hilbert space formed by their solutions[...]texto impreso
We 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[...]texto impreso
The Immirzi ambiguity arises in loop quantum gravity when geometric operators are represented in terms of different connections that are related by means of an extended Wick transform. We analyze the action of this transform in gravity coupled w[...]texto impreso
Garay Elizondo, Luis Javier ; Martin Benito, M. ; Mena Marugán, Guillermo A. | Amer Physical Soc | 2010-08-30The Gowdy cosmologies provide a suitable arena to further develop loop quantum cosmology, allowing the presence of inhomogeneities. For the particular case of Gowdy spacetimes with the spatial topology of a three-torus and a content of linearly [...]texto impreso
We consider the quantum gravity and cosmology of a Jordan-Brans-Dicke theory, predicted by string effective actions. We study its canonical formalism and find that the constraint algebra is that of general relativity, as a consequence of the gen[...]
