Exploració per autor "Amorós Torrent, Jaume"
Ara es mostren els items 31-47 de 47
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Scaling solutions in quintessential inflation
(springer-Verlag, 2020-05)
Article
Accés obertIn quintessence scalar field theories, the presence of scaling solutions are important during the radiation and matter epoch due to having their attractor character. Usually, it is assumed that the initial conditions of ... -
Simple inflationary quintessential model
(2016-04-12)
Article
Accés obertIn the framework of a flat Friedmann-Lemaitre-Robertson-Walker geometry, we present a nongeodesically past complete model of our Universe without the big bang singularity at finite cosmic time, describing its evolution ... -
Simple inflationary quintessential model. II. Power law potentials
(American Physical Society, 2016-09-21)
Article
Accés obertThe present work is a sequel of our previous work [Phys. Rev. D 93, 084018 (2016)] which depicted a simple version of an inflationary quintessential model whose inflationary stage was described by a Higgs-type potential ... -
Singular spectrum analysis filtering and Fourier inversion: an efficient and fast way to improve resolution and quality of current density maps with low-cost Hall scanning systems
(2019-01-01)
Article
Accés obertMeasurement Science and Technology Paper Singular spectrum analysis filtering and Fourier inversion: an efficient and fast way to improve resolution and quality of current density maps with low-cost Hall scanning systems ... -
Sudden singularities in semiclassical gravity
(2012-06-19)
Article
Accés restringit per política de l'editorialIt has been claimed in a recent paper [J. D. Barrow, A. B. Batista, J. C. Fabris, M. J. S. Houndjo, and G. Dito, Phys. Rev. D 84, 123518 (2011).] that sudden singularities will survive in semiclassical gravity. This issue ... -
Symplectic Lefschetz fibrations of curves as gonal coverings
(2013-08)
Article
Accés obertWe show that after a finite base change every symplectic Lefschetz fibration f : X ¿ B of genus g > 3 curves over a closed oriented surface becomes a finite covering of degree g 2 + 1 or g 2 + 32 of a family of spheres ... -
Symplectic Lefschetz fibrations with arbitrary fundamental groups.
(1998)
Article
Accés obertIn this paper we give an explicit costruction of a symplectic Lefschetz fibration whose total space is a smooth compact four dimensional manifold with a prescribed fundamental group. We also study the numerical properties ... -
The fundamental group of Kaehler manifolds
(1997)
Article
Accés obertIt studies the fundamental group of complex algebraic varieties, in its Betti, Hodge and de Rham realizations. This study has been carried out both in the absolute case, i.e. fundamental groups of such varieties, and in ... -
The matter-ekpyrotic bounce scenario in Loop Quantum Cosmology
(2017-09-01)
Article
Accés obertWe 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 scalar ... -
The Peebles–Vilenkin quintessential inflation model revisited
(springer-Verlag, 2019-06-01)
Article
Accés obertWe review the well-known Peebles–Vilenkin (PV) quintessential inflation model and discuss its possible improvements in agreement with the recent observations. The improved PV model depends only on two parameters: the ... -
TOPOLOGIA ALGEBRAICA (Examen 2n quadrim)
(Universitat Politècnica de Catalunya, 2007-06-01)
Examen
Accés restringit a la comunitat UPC -
Topologia Algebraica (Examen 2n quadrimestre)
(Universitat Politècnica de Catalunya, 2007-07-03)
Examen
Accés restringit a la comunitat UPC -
Topologia. Apunts
(Universitat Politècnica de Catalunya, 1998)
Apunts
Accés obert -
Understanding the phenomenology of interacting dark energy scenarios and their theoretical bounds
(American Physical Society (APS), 2020-06-15)
Article
Accés obertNongravitational interaction between dark matter and dark energy has been considered in a spatially flat Friedmann-Lemaître-Robertson-Walker (FLRW) universe. The interaction rate is assumed to be linear in the energy ... -
Viability of the Matter Bounce Scenario
(Institute of Physics (IOP), 2015)
Article
Accés obertIt is shown that teleparallel F(T) theories of gravity combined with Loop Quantum Cosmology support a Matter Bounce Scenario which is an alternative to the inflation scenario in the Big Bang paradigm. It is checked that ... -
Viability of the matter bounce scenario in Loop Quantum Cosmology from BICEP2 last data
(2014-08-12)
Article
Accés obertThe CMB map provided by the Planck project constrains the value of the ratio of tensor-to-scalar perturbations, namely r, to be smaller than 0.11 (95 % CL). This bound rules out the simplest models of inflation. However, ... -
Viability of the matter bounce scenario in F(T) gravity and Loop Quantum Cosmology forgeneral potentials
(2014-12-01)
Article
Accés obertWe consider the matter bounce scenario in F (T) gravity and Loop Quantum Cosmology (LQC) for phenomenological potentials that at early times provide a nearly matter dominated Universe in the contracting phase, having a ...
