SISSA Open Sciencegeneral-feed.descriptionhttps://openscience.sissa.it2024-08-08T16:06:01Z2024-08-08T16:06:01Z5111On the Symmetry TFT of Yang–Mills–Chern–Simons theoryRiccardo Argurio, Francesco Benini, Matteo Bertolini, Giovanni Galati, Pierluigi Nirohttps://openscience.sissa.it/handle/1963/354722024-04-16T23:20:32Z2024-04-04T00:00:00Zdc.title: On the Symmetry TFT of Yang–Mills–Chern–Simons theory
dc.contributor.author: Riccardo Argurio, Francesco Benini, Matteo Bertolini, Giovanni Galati, Pierluigi Niro
dc.description.abstract: Three-dimensional Yang–Mills–Chern–Simons theory has the peculiar property that its one-form symmetry defects have non-trivial braiding, namely they are charged under the same symmetry they generate, which is then anomalous. This poses a few puzzles in describing the corresponding Symmetry TFT in a four-dimensional bulk. First, the braiding between lines at the boundary seems to be ill-defined when such lines are pulled into the bulk. Second, the Symmetry TFT appears to be too trivial to allow for topological boundary conditions encoding all the different global variants.
We show that both of these puzzles can be solved by including endable (tubular) surfaces in the lass of bulk topological operators one has to consider. In this way, we are able to reproduce all global variants of the theory, with their symmetries and their anomalies. We check the validity ofour proposal also against a top-down holographic realization of the same class of theories.
2024-04-04T00:00:00ZA closure theorem for gAMMA-convergence and H-convergence with applications to non-periodic homogenizationBraides, AndreaDal Maso, GianniLe Bris, Claudehttps://openscience.sissa.it/handle/1963/354712024-03-05T00:20:54Z2024-02-29T00:00:00Zdc.title: A closure theorem for gAMMA-convergence and H-convergence with applications to non-periodic homogenization
dc.contributor.author: Braides, Andrea; Dal Maso, Gianni; Le Bris, Claude
dc.description.abstract: In this work we examine the stability of some classes of integrals, and in particular
with respect to homogenization. The prototypical case is the homogenization of
quadratic energies with periodic coe cients perturbed by a term vanishing at in nity,
which has been recently examined in the framework of elliptic PDE.We use localization
techniques and higher-integrability Meyers-type results to provide a closure theorem by
gamma-convergence within a large class of integral functionals. From such result we derive
stability theorems in homogenization which comprise the case of perturbations with
zero average on the whole space. The results are also extended to the stochastic case,
and specialized to the G-convergence of operators corresponding to quadratic forms. A
corresponding analysis is also carried on for non-symmetric operators using the localization
properties of H-convergence. Finally, we treat the case of perforated domains
with Neumann boundary condition, and their stability.
dc.description: SISSA 3/2024/MATE
2024-02-29T00:00:00ZEXISTENCE AND BLOW-UP FOR NON-AUTONOMOUS SCALAR CONSERVATION LAWS WITH VISCOSITYBianchini, StefanoLeccese, Giacomo Mariahttps://openscience.sissa.it/handle/1963/354702024-02-16T00:20:35Z2023-11-23T00:00:00Zdc.title: EXISTENCE AND BLOW-UP FOR NON-AUTONOMOUS SCALAR CONSERVATION LAWS WITH VISCOSITY
dc.contributor.author: Bianchini, Stefano; Leccese, Giacomo Maria
dc.description.abstract: We consider a question posed in [1], namely the blow-up of the PDE
ut + (b(t, x)u1+k)x = uxx
when b is uniformly bounded, Lipschitz and k = 2. We give a complete answer to the behavior of
solutions when b belongs to the Lorentz spaces b ∈ Lp,∞, p ∈ (2,∞], or bx ∈ Lp,∞, p ∈ (1,∞].
dc.description: SISSA 15/2023/MATE
2023-11-23T00:00:00ZMarie Slodowska Curie Actions Postdoctoral Fellowship (PF)de Luca, Mariaritahttps://openscience.sissa.it/handle/1963/354662023-08-31T23:20:47Z2023-08-31T00:00:00Zdc.title: Marie Slodowska Curie Actions Postdoctoral Fellowship (PF)
dc.contributor.author: de Luca, Mariarita
2023-08-31T00:00:00ZHomogenisation problems for free discontinuity functionals with bounded cohesive surface termsDal Maso, GianniToader, Rodicahttps://openscience.sissa.it/handle/1963/354622023-07-11T23:20:44Z2023-07-11T00:00:00Zdc.title: Homogenisation problems for free discontinuity functionals with bounded cohesive surface terms
dc.contributor.author: Dal Maso, Gianni; Toader, Rodica
dc.description.abstract: We study stochastic homogenisation problems for free discontinuity func-
tionals under a new assumption on the surface terms, motivated by cohesive fracture
models. The results are obtained using a characterization of the limit functional by
means of the asymptotic behaviour of suitable minimum problems on cubes with very
simple boundary conditions. An important role is played by the subadditive ergodic
theorem.
2023-07-11T00:00:00ZDiscrete approximation of nonlocal-gradient energiesBraides, AndreaCausin, AndreaSolci, Margheritahttps://openscience.sissa.it/handle/1963/354612023-06-22T23:20:46Z2023-01-22T00:00:00Zdc.title: Discrete approximation of nonlocal-gradient energies
dc.contributor.author: Braides, Andrea; Causin, Andrea; Solci, Margherita
dc.description.abstract: We study a discrete approximation of functionals depending on nonlocal gradients.
The discretized functionals are proved to be coercive in classical Sobolev spaces. The
key ingredient in the proof is a formulation in terms of circulant Toeplitz matrices.
dc.description: SISSA 09/2023/MATE
2023-01-22T00:00:00ZAnother look at elliptic homogenizationBraides, AndreaCosma Brusca, GiuseppeDonati, Davidehttps://openscience.sissa.it/handle/1963/354602023-06-21T23:20:43Z2023-06-21T00:00:00Zdc.title: Another look at elliptic homogenization
dc.contributor.author: Braides, Andrea; Cosma Brusca, Giuseppe; Donati, Davide
dc.description.abstract: We consider the limit of sequences of normalized (s, 2)-Gagliardo seminorms
with an oscillating coefficient as s → 1. In a seminal paper by Bourgain, Brezis and
Mironescu (subsequently extended by Ponce) it is proven that if the coefficient is constant
then this sequence Γ-converges to a multiple of the Dirichlet integral. Here we prove that,
if we denote by ε the scale of the oscillations and we assume that 1−s << ε2, this sequence converges to the homogenized functional formally obtained by separating the effects of s and ε; that is, by the homogenization as ε → 0 of the Dirichlet integral with oscillating coefficient obtained by formally letting s → 1 first.
2023-06-21T00:00:00ZValidity and failure of the integral representation of Γ-limits of convex non-local functionalsBraides, AndreaDal Maso, Giannihttps://openscience.sissa.it/handle/1963/354592023-05-10T23:20:43Z2023-05-09T00:00:00Zdc.title: Validity and failure of the integral representation of Γ-limits of convex non-local functionals
dc.contributor.author: Braides, Andrea; Dal Maso, Gianni
dc.description.abstract: We prove an integral-representation result for limits of non-local quadratic forms on H1
0 pΩq, with Ω a bounded open subset of Rd, extending the representation on C8c
pΩq given by the Beurling-Deny formula in the theory of Dirichlet forms. We give
a counterexample showing that a corresponding representation may not hold if we
consider analogous functionals in W1,p0 pΩq, with p ‰ 2 and 1 ă p ď d.
dc.description: Preprint number SISSA/06/2023
2023-05-09T00:00:00ZΓ-CONVERGENCE AND INTEGRAL REPRESENTATION FOR A CLASS OF FREE DISCONTINUITY FUNCTIONALSDal Maso, GianniToader, Rodicahttps://openscience.sissa.it/handle/1963/354582023-05-19T06:51:41Z2023-05-05T00:00:00Zdc.title: Γ-CONVERGENCE AND INTEGRAL REPRESENTATION FOR A CLASS OF FREE DISCONTINUITY FUNCTIONALS
dc.contributor.author: Dal Maso, Gianni; Toader, Rodica
dc.description.abstract: We study the Γ -limits of sequences of free discontinuity functionals with
linear growth, assuming that the surface energy density is bounded. We determine the
relevant properties of the Γ -limit, which lead to an integral representation result by
means of integrands obtained by solving some auxiliary minimum problems on small
cubes.
dc.description: Preprint number:
SISSA 05/2023/MATE
2023-05-05T00:00:00ZParker Bound and Monopole Pair Production from Primordial Magnetic FieldsKobayashi, TakeshiPerri, Danielehttps://openscience.sissa.it/handle/1963/354572023-04-11T23:20:47Z2023-04-11T00:00:00Zdc.title: Parker Bound and Monopole Pair Production from Primordial Magnetic Fields
dc.contributor.author: Kobayashi, Takeshi; Perri, Daniele
dc.description.abstract: We present new bounds on the cosmic abundance of magnetic monopoles based
on the survival of primordial magnetic fields during the reheating and radiation-dominated
epochs. The new bounds can be stronger than the conventional Parker bound from galactic magnetic fields, as well as bounds from direct searches. We also apply our bounds to monopoles produced by the primordial magnetic fields themselves through the Schwinger effect, and derive additional conditions for the survival of the primordial fields.
dc.description: SISSA 4/2023/FISI
2023-04-11T00:00:00Z