Zobrazeno 1 - 10
of 178
pro vyhledávání: '"Navascués, Beatriz"'
Publikováno v:
Phys. Rev. D 110, 085002 (2024)
Investigations into Hawking radiation often assume a black hole model featuring an event horizon, despite the growing consensus that such causal structures may not exist in nature. While this assumption is not crucial for deriving the local propertie
Externí odkaz:
http://arxiv.org/abs/2407.03031
Autor:
Navascués, Beatriz Elizaga
Publikováno v:
Class. Quantum Grav. 41, 145004, 2024
The dynamics of the expectation value of the volume is one of the key ingredients behind the replacement of the Big Bang singularity by a bounce in Loop Quantum Cosmology. As such, it is of great importance that this quantity is mathematically well-d
Externí odkaz:
http://arxiv.org/abs/2311.18066
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
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:
Phys. Rev. D 106, 043531 (2022)
We study the Hamiltonian formulation of the Ashtekar-Olmedo-Singh model for the description of the interior geometry of non-rotating, uncharged black holes. This model incorporates loop quantum effects through the introduction of two regularization p
Externí odkaz:
http://arxiv.org/abs/2208.00425
Publikováno v:
Phys. Rev. D 106, 063516 (2022)
We consider a general choice of integration constants in the resolution of the dynamical equations derived from a recently proposed effective model that describes black hole spacetimes in the context of loop quantum cosmology. The interest of our ana
Externí odkaz:
http://arxiv.org/abs/2207.04677
Publikováno v:
Phys. Rev. D 104, 083541 (2021)
We study the compatibility of the quantum homogeneitiy and isotropy hypothesis (QHIH), proposed by Ashtekar and Gupt to restrict the choice of vacuum state for the cosmological perturbations in Loop Quantum Cosmology (LQC), with the requirement that
Externí odkaz:
http://arxiv.org/abs/2107.11054
Publikováno v:
Phys. Rev. D 104, 103520 (2021)
Scalar fields with an energy density dominated by its kinetic part may have played a relevant role in the very early stages of the Universe. Compared to the standard inflationary paradigm, they may lead to modifications in observable quantities, e.g.
Externí odkaz:
http://arxiv.org/abs/2106.05628
Publikováno v:
JCAP 09(2021)030
This work is an analytical study of the main differences between classical inflationary effects of a fast-roll regime and imprints of hybrid Loop Quantum Cosmology (LQC) on the primordial power spectrum. Effective LQC solutions of phenomenological in
Externí odkaz:
http://arxiv.org/abs/2104.15002