6 papers
Unitary implementability of Darboux transformations
Guillermo A. Mena Marugán, Alvaro Torres-Caballeros, José Velhinho
We investigate the unitary implementability of the canonical transformations corresponding to Darboux transformations in the Hamiltonian formalism recently developed for gauge inva…
Quasinormal modes in effective loop quantum gravity and consequences for isospectrality
Alejandro García-Quismondo, Guillermo A. Mena Marugán, Alvaro Torres-Caballeros
We investigate the quasinormal mode spectra of axial and polar perturbations about the effective Ashtekar, Olmedo, and Singh black hole geometry within the hybrid approach to loop…
Effective Regge-Wheeler equations of a hybrid loop quantum black hole
Beatriz Elizaga Navascués, Alvaro Torres-Caballeros
A set of effective equations for the gauge-invariant gravitational perturbations in the interior of a spherically symmetric, non-rotating black hole is derived within the framework…
Expansion-sensitive coupling of a local quantum system in de Sitter cosmology
Jorma Louko, Guillermo A. Mena Marugán, Alvaro Torres-Caballeros
When a local quantum system couples to a quantum field in a cosmological spacetime, the time dependence of the coupling strength is conventionally taken to reflect the design of th…
Time-dependent scalings and Fock quantization of a massless scalar field in Kantowski-Sachs
Jerónimo Cortez, Guillermo A. Mena Marugán, Alvaro Torres-Caballeros +1
We address the issue of inequivalent Fock representations in Quantum Field Theory in a curved homogenous and anisotropic background, namely Kantowski-Sachs spacetime. A family of u…
Fock quantization of a Klein-Gordon field in the interior geometry of a nonrotating black hole
Jerónimo Cortez, Beatriz Elizaga Navascués, Guillermo A. Mena Marugán +2
We study the canonical quantization of a scalar field in a Kantowski-Sachs spacetime. For simplicity, we consider compactified spatial sections, since this does not affect the ultr…