Now showing items 1-12 of 12

  • Agujeros negros: espacio-tiempo al límite 

    Emparán, Roberto (2014-10-01)
    Audiovisual
    Open Access
  • Bouncing loop quantum cosmology in Gauss-Bonnet gravity 

    Haro Cases, Jaume; Makarenko, A. M.; Myagky, A. N.; Odintsov, Sergei D.; Oikonomou, V. K. (American Physical Society, 2015-12-11)
    Article
    Open Access
    We develop an effective Gauss-Bonnet extension of loop quantum cosmology, by introducing holonomy corrections in modified F(G) theories of gravity. Within the context of our formalism, we provide a perturbative expansion ...
  • Gravitational particle production in bouncing cosmologies 

    Haro Cases, Jaume; Elizalde, Emilio (2015-10-13)
    Article
    Restricted access - publisher's policy
    © 2015 IOP Publishing Ltd and Sissa Medialab srl . It is argued that the Universe reheating in bouncing cosmologies could be explained via gravitational particle production, as due to a sudden phase transition in the ...
  • Homothetic motions and Newtonian cosmology 

    Jaen Herbera, Javier; Molina Compte, Alfred (2014-05-07)
    Article
    Restricted access - publisher's policy
    We 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 ...
  • On the meaning of Painlevé–Gullstrand synchronization 

    Jaen Herbera, Javier; Molina Compte, Alfred (2015-11-19)
    Article
    Open Access
    Following on from two recent papers, here we examine the relationship between Newtonian gravitation and general relativity in more depth. This allows us to define a scalar potential which is just the proper time of the ...
  • On the quantum corrected gravitational collapse 

    Torres Herrera, Ramon; Fayos Vallés, Francisco (Elsevier, 2015-06-09)
    Article
    Open Access
    Based on a previously found general class of quantum improved exact solutions composed of non-interacting (dust) particles, we model the gravitational collapse of stars. As the modeled star collapses a closed apparent ...
  • Oxygen neutronization in accreting white dwarfs 

    Bravo Guil, Eduardo; Isern Vilaboy, Jordi; Labay, Javier; Canal Masgoret, Ramon (1983)
    Article
    Open Access
    Solid carbon-oxygen white dwarf cores have been shown to be likely initial configurations for collapse to neutron star densities. Solidification seems to entail carbon/oxygen separation, with oxygen settling at the star's ...
  • Pulsar-based Navigation 

    Hernández Pajares, Manuel (2014-10-10)
    External research report
    Open Access
  • Singularity-free gravitational collapse and asymptotic safety 

    Torres Herrera, Ramon (Elsevier, 2014-06-02)
    Article
    Open Access
    A general class of quantum improved stellar models with interiors composed of non-interacting (dust) particles is obtained and analyzed in a framework compatible with asymptotic safety. First, the effective exterior, based ...
  • Teoría de la relatividad general: 100 años de las ecuaciones de Einstein de la gravitación 

    Román Roy, Narciso (2015-11-25)
    Audiovisual
    Open Access
    El 25 de novembre de 1915, Albert Einstein va presentar la forma final de les equacions de camp de la Gravitació en l'Acadèmia Prussiana de Ciències de Berlín, culminant d'aquesta manera la seva Teoria de la Relativitat ...
  • The hidden Ionosphere: frequent waves, solar flare reaction and higher order effects 

    Hernández Pajares, Manuel; García Rigo, Alberto; Aragón Angel, Angela (2014-06-26)
    External research report
    Open Access
  • Viability of the matter bounce scenario in F(T) gravity and Loop Quantum Cosmology forgeneral potentials 

    Haro Cases, Jaume; Amorós Torrent, Jaume (2014-12-01)
    Article
    Open Access
    We 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 ...