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Mostrando ítems 1-20 de 31

    • Bouncing cosmologies via modified gravity in the ADM formalism: Application to loop quantum cosmology 

      Haro Cases, Jaume; Amorós Torrent, Jaume (American Physical Society (APS), 2018-03-15)
      Artículo
      Acceso abierto
      We consider the Arnowitt-Deser-Misner formalism as a tool to build bouncing cosmologies. In this approach, the foliation of the spacetime has to be fixed in order to go beyond general relativity modifying the gravitational ...

    • Bouncing loop quantum cosmology from F(T) gravity 

      Amorós Torrent, Jaume; Haro Cases, Jaume; Odintsov, Sergei D. (2013-05)
      Artículo
      Acceso abierto
      The big bang singularity could be understood as a breakdown of Einstein’s general relativity at very high energies. By adopting this viewpoint, other theories that implement Einstein cosmology at high energies might solve ...

    • Generic behaviour of asymptotically holomorphic Lefschetz pencils 

      Amorós Torrent, Jaume; Muñoz, Vicente; Presas, Francisco (World Scientific, 2005)
      Artículo
      Acceso abierto
      We prove that the vanishing spheres of the Lefschetz pencils constructed by Donaldson on symplectic manifolds of any dimension are conjugated under the action of the symplectomorphism group of the fiber. More precisely, ...

    • GEOMETRIA DIFERENCIAL 

      Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 2019-05-21)
      Examen
      Acceso restringido a la comunidad UPC

    • GEOMETRIA DIFERENCIAL 

      Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 2018-05-01)
      Examen
      Acceso restringido a la comunidad UPC

    • GEOMETRIA DIFERENCIAL | EXTRAORDINARI 

      Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 2020-07-15)
      Examen
      Acceso restringido a la comunidad UPC

    • GEOMETRIA DIFERENCIAL | EXTRAORDINARI 

      Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 2019-07-07)
      Examen
      Acceso restringido a la comunidad UPC

    • GEOMETRIA DIFERENCIAL | FINAL 

      Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 2019-06-04)
      Examen
      Acceso restringido a la comunidad UPC

    • GEOMETRiA DIFERENCIAL | FINAL 

      Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 2020-06-15)
      Examen
      Acceso restringido a la comunidad UPC

    • Matter Bounce Scenario in F(T) gravity 

      Haro Cases, Jaume; Amorós Torrent, Jaume (2016)
      Artículo
      Acceso abierto
      It 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 

      Haro Cases, Jaume; Amorós Torrent, Jaume (2013-02-14)
      Artículo
      Acceso abierto
      Different 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 ...

    • On the Malcev completion of Kähler groups 

      Amorós Torrent, Jaume (1995)
      Artículo
      Acceso abierto

    • On the number of defining relations for nonfibered kaehler groups 

      Amorós Torrent, Jaume; Bauer-Catanese, Ingrid (1999-01)
      Artículo
      Acceso abierto
      We present minimal bounds for the deficiency (least difference between numbers of generators and relations among all presentations of a group) of fundamental groups of quasiprojective manifolds which do not fiber over a ...

    • Qualitative study in loop quantum cosmology 

      Aresté Saló, Llibert; Amorós Torrent, Jaume; Haro Cases, Jaume (2017-12-07)
      Artículo
      Acceso abierto
      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 ...

    • R+aR2 loop quantum cosmology 

      Amorós Torrent, Jaume; De Haro, Jaume; Odintsov, Sergei D. (2014-05-06)
      Artículo
      Acceso abierto
      Working in Einstein frame, we introduce, in order to avoid singularities, holonomy corrections to the f(R)=R+aR2 model. We perform a detailed analytical and numerical study when holonomy corrections are taken into account ...

    • Riemann i les funcions de variable complexa 

      Amorós Torrent, Jaume (2008-02-20)
      Audiovisual
      Acceso abierto
      Conferència enmarcada dintre de la Jornada Riemann

    • Scaling solutions in quintessential inflation 

      Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (springer-Verlag, 2020-05)
      Artículo
      Acceso abierto
      In 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 

      Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (2016-04-12)
      Artículo
      Acceso abierto
      In 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 

      Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (American Physical Society, 2016-09-21)
      Artículo
      Acceso abierto
      The 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 ...

    • Singular spectrum analysis filtering and Fourier inversion: an efficient and fast way to improve resolution and quality of current density maps with low-cost Hall scanning systems 

      Amorós Torrent, Jaume; Folch Duran, Arnau; Carrera Vilanova, Miquel; López López, José; Granados García, Javier A.J. (2019-01-01)
      Artículo
      Acceso abierto
      Measurement Science and Technology Paper Singular spectrum analysis filtering and Fourier inversion: an efficient and fast way to improve resolution and quality of current density maps with low-cost Hall scanning systems ...