522 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Instituto Superior TécnicoPT53 papers
- University of LisbonPT24 papers
- Centro de MatemáticaPT10 papers
- Universidade Técnica de LisboaPT9 papers
- University of MinhoPT9 papers
- Iscte – Instituto Universitário de LisboaPT4 papers
- Universidade do PortoPT4 papers
- Universidade Federal do Rio de JaneiroBR3 papers
- University of TurinIT3 papers
- Centre National de la Recherche ScientifiqueFR2 papers
- Heriot-Watt UniversityGB2 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di TorinoIT2 papers
57 papers
The isospectrality of asymptotic quasinormal modes of large Gauss-Bonnet d-dimensional black holes
Filipe Moura, João Rodrigues
We compute the quasinormal frequencies of d-dimensional large spherically symmetric black holes with Gauss-Bonnet corrections in the highly damped regime. We solve perturbatively t…
Primordial magnetic fields in theories of gravity with non-minimal coupling between curvature and matter
Orfeu Bertolami, Maria Margarida Lima, Filipe C. Mena
The existence of magnetic fields in the universe is unmistakable. They are observed at all scales from stars to galaxy clusters. However, the origin of these fields remains enigmat…
Quasinormal modes and stability of boosted Reissner-Nordström AdS black holes
Rodrigo D. B. Fontana, Filipe C. Mena
We investigate the numerical stability of accelerated AdS black holes against linear scalar perturbations. In particular, we study the evolution of a probe non-minimally coupled sc…
Higher Vector Bundles
Matias del Hoyo, Giorgio Trentinaglia
We introduce higher analogs for cleavages in the context of (Kan) simplicial fibrations. We apply them to obtain geometric models for representations up to homotopy of (higher) Lie…
An abstract theory of physical measurements
Pedro Resende
The question of what should be meant by a measurement is tackled from a mathematical perspective whose physical interpretation is that a measurement is a fundamental process via wh…
Stability of the Cauchy horizon in accelerating black-hole spacetimes
Kyriakos Destounis, Rodrigo D. B. Fontana, Filipe C. Mena
The extendibility of spacetime and the existence of weak solutions to the Einstein field equations beyond Cauchy horizons, is a crucial ingredient to examine the limits of General…
On the geometry of physical measurements: topological and algebraic aspects
Pedro Resende
We study the mathematical structure of the notion of measurement space, which extends aspects of noncommutative topology that are based on quantale theory. This yields a geometric…
Actions of étale-covered groupoids
Juan Pablo Quijano, Pedro Resende
By restricting to a class of localic open groupoids which, similarly to Lie groupoids, possess appropriate covers by étale groupoids, we extend results about…
Global dynamics of Yang-Mills field and perfect-fluid Robertson-Walker cosmologies
Artur Alho, Vitor Bessa, Filipe C. Mena
We apply a new global dynamical systems formulation to flat Robertson-Walker cosmologies with a massless and massive Yang-Mills field and a perfect-fluid with linear equation of st…
Singularity theorems and the inclusion of torsion in affine theories of gravity
Paulo Luz, Filipe C. Mena
We extend the scope of the Raychaudhuri-Komar singularity theorem of General Relativity to affine theories of gravity with and without torsion. We first generalize the existing foc…
Uniqueness among scalar-flat Kähler metrics on non-compact toric -manifolds
Rosa Sena-Dias
Abreu-Sena-Dias have constructed two distinct families of scalar-flat Kähler non-compact toric metrics using Donaldson's rephrasing of Joyce's construction in action-angle coordina…
Strong Cosmic Censorship in Horndeski Theory
Kyriakos Destounis, Rodrigo D. B. Fontana, Filipe C. Mena +1
The strong cosmic censorship hypothesis has recently regained a lot of attention in charged and rotating black holes immersed in de Sitter space. Although the picture seems to be c…
Effective equivalence relations and principal quantales
Juan Pablo Quijano, Pedro Resende
Stably supported quantales generalize pseudogroups and provide an algebraic context in which to study the correspondences between inverse semigroups and étale groupoids. Here we st…
Functoriality of groupoid quantales. II
Juan Pablo Quijano, Pedro Resende
Taking advantage of the quantale-theoretic description of étale groupoids we study principal bundles, Hilsum-Skandalis maps, and Morita equivalence in terms of modules on inverse q…
Point island dynamics under fixed rate deposition
D. Allen, M. Grinfeld, R. Sasportes
In this paper we consider the dynamics of point islands during submonolayer deposition, in which the fragmentation of subcritical size islands is allowed. To understand asymptotics…
Unramified covers and branes on the Hitchin system
Emilio Franco, Peter Gothen, André Oliveira +1
We study the locus of the moduli space of Higgs bundles on a curve given by those Higgs bundles obtained by pushforward under an unramified cover. We equip these loci with a hyperh…
Branes on the singular locus of the Hitchin system via Borel and other parabolic subgroups
Emilio Franco, Ana Peón-Nieto
We study mirror symmetry on the singular locus of the Hitchin system at two levels. Firstly, by covering it by (supports of) -branes, corresponding to Higgs bundles reducing…
Mirror symmetry for Nahm branes
Emilio Franco, Marcos Jardim
The Dirac--Higgs bundle is a hyperholomorphic bundle over the moduli space of stable Higgs bundles of coprime rank and degree. We provide an algebraic generalization to the case of…
Open maps of involutive quantales
Pedro Resende
By a map of involutive quantales is meant a homomorphism . Calling a map weakly open if has a left adjoint which satisfies the Frobenius reci…
Variational problems with long-range interaction
Nicola Soave, Hugo Tavares, Susanna Terracini +1
We consider a class of variational problems for densities that repel each other at distance. Typical examples are given by the Dirichlet functional and the Rayleigh functional \[ D…
Quantales and Fell bundles
Pedro Resende
We study Fell bundles on groupoids from the viewpoint of quantale theory. Given any saturated upper semicontinuous Fell bundle on an étale groupoid with locall…
Twin Supergravities from Yang-Mills Squared
A. Anastasiou, L. Borsten, M. J. Duff +4
We consider `twin supergravities' - pairs of supergravities with and supersymmetries, , with identical bosonic sectors…
Recovering -invariant toric Kähler metrics on from the torus equivariant spectrum
Tomás A. Reis, Rosa Sena-Dias
In this note we prove that toric Kähler metrics on complex projective space which are also -invariant are determined by their equivariant spectrum i.e. the list of eigenvalue…
A JKO splitting scheme for Kantorovich-Fisher-Rao gradient flows
Thomas Gallouët, Léonard Monsaingeon
In this article we set up a splitting variant of the JKO scheme in order to handle gradient flows with respect to the Kantorovich-Fisher-Rao metric, recently introduced and defined…