Exploració per autor "Haro Cases, Jaume"
Ara es mostren els items 25-44 de 64
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Inflation and late-time acceleration from a double-well potential with cosmological constant
(2016-06-01)
Article
Accés obertA model of a universe without big bang singularity is presented, which displays an early inflationary period ending just before a phase transition to a kination epoch. The model produces enough heavy particles so as to ... -
Inflationary potential as seen from different angles: model compatibility from multiple CMB missions
(IOP Publishing, 2023-09)
Article
Accés obertThe cosmic microwave background (CMB) temperature and polarization anisotropies, as observed by independent astronomical missions such as WMAP, Planck, and most recently the Atacama Cosmology Telescope and the South Pole ... -
Limiting curvature mimetic gravity and its relation to Loop Quantum Cosmology
(2019-04-01)
Article
Accés obertConsidering as usual that the underlying geometry of our universe is well described by the spatially flat Friedmann–Lemaître–Robertson–Walker line element, we review how the background of holonomy corrected Loop Quantum ... -
Matter Bounce Scenario in F(T) gravity
(2016)
Article
Accés obertIt is shown that teleparallel F(T) theories of gravity combined with holonomy corrected Loop Quantum Cosmology (LQC) support a Matter Bounce Scenario (MBS) which is a potential alternative to the inflationary paradigm. The ... -
Nonsingular models of universes in teleparallel theories
(2013-02-14)
Article
Accés obertDifferent models of universes are considered in the context of teleparallel theories. Assuming that the universe is filled by a fluid with an equation of state P ¼ f ð Þ , for different teleparallel theories ... -
Note on bouncing backgrounds
(American Physical Society (APS), 2018-05-15)
Article
Accés obertThe theory of inflation is one of the fundamental and revolutionary developments of modern cosmology that became able to explain many issues of the early Universe in the context of the standard cosmological model (SCM). ... -
Note on the reheating temperature in Starobinsky-type potentials
(Springer Nature, 2020-12)
Article
Accés obertThe relation between the reheating temperature, the number of e-folds and the spectral index is shown for the Starobinsky model and some of its descendants through a very detailed calculation of these three quantities. The ... -
On the hole argument and the physical interpretation of general relativity
(2024-02)
Article
Accés obertEinstein presented the Hole Argument against General Covariance, understood as invariance with respect to a change in coordinates, as a consequence of his initial failure to obtain covariant equations that, in the weak ... -
Project of the academic performance improvement
(Universitat Politècnica de Catalunya, 2022-09)
Text en actes de congrés
Accés obertThe transition of students from high school to university is a changing and complicated stage. It is during the initial phase when most drop-outs from engineering degrees occur. There are several reasons for this, however, ... -
Proyecto de mejora del rendimiento académico. Fase Inicial : primer curso del Grado de Ingeniería de la ESEIAAT
(Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2021-05)
Article
Accés obertLa transición del alumnado del instituto a la universidad es compleja y costosa. Durante las fases iniciales es donde se producen la mayor parte de los abandonos en las titulaciones de ingeniería. Los motivos son varios, ... -
Qualitative study in loop quantum cosmology
(2017-12-07)
Article
Accés obertThis work contains a detailed qualitative analysis, in general relativity and in loop quantum cosmology, of the dynamics in the associated phase space of a scalar field minimally coupled with gravity, whose potential mimics ... -
Quintessential inflation and cosmological seesaw mechanism: reheating and observational constraints
(2021-07)
Article
Accés obertRecently a new kind of quintessential inflation coming from the Lorentzian distribution has been introduced in [1,2]. The model leads to a very simple potential, which basically depends on two parameters, belonging to the ... -
Quintessential inflation at low reheating temperatures
(2017-11-23)
Article
Accés obertWe have tested some simple quintessential inflation models, imposing the requirement that they match with the recent observational data provided by the BICEP and Planck team and leading to a reheating temperature, which ... -
Quintessential inflation for exponential type potentials: scaling and tracker behavior
(springer-Verlag, 2021-02)
Article
Accés obertWe will show that for exponential type potentials of the form V(f)~e-¿fn/Mnpl, which are used to depict quintessential inflation, the solutions whose initial conditions take place during the slow roll phase in order to ... -
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 ...
