Now showing items 21-29 of 29

    • Qualitative study in loop quantum cosmology 

      Aresté Saló, Llibert; Amorós Torrent, Jaume; Haro Cases, Jaume (2017-12-07)
      Article
      Open Access
      This 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 ...
    • Rigid covariance as a natural extension of Painleve-Gullstrand space-times: gravitational waves 

      Jaen Herbera, Javier; Molina Compte, Alfred (2017-08-01)
      Article
      Open Access
      The group of rigid motions is considered to guide the search for a natural system of space-time coordinates in General Relativity. This search leads us to a natural extension of the space-times that support Painlevé–Gullstrand ...
    • Singularities and qualitative study in LQC 

      Aresté Saló, Llibert (Universitat Politècnica de Catalunya, 2017-01)
      Bachelor thesis
      Open Access
      We will perform a detailed analysis of singularities in Einstein Cosmology and in LQC (Loop Quantum Cosmology). We will obtain explicit analytical expressions for the energy density and the Hubble constant for a given set ...
    • Space-time Schrödinger symmetries of a post-Galilean particle 

      Batlle Arnau, Carles; Gomis Torné, Joaquin (Springer, 2020-08-07)
      Article
      Open Access
      We study the space-time symmetries of the actions obtained by expanding the action for a massive free relativistic particle around the Galilean action [1]. We obtain all the point space-time symmetries of the post-Galilean ...
    • 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 Dapor–Liegener model of loop quantum cosmology: a dynamical analysis 

      Haro Cases, Jaume (Springer, 2018-11-01)
      Article
      Open Access
      The 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 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
    • L'únivers a través del temps 

      Elizalde, Emili (2014-02-22)
      Audiovisual
      Open Access
    • Viable inflationary evolution from Einstein frame loop quantum cosmology 

      Haro Cases, Jaume; Odintsov, Sergei D.; Oikonomou, V. K. (American Physical Society (APS), 2018-04-27)
      Article
      Open Access
      In this work we construct a bottom-up reconstruction technique for loop quantum cosmology scalar-tensor theories, from the observational indices. Particularly, the reconstruction technique is based on fixing the functional ...