219 citations · 2.2k across the 94 of their papers we have counts for
96 papers
Robustness of the primordial power spectrum in hybrid loop quantum cosmology to approximations near the bounce
Kristina Giesel, Almudena Guillén, Guillermo A. Mena Marugán +1
We prove the robustness of the analytic approximation used in (hybrid) loop quantum cosmology to compute the primordial power spectrum of the cosmological perturbations for a recen…
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…
Hamiltonian formalism, master functions and Darboux transformations for perturbed (interiors and exteriors of) nonrotating black holes
Michele Lenzi, Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez +1
Motivated by their relevance to the interior of nonrotating black holes, classical and quantum Kantowski-Sachs cosmologies have recently attracted increasing attention. This intere…
Parametrization of the primordial power spectrum in loop quantum cosmology
Almudena Guillén, Kai Langer, Guillermo A. Mena Marugán +2
We investigate the imprints on the angular power spectra of cosmological perturbations of a pre-inflationary bounce phase, as described by the hybrid and dressed metric approaches…
Master functions and hybrid quantization of perturbed nonrotating black hole interiors
Michele Lenzi, Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez
Master functions of black holes are fundamental tools in gravitational-wave physics and are typically derived within a Lagrangian framework. Starting from the Kantowski-Sachs geome…
Polar perturbations in Kantowski-Sachs spacetimes and hybrid quantum cosmology
Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez
Increasing attention has been recently devoted to the study of Kantowski-Sachs spacetime as a way to explore the interior of a Schwarzschild black hole. In this work, we construct…
Computing the graph-changing dynamics of loop quantum gravity
Thiago L. M. Guedes, Guillermo A. Mena Marugán, Francesca Vidotto +1
In loop quantum gravity (LQG), states of the gravitational field are represented by labeled graphs called spin networks. Their dynamics can be described by a Hamiltonian constraint…
Choice of vacuum state and the relation between inflationary and Planck scales
Maciej Kowalczyk, Guillermo A. Mena Marugán
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…
Comparing Analytic and Numerical Studies of Tensor Perturbations in Loop Quantum Cosmology
Guillermo A. Mena Marugán, Antonio Vicente-Becerril, Jesús Yébana Carrilero
We investigate the implications of different quantization approaches in Loop Quantum Cosmology for the primordial power spectrum of tensor modes. Specifically, we consider the hybr…
Analytic and Numerical Study of Scalar Perturbations in Loop Quantum Cosmology
Guillermo A. Mena Marugán, Antonio Vicente-Becerril, Jesús Yébana Carrilero
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 t…
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…
Axial perturbations in Kantowski-Sachs spacetimes and hybrid quantum cosmology
Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez
Recently, there has been a growing interest in investigating homogeneous but anisotropic spacetimes owing to their relation with nonrotating, uncharged black hole interiors. We pre…
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…
Effects of the inflaton potential on the primordial power spectrum in Loop Quantum Cosmology scenarios
Beatriz Elizaga Navascués, Guillermo A. Mena Marugán, Jesús Yébana Carrilero
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…
Analytic Primordial Power Spectrum in the Dressed Metric Approach to Loop Quantum Cosmology and Thermodynamics of Spacetime
Ana Alonso-Serrano, Guillermo A. Mena Marugan, Antonio Vicente-Becerril
We investigate the primordial power spectrum of cosmological tensor perturbations in the dressed metric approach to Loop Quantum Cosmology. We compute the background-dependent effe…
Extended phase space quantization of a black hole interior model in Loop Quantum Cosmology
Beatriz Elizaga Navascués, Guillermo A. Mena Marugán, Andrés Mínguez Sánchez
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 reinvigo…
Mass of cosmological perturbations in the hybrid and dressed metric formalisms of Loop Quantum Cosmology for the Starobinsky and exponential potentials
Simon Iteanu, Guillermo A. Mena Marugán
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 th…
Hamiltonian formulation and loop quantization of a recent extension of the Kruskal spacetime
Beatriz Elizaga Navascués, Alejandro García-Quismondo, Guillermo A. Mena Marugán
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…
Two-time alternative to the Ashtekar-Olmedo-Singh black hole interior
Alejandro García-Quismondo, Guillermo A. Mena Marugán
We investigate the viability of a recently proposed generalization of the Ashtekar-Olmedo-Singh spacetime for the effective description of the interior region of a Schwarzschild bl…
Space of solutions of the Ashtekar-Olmedo-Singh effective black hole model
Beatriz Elizaga Navascués, Alejandro García-Quismondo, Guillermo A. Mena Marugán
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 spacet…
Exploring alternatives to the Hamiltonian calculation of the Ashtekar-Olmedo-Singh black hole solution
Alejandro García-Quismondo, Guillermo A. Mena Marugán
In this article, we reexamine the derivation of the dynamical equations of the Ashtekar-Olmedo-Singh black hole model in order to determine whether it is possible to construct a Ha…
Non-oscillating vacuum states and the quantum homogeneity and isotropy hypothesis in Loop Quantum Cosmology
Beatriz Elizaga Navascués, Guillermo A. Mena Marugán, Santiago Prado
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 per…
Primordial perturbations in kinetically dominated regimes of general relativity and hybrid quantum cosmology
Beatriz Elizaga Navascués, Rafael Jiménez-Llamas, Guillermo A. Mena Marugán
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 p…
Analytical investigation of pre-inflationary effects in the primordial power spectrum: From General Relativity to hybrid Loop Quantum Cosmology
Beatriz Elizaga Navascués, Guillermo A. Mena Marugán
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 pri…