Exploració per autor "Haro Cases, Jaume"
Ara es mostren els items 39-58 de 64
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Reheating constraints in instant preheating
(American Physical Society, 2023-06-15)
Article
Accés obertWe use instant preheating as a mechanism to reheat the Universe when its evolution is modeled by a nonoscillating background. Once we obtain the reheating temperature, we calculate the number of e-folds using two different ... -
Reheating constraints in quintessential inflation
(2017-06-02)
Article
Accés obertWe study the consequences of reheating in quintessential inflation. From simple inflationary quintessential models introduced by de Haro, Amorós, and Pan in [Phys. Rev. D 93, 084018 (2016)] and [Phys. Rev. D 94, 064060 ... -
Reheating formulas in quintessential inflation via gravitational particle production
(American Physical Society, 2024-01-15)
Article
Accés obertWe calculate the reheating temperature in scenarios where heavy particles are gravitationally produced during a phase transition. We explore two distinct situations: the decay of these particles both during and after the ... -
Reheating in quintessential inflation via gravitational production of heavy massive particles: a detailed analysis
(2019-01-01)
Article
Accés obertAn improved version of the well-known Peebles-Vilenkin model unifying early inflationary era to current cosmic acceleration, is introduced in order to match with the theoretical values of the spectral quantities provided ... -
Reheating via gravitational particle production in simple models of quintessence or ¿CDM Inflation
(2017-11-14)
Article
Accés obertWe have tested some simple CDM (the same test is also valid for quintessence) inflation models, imposing that they match with the recent observational data provided by the BICEP and Planck’s team and leading to a reheating ... -
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 ... -
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 ... -
Teleparallel loop quantum cosmology in a system of intersecting branes
(Elsevier, 2016-09-10)
Article
Accés obertRecently, some authors have removed the big bang singularity in teleparallel Loop Quantum Cosmology (LQC) and have shown that the universe may undergo a number of oscillations. We investigate the origin of this type of ... -
The Dapor–Liegener model of loop quantum cosmology: a dynamical analysis
(Springer, 2018-11-01)
Article
Accés obertThe Dapor-Liegener model of loop quantum cosmology (LQC), which depicts an emergent universe from a de Sitter regime in the contracting phase is studied from the mathematical viewpoint of dynamical systems and compared ... -
The Lein-Gordon's field: a counter-example of the classical limit
(2000)
Article
Accés obertWe will study the Klein-Gordon's field with an homogeneous external potential, which does not depend on ħ. We will construct the Fock's space corresponding to our problem and we will see that there are phenomena of creation ... -
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 ... -
The Schwinger formula revisited II (a mathematical treatment).
(2003)
Article
Accés obertIn this paper we study the production of pairs in no-analytic potentials. It is a well-known fact that, when the potential is analytic the average number of produced pairs is exponentially small in ?. On the other hand, when ... -
The semiclassical theory of quantized fields in classical electromagnetic backgrounds
(2003)
Article
Accés obertWe show the mathematical formulation of the process of pair production in electromagnetic fields for spinless particles. We compute the probability that ? pairs are created in the semiclassical approximation, and we prove ... -
The spectrum of gravitational waves, their overproduction in quintessential inflation and its influence in the reheating temperature
(2020-06-01)
Article
Accés obertOne of the most important issues in an inflationary theory as standard or quintessential inflation is the mechanism to reheat the universe after the end of the inflationary period in order to match with the Hot Big Bang ... -
Theoretical and observational bounds on some interacting vacuum energy scenarios
(American Physical Society, 2021-04-15)
Article
Accés obertThe dynamics of interacting dark matter-dark energy models is characterized through an interaction rate function quantifying the energy flow between these dark sectors. In most of the interaction functions, the expansion ... -
Topics in cosmology — clearly explained by means of simple examples
(2022-03)
Article
Accés obertThis is a very comprehensible review of some key issues in modern cosmology. Simple mathematical examples and analogies are used, whenever available. The starting point is the well-known Big Bang cosmology (BBC). We deal ... -
Understanding gravitational particle production in quintessential inflation
(2019-06-01)
Article
Accés obertThe diagonalization method, introduced by a group of Russian scientists at the beginning of seventies, is used to compute the energy density of superheavy massive particles produced due to a sudden phase transition from ...
