Monte Carlo studies of quantum cosmology by the generalized Lefschetz thimble method
Sign Up to like & getrecommendations! Published in 2024 at "Journal of High Energy Physics"
DOI: 10.1007/jhep05(2025)142
Abstract: Quantum cosmology aims at elucidating the beginning of our Universe. Back in early 80’s, Vilenkin and Hartle-Hawking put forward the “tunneling from nothing” and “no boundary” proposals. Recently there has been renewed interest in this… read more here.
Keywords: lefschetz thimble; cosmology; monte carlo; quantum cosmology ... See more keywords
Primordial power spectrum from the Dapor–Liegener model of loop quantum cosmology
Sign Up to like & getrecommendations! Published in 2018 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-018-2413-1
Abstract: We compute the predictions for the power spectrum of scalar perturbations from a recent new proposal for the effective Hamiltonian of loop quantum cosmology. The model provides an attractive picture of the early cosmos, in… read more here.
Keywords: cosmology; quantum cosmology; power spectrum; loop quantum ... See more keywords
Loop quantum cosmology and singularities
Sign Up to like & getrecommendations! Published in 2017 at "Scientific Reports"
DOI: 10.1038/s41598-017-06616-y
Abstract: Loop quantum gravity is believed to eliminate singularities such as the big bang and big crunch singularity. This belief is based on studies of so-called loop quantum cosmology which concerns symmetry-reduced models of quantum gravity.… read more here.
Keywords: cosmology singularities; cosmology; quantum cosmology; loop quantum ... See more keywords
Basis function method for numerical loop quantum cosmology: the Schwarzschild black hole interior
Sign Up to like & getrecommendations! Published in 2019 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ab514c
Abstract: Loop quantum cosmology is a symmetry-reduced application of loop quantum gravity that has led to the resolution of classical singularities such as the big bang, and those at the center of black holes. This can… read more here.
Keywords: method numerical; quantum; cosmology; quantum cosmology ... See more keywords
Minimal length effects on quantum cosmology and quantum black hole models
Sign Up to like & getrecommendations! Published in 2020 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ab6038
Abstract: A Kantowski-Sachs model with a modified quantization prescription is considered. Such quantization rules, inspired by the so-called Generalized Uncertainty Principle (GUP), correspond to a modified commutation relation between minisuperspace variables and their conjugate momenta. For… read more here.
Keywords: minimal length; cosmology; effects quantum; quantum cosmology ... See more keywords
The time-dependent mass of cosmological perturbations in loop quantum cosmology: Dapor–Liegener regularization
Sign Up to like & getrecommendations! Published in 2020 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/abac6d
Abstract: In this work, we compute the time-dependent masses that govern the dynamics of scalar and tensor perturbations propagating on an effective flat, homogeneous, and isotropic background within the framework of loop quantum cosmology, regularized according… read more here.
Keywords: cosmology; dapor liegener; quantum cosmology; time dependent ... See more keywords
The Born–Oppenheimer approach to quantum cosmology
Sign Up to like & getrecommendations! Published in 2021 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ac0a88
Abstract: The scope of this paper is to compare two different approaches for solving the Wheeler–DeWitt (WDW) equation in the presence of homogeneous matter (inflaton) and perturbations around it. The standard Born–Oppenheimer (BO) decomposition, which consists… read more here.
Keywords: approach quantum; born oppenheimer; cosmology; oppenheimer approach ... See more keywords
Lorentzian quantum cosmology goes simplicial
Sign Up to like & getrecommendations! Published in 2021 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ac42ad
Abstract: We employ the methods of discrete (Lorentzian) Regge calculus for analysing Lorentzian quantum cosmology models with a special focus on discrete analogues of the no-boundary proposal for the early universe. We use a simple four-polytope,… read more here.
Keywords: lorentzian quantum; cosmology goes; goes simplicial; cosmology ... See more keywords
The matter-ekpyrotic bounce scenario in Loop Quantum Cosmology
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2017/09/002
Abstract: We will perform a detailed study of the matter-ekpyrotic bouncing scenario in Loop Quantum Cosmology using the methods of the dynamical systems theory. We will show that when the background is driven by a single… read more here.
Keywords: scenario; cosmology; scenario loop; quantum cosmology ... See more keywords
Preinflationary dynamics in loop quantum cosmology: monodromy potential
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/11/003
Abstract: In this article we explore the pre-inflationary background dynamics of an FLRW universe sourced by a scalar field with monodromy potential in LQC framework. In particular we calculate the number of e-folds, Ninf, produced during… read more here.
Keywords: cosmology; dynamics loop; monodromy potential; quantum cosmology ... See more keywords
Constraints on non-minimal coupling from quantum cosmology
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/08/025
Abstract: Quantum cosmology is investigated in a de Sitter minisuperspace model with a quantized scalar field non-minimally coupled to curvature. Quantum states of the scalar field must satisfy the regularity condition, which requires that the probability… read more here.
Keywords: constraints non; field; cosmology; minimal coupling ... See more keywords