Zobrazeno 1 - 10
of 213
pro vyhledávání: '"Olmedo, Javier"'
We provide a quantization of the Schwarzschild spacetime in the presence of a cosmological constant, based on midisuperspace methods developed in the spherically symmetric sector of loop quantum gravity, using in particular the 'improved dynamics' sc
Externí odkaz:
http://arxiv.org/abs/2408.04925
Autor:
Martín-Caro, Alberto García, García-Moreno, Gerardo, Olmedo, Javier, Velázquez, Jose M. Sánchez
Publikováno v:
Phys. Rev. D 110, 025007 (2024)
We present a detailed description of a quantum scalar field theory within a flat spacetime confined to a cavity with perfectly reflecting moving boundaries. Moreover, we establish an equivalence between this time-dependent setting and a field theory
Externí odkaz:
http://arxiv.org/abs/2404.06166
We provide the quantization of a charged black hole. We consider a redefinition of the scalar constraint in order to render the algebra of constraints as a Lie algebra. We apply loop quantum gravity techniques adhered to a novel improved dynamics sch
Externí odkaz:
http://arxiv.org/abs/2312.11450
Publikováno v:
International Journal of Modern Physics D 32, 2350101 (2023)
Vacuum spherically symmetric loop quantum gravity in the midi-superspace approximation using inhomogeneous horizon-penetrating slices has been studied for a decade, and it has been noted that the singularity is eliminated. It is replaced by a region
Externí odkaz:
http://arxiv.org/abs/2310.19922
Autor:
Martín-Caro, Alberto García, García-Moreno, Gerardo, Olmedo, Javier, Velázquez, Jose M. Sánchez
Publikováno v:
Phys. Rev. D 108, L061701 (2023)
We propose a setting that simulates Hawking radiation from an analogue bouncing geometry, i.e., a collapsing geometry that reverts its collapse after a finite time, in a setup consisting of a coplanar waveguide terminated in superconducting quantum-i
Externí odkaz:
http://arxiv.org/abs/2306.05250
Publikováno v:
Phys.Rev.D 108 (2023) 10, 103508
In this work we investigate observational signatures of a primordial power spectrum with exponential infrared suppression, motivated by the choice of a non-oscillatory vacuum in a bouncing and inflationary geometry within Loop Quantum Cosmology (LQC)
Externí odkaz:
http://arxiv.org/abs/2305.09599
There is rich literature on regular black holes from loop quantum gravity (LQG), where quantum geometry effects resolve the singularity, leading to a quantum extension of the classical space-time. As we will see, the mechanism that resolves the singu
Externí odkaz:
http://arxiv.org/abs/2301.01309
Publikováno v:
In: Bambi, C., Modesto, L., Shapiro, I. (eds) Handbook of Quantum Gravity. Springer, Singapore (2023)
We summarize our work on spherically symmetric midi-superspaces in loop quantum gravity. Our approach is based on using inhomogeneous slicings that may penetrate the horizon in case there is one and on a redefinition of the constraints so the Hamilto
Externí odkaz:
http://arxiv.org/abs/2211.05621
Publikováno v:
JCAP 10 (2022) 045
We calculate how primordial anisotropies in the background space-time affect the evolution of cosmological perturbations for bouncing alternatives to inflation, like ekpyrosis and the matter bounce scenario. We find that the leading order effect of a
Externí odkaz:
http://arxiv.org/abs/2206.04037
Autor:
del-Corral, Daniel, Olmedo, Javier
We study the quasinormal frequencies of three effective geometries of nonrotating regular black holes derived from loop quantum gravity. Concretely, we consider the Ashtekar-Olmedo-Singh and two Gambini-Olmedo-Pullin prescriptions. We compute the qua
Externí odkaz:
http://arxiv.org/abs/2201.09584