Enviaments recents

  • Phylogenetic mixtures and linear invariants for equal input models 

    Casanellas Rius, Marta; Steel, Mike (2016-09-07)
    Article
    Accés restringit per política de l'editorial
    The reconstruction of phylogenetic trees from molecular sequence data relies on modelling site substitutions by a Markov process, or a mixture of such processes. In general, allowing mixed processes can result in different ...
  • Simple inflationary quintessential model. II. Power law potentials 

    Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (American Physical Society, 2016-09-21)
    Article
    Accés obert
    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 ...
  • Weakly Hamilltonian actions 

    Miranda Galcerán, Eva; Martinez Torres, David (2016)
    Article
    Accés obert
    In this paper we generalize constructions of non-commutati ve integrable systems to the context of weakly Hamiltonian actions on Poisson manifolds. In particular we prove that abelian weakly Hamil tonian actions on ...
  • A note on the symplectic topology of b-manifolds 

    Miranda Galcerán, Eva; Martinez Torres, David; Frejlich, Pedro (2016)
    Article
    Accés obert
    Poisson manifold (M2n; ) is b-symplectic if Vn is transverse to the zero section. In this paper we apply techniques native to Symplectic Topology to address questions pertaining to b-symplectic manifolds. We pro- vide ...
  • Cotangent models of integrable systems 

    Miranda Galcerán, Eva; Kiesenhofer, Anna (2016-07)
    Article
    Accés obert
    We associate cotangent models to a neighbourhood of a Liouville torus in symplectic and Poisson manifolds focusing on b-Poisson/b-symplectic manifolds. The semilocal equivalence with such models uses the corresponding ...
  • Weakly Hamiltonian actions 

    Miranda Galcerán, Eva; Martinez Torres, David (2016)
    Article
    Accés obert
    n this paper we generalize constructions of non-commutative in- tegrable systems to the context of weakly Hamiltonian actions on Poisson manifolds. In particular we prove that abelian weakly Hamiltonian actions ...
  • Examples of integrable and non-integrable systems on singular symplectic manifolds 

    Miranda Galcerán, Eva; Delshams Valdés, Amadeu; Kiesenhoferb, Anna (2016)
    Article
    Accés obert
    We present a collection of examples borrowed from celestial mechanics and projective dynamics. In these examples symplectic structures with singularities arise naturally from regularization transformations, Appell’s ...
  • Simple inflationary quintessential model 

    Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (2016-04-12)
    Article
    Accés obert
    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 ...
  • Invariant versus classical quartet inference when evolution is heterogeneous across sites and lineages 

    Fernández Sánchez, Jesús; Casanellas Rius, Marta (2016)
    Article
    Accés obert
    One reason why classical phylogenetic reconstruction methods fail to correctly infer the underlying topology is because they assume oversimplified models. In this article, we propose a quartet reconstruction method consistent ...
  • 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
    Accés obert
    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 ...

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