Zobrazeno 1 - 10
of 153
pro vyhledávání: '"Marugan, Guillermo A. Mena"'
We investigate the implications of different quantization approaches in Loop Quantum Cosmology for the primordial power spectrum of tensor modes. Specifically, we consider the hybrid and dressed metric approaches to derive the effective mass that gov
Externí odkaz:
http://arxiv.org/abs/2409.18302
Recent observations about the cosmic microwave background evidence a clear discrepancy between the scale of inflation and the Planck scale expected in the conventional inflationary picture, based on simple chaotic inflationary models. This paper expl
Externí odkaz:
http://arxiv.org/abs/2409.15886
The possibility that quantum geometry effects may alleviate the apparent tensions existing at large angular scales in the observations of the Cosmic Microwave Background explains the increasing interest in considering primordial perturbations within
Externí odkaz:
http://arxiv.org/abs/2404.04595
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 unitarily equivalent Fock representations that are invariant under the
Externí odkaz:
http://arxiv.org/abs/2403.03601
Publikováno v:
Phys. Rev. D 109, 106009 (2024)
Recently, there has been a growing interest in investigating homogeneous but anisotropic spacetimes owing to their relation with nonrotating, uncharged black hole interiors. We present a description of axial perturbations for a massless scalar field
Externí odkaz:
http://arxiv.org/abs/2402.08307
Publikováno v:
Phys. Rev. D 108, 083521 (2023)
In scenarios of physical interest in Loop Quantum Cosmology, with a preinflationary epoch where the kinetic energy of the inflaton dominates, the analytic study of the dynamics of the primordial fluctuations has been carried out by neglecting the inf
Externí odkaz:
http://arxiv.org/abs/2307.12026
We investigate the primordial power spectrum of cosmological tensor perturbations in the dressed metric approach to Loop Quantum Cosmology. We compute the background-dependent effective mass that affects their propagation using the effective descript
Externí odkaz:
http://arxiv.org/abs/2307.06813
Autor:
Cortez, Jerónimo, Navascués, Beatriz Elizaga, Marugán, Guillermo A. Mena, Torres-Caballeros, Alvaro, Velhinho, José M.
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 ultraviolet behavior. A time-dependent canonical transformation is perform
Externí odkaz:
http://arxiv.org/abs/2307.03636
Publikováno v:
Phys. Rev. D 108, 106001 (2023)
Considerable attention has been paid to the study of the quantum geometry of nonrotating black holes within the framework of Loop Quantum Cosmology. This interest has been reinvigorated since the introduction of a novel effective model by Ashtekar, O
Externí odkaz:
http://arxiv.org/abs/2306.06090
Publikováno v:
Universe 8, 463 (2022)
The hybrid and the dressed metric formalisms for the study of primordial perturbations in Loop Quantum Cosmology lead to dynamical equations for the modes of these perturbations that are of a generalized harmonic-oscillator type, with a mass that dep
Externí odkaz:
http://arxiv.org/abs/2208.01987