Exploració per tema "Àrees temàtiques de la UPC::Física::Astronomia i astrofísica::Cosmologia i cosmogonia"
Ara es mostren els items 1-20 de 40
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A review of quintessential inflation
(2021-12)
Article
Accés obertSome of the most important quintessential inflation scenarios, such as the Peebles–Vilenkin model, are described in detail. These models are able to explain the early- and late-time accelerated expansions of our universe, ... -
a-attractors in quintessential inflation motivated by supergravity
(American Physical Society, 2021-06-15)
Article
Accés obertAn exponential kind of quintessential inflation potential motivated by supergravity is studied. This type belongs to the class of a-attractor models. The model was studied for the first time by Dimopoulos and Owen in [J. ... -
Analytic formula to calculate the reheating temperature via gravitational particle production in smooth nonoscillating backgrounds
(American Physical Society, 2023-03-15)
Article
Accés obertWe present for smooth nonoscillating backgrounds an analytic formula which calculates the energy density of massive and massless particles created via gravitational particle production, thus giving the corresponding reheating ... -
Axions and the luminosity function of white dwarfs : the thin and thick discs, and the halo
(Oxford University Press, 2018-08-01)
Article
Accés obertThe evolution of white dwarfs is a simple gravothermal process of cooling. Since the shape of their luminosity function is sensitive to the characteristic cooling time, it is possible to use its slope to test the existence ... -
Cosmologia: passat, present i futur de l'univers
(2010-05-04)
Audiovisual
Accés obertLa Cosmologia se centra en l'estudi del passat, present i futur de l'univers. Des d'antany respón a aquestes preguntes, ha estat una de les grans motivacions de la humanitat. Quina és la destinació de l'Univers?. La resposta.... -
Cosmology intertwined: a review of the particle physics, astrophysics, and cosmology associated with the cosmological tensions and anomalies
(2022-06)
Article
Accés obertThe standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good description of a wide range of astrophysical and cosmological data. However, there are a few big open questions that make the standard model look ... -
Finite-time cosmological singularities and the possible fate of the Universe
(Elsevier, 2023-09-14)
Article
Accés restringit per política de l'editorialSingularities in any physical theory are either remarkable indicators of the unknown underlying fundamental theory, or indicate a change in the description of the physical reality. In General Relativity there are three ... -
Funció de distribució de les velocitats de les estrelles a l'entorn del Sol
(2011-03-30)
Altres
Accés obert -
Homothetic motions and Newtonian cosmology
(2014-05-07)
Article
Accés restringit per política de l'editorialWe construct a homothetic covariant Newtonian gravitation theory which unifies inertial homothetic forces and gravitational fields. This is achieved through an equivalence principle based on a local homothetic frame of ... -
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 ... -
La eterna historia
(1995-12)
Article
Accés obert -
La gran calabaza
(2015-12)
Article
Accés obert -
La paradoja del Big Bang
(2014-05)
Article
Accés obert -
Local behaviour of evaporating stars and black holes around the total evaporation event
(2010-06-21)
Article
Accés obert -
Low-thrust station-keeping control for lunar near rectilinear halo orbits
(Springer Nature, 2023-04-01)
Article
Accés obertThis paper studies a low-thrust station-keeping of near rectilinear halo orbits in the Earth–Moon quasi-bicircular dynamical model, and it is illustrated using resonant near rectilinear halo orbits as nominal orbits. The ... -
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 ... -
Monte Carlo simulations of the post-common envelope white dwarf-main sequence binary population
(2010)
Comunicació de congrés
Accés obert -
Multibersoaren bila
(2010-03)
Article
Accés obert -
Non-extensive statistics to the cosmological lithium problem
(2017-01-11)
Article
Accés obertBig Bang nucleosynthesis (BBN) theory predicts the abundances of the light elements D, 3He, 4He, and 7Li produced in the early universe. The primordial abundances of D and 4He inferred from observational data are in good ... -
Nucleosynthesis during the merger of white dwarfs and the origin of R Coronae Borealis stars
(2011-08-20)
Article
Accés restringit per política de l'editorialMany hydrogen-deficient stars are characterized by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger ...