SISSA Open Science

Browsing SISSA Preprints by Title

Browsing SISSA Preprints by Title

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  • Fractional powers and singular perturbations of quantum differential Hamiltonians 
    Michelangeli, Alessandro; Ottolini, Andrea; Scandone, Raffaele (SISSA, 2018-01)
    We consider the fractional powers of singular (point-like) perturbations of the Laplacian and the singular perturbations of fractional powers of the Laplacian, and we compare two such constructions focusing on their ...
  • Fracture models for elasto-plastic materials as limits of gradient damage models coupled with plasticity: the antiplane case 
    Dal Maso, Gianni; Orlando, Gianluca; Toader, Rodica (SISSA, 2015-04)
    We study the asymptotic behavior of a variational model for damaged elastoplastic materials in the case of antiplane shear. The energy functionals we consider depend on a small parameter " , which forces damage concentration ...
  • Friedrichs systems in a Hilbert space framework: solvability and multiplicity 
    Antonić, Nenad; Erceg, Marko; Michelangeli, Alessandro (2017-04)
    The Friedrichs (1958) theory of positive symmetric systems of first order partial differential equations encompasses many standard equations of mathematical physics, irrespective of their type. This theory was recast in ...
  • Frobenius manifolds associated to Coxeter groups of type E_7 and E_8 
    Abriani, Devis (2010-02-05)
    Flat coordinates for Frobenius manifolds defined on the orbit space of a Coxeter group W are specified through a certain system of generators of W-invariant polynomials. In this note, starting from basic invariants proposed ...
  • From BRST to light-cone description of higher spin gauge fields 
    Barnich, Glenn; Bonelli, Giulio; Grigoriev, Maxim (2005)
    In this short note we show, at the level of action principles, how the lightcone action of higher spin gauge fields can easily be obtained from the BRST formulation through the elimination of quartets. We analyze how the ...
  • From current algebra for p-branes to topological M-theory 
    Bonelli, Giulio; Zabzine, Maxim (2005)
    In this note we generalize a result by Alekseev and Strobl for the case of $p$-branes. We show that there is a relation between anomalous free current algebras and "isotropic" involutive subbundles of $T\oplus \wedge^p ...
  • A Fully Coupled Immersed Finite Element Method for Fluid Structure Interaction via the Deal.II Library 
    Heltai, Luca; Roy, Saswati; Costanzo, Francesco (SISSA, 2012-09-13)
    We present the implementation of a solution scheme for fluid-structure interaction problems via the finite element software library deal.II. The solution scheme is an immersed finite element method in which two independent ...
  • A fully nonlinear potential model for ship hydrodynamics directly interfaced with CAD data structures 
    Mola, Andrea; Heltai, Luca; DeSimone, Antonio (SISSA, 2014-03)
    We present a model for ship hydrodynamics simulations currently under development at SISSA. The model employs potential flow theory and fully nonlinear free surface boundary conditions. The spatial discretization of the ...
  • Functional change of variables in the Wheeler-De Witt equation 
    Cavaglià, Marco (SISSA, 1993-04-30)
    I present a new way to solve the Wheeler-de Witt equation using the invariance of the classical lagrangian under reparametrization. This property allows one to introduce an arbitrary function for each degree of freedom ...
  • Fundamental strings in SFT 
    Bonora, Loriano; Maccaferri, Carlo; Scherer Santos, Ricardo Jose; Tolla, Driba Demissie (2005)
    In this letter we show that vacuum string field theory contains exact solutions that can be interpreted as macroscopic fundamental strings. They are formed by a condensate of infinitely many completely space-localized ...
  • Gamma-Convergence of Free-discontinuity problems 
    Cagnetti, Filippo; Dal Maso, Gianni; Scardia, Lucia; Zeppieri, Caterina Ida (SISSA, 2017-03-20)
    We study the Gamma-convergence of sequences of free-discontinuity functionals depending on vector-valued functions u which can be discontinuous across hypersurfaces whose shape and location are not known a priori. The main ...
  • Gauge Fields, Fermions and Mass Gaps in 6D Brane Worlds 
    Parameswaran, Susha L.; Randjbar-Daemi, S.; Salvio, Alberto (2006-09-07)
    We study fluctuations about axisymmetric warped brane solutions in 6D minimal gauged supergravity. Much of our analysis is general and could be applied to other scenarios. We focus on bulk sectors that could give rise to ...
  • Gauge/gravity duality and meta-stable dynamical supersymmetry breaking 
    Argurio, Riccardo; Bertolini, Matteo; Franco, Sebastian; Kachru, Shamit (2006-11-09)
    We engineer a class of quiver gauge theories with several interesting features by studying D-branes at a simple Calabi-Yau singularity. At weak 't Hooft coupling we argue using field theory techniques that these theories ...
  • Gel'fand-Zakharevich Systems and Algebraic Integrability: the Volterra Lattice Revisited 
    Falqui, Gregorio; Pedroni, Marco (2005-06-20)
    In this paper we will discuss some features of the bi-Hamiltonian method for solving the Hamilton-Jacobi (H-J) equations by Separation of Variables, and make contact with the theory of Algebraic Complete Integrability and, ...
  • Geodesics and admissible-path spaces in Carnot Groups 
    Agrachev, Andrei A.; Gentile, A.; Lerario, Antonio (SISSA, 2013-11-26)
    We study the topology of admissible-loop spaces on a step-two Carnot group G. We use a Morse-Bott theory argument to study the structure and the number of geodesics on G connecting the origin with a 'vertical' point ...
  • Geometric Confinement and Dynamical Transmission of a Quantum Particle in Grushin Cylinder 
    Gallone, Matteo; Michelangeli, Alessandro; Pozzoli, Eugenio (SISSA, 2019)
    We classify the self-adjoint realisations of the Laplace-Beltrami operator minimally defined on an infinite cylinder equipped with an incom-plete Riemannian metric of Grushin type, in the non-trivial class of metrics yielding ...
  • The geometry emerging from the symmetries of a quantum system 
    De Nittis, Giuseppe; Panati, Gianluca (2010-01-26)
    We investigate the relation between the symmetries of a quantum system and its topological quantum numbers, in a general C*-algebraic framework. We prove that, under suitable assumptions on the symmetry algebra, there ...
  • Ghost story. I. Wedge states in the oscillator formalism 
    Bonora, Loriano; Maccaferri, Carlo; Scherer Santos, Ricardo Jose; Tolla, Driba Demissie (2007-06-11)
    This paper is primarily devoted to the ghost wedge states in string field theory formulated with the oscillator formalism. Our aim is to prove, using such formalism, that the wedge states can be expressed as |n> = exp[{2-n}/2 ...
  • Glimm interaction functional for BGK schemes 
    Bianchini, Stefano (2005)
  • Global fits to neutrino oscillation data 
    Schwetz, Thomas (2006-06-13)
    I summarize the determination of neutrino oscillation parameters within the three-flavor framework from world neutrino oscillation data with date of May 2006, including the first results from the MINOS long-baseline ...

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