Recent Submissions

  • The singular Weinstein conjecture 

    Miranda Galcerán, Eva; Oms, Cedric (2020-06-04)
    External research report
    Open Access
    In this article, we investigate Reeb dynamics on $b^m$-contact manifolds, previously introduced in \cite{MO}, which are contact away from a hypersurface $Z$ but satisfy certain transversality conditions on $Z$. The study ...
  • A b-symplectic slice theorem 

    Dempsey Bradell, Roisin Mary; Kiesenhofer, Anna; Miranda Galcerán, Eva (2020-09)
    External research report
    Open Access
    In this article, motivated by the study of symplectic structures on manifolds with bound-ary and the systematic study ofb-symplectic manifolds started in [10], we prove a slice theorem forLie group actions onb-symplectic manifolds
  • The geometry and topology of contact structures with singularities 

    Miranda Galcerán, Eva; Oms, Cedric (2020-05-20)
    External research report
    Open Access
    In this article we introduce and analyze in detail singular contact structures, with an emphasis on $b^m$-contact structures, which are tangent to a given smooth hypersurface $Z$ and satisfy certain transversality conditions. ...
  • Bernstein's inequality and holonomicity for certain singular rings 

    Álvarez Montaner, Josep; Jeffries, Jack; Núñez-Betancourt, Luis; Hernández, Daniel J.; Teixeira, Pedro; Witt, Emily E. (2021)
    External research report
    Open Access
    In this manuscript we prove the Bernstein inequality and develop the theory of holonomic D-modules for rings of invariants of finite groups in characteristic zero, and for strongly F-regular finitely generated graded ...
  • Bernstein-Sato functional equations, V-filtrations, and multiplier ideals of direct summands 

    Álvarez Montaner, Josep; Jeffries, Jack; Núñez-Betancourt, Luis (2019)
    External research report
    Open Access
    This paper investigates the existence and properties of a Bernstein– Sato functional equation in nonregular settings. In particular, we construct D-modules in which such formal equations can be studied. The existence of ...
  • Poincaré series of multiplier and test ideals 

    Álvarez Montaner, Josep; Núñez-Betancourt, Luis (2021)
    External research report
    Open Access
    We prove the rationality of the Poincaré series of multiplier ideals in any dimension and thus extending the main results for surfaces of Galindo and Monserrat and Alberich-Carramiñana et al. Our results also hold for ...
  • Bass numbers of local cohomology of cover ideals of graphs 

    Álvarez Montaner, Josep; Sohrabi, Fatemeh (2019)
    External research report
    Open Access
    We develop splitting techniques to study Lyubeznik numbers of cover ideals of graphs which allow us to describe them for large families of graphs including forests, cycles, wheels and cactus graphs. More generally we are ...
  • Local cohomology of binomial edge ideals and their generic ideals 

    Álvarez Montaner, Josep (2019)
    External research report
    Open Access
    We provide a Hochster type formula for the local cohomology modules of binomial edge ideals. As a consequence we obtain a simple criterion for the Cohen-Macaulayness of these ideals and we describe their Castelnuovo-Mumford ...
  • A surprising fact about D-modules in characteristic p>0 

    Álvarez Montaner, Josep; Planas Vilanova, Francesc d'Assís (2004)
    External research report
    Open Access
    Let R = k[x1, . . . , xd] be the polynomial ring in d independent variables, where k is a field of characteristic p > 0. Let DR be the ring of k-linear differential operators of R and let f be a polynomial in R. In this ...
  • Divisors of expected Jacobian type 

    Álvarez Montaner, Josep; Planas Vilanova, Francesc d'Assís (2020)
    External research report
    Open Access
    Divisors whose Jacobian ideal is of linear type have received a lot of attention recently because of its connections with the theory of D-modules. In this work we are interested on divisors of expected Jacobian type, that ...
  • Rigidity of cotangent lifts and integrable systems 

    Mir Garcia, Pau; Miranda Galcerán, Eva (2020-05)
    External research report
    Open Access
    In this article we generalize a theorem by Palais on the rigidity ofcompact group actions to cotangent lifts. We use this result to prove rigidity forintegrable systems on symplectic manifolds including sytems with ...
  • b-Structures on Lie groups and Poisson reduction 

    Dempsey Bradell, Roisin Mary; Kiesenhofer, Anna; Miranda Galcerán, Eva (2020-09)
    External research report
    Open Access
    We introduce the notion of b-Lie group as a pair(G, H) where Gis a Lie group and H is a codimension-one Lie subgroup, and study the associated canonical b-symplectic structure on the b-cotangent bundle bT*G together with ...

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