306 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade do PortoPT174 papers
- University of CoimbraPT98 papers
- University of MinhoPT81 papers
- University of LisbonPT24 papers
- Centre National de la Recherche ScientifiqueFR22 papers
- Instituto Superior TécnicoPT22 papers
- UCLouvainBE13 papers
- Universidade Federal da BahiaBR13 papers
- Centro de Análise Matemática Geometria e Sistemas DinâmicosPT10 papers
- Pontifícia Universidade Católica do Rio de JaneiroBR10 papers
- Universidad de La LagunaES9 papers
- Universidade Federal do Rio de JaneiroBR9 papers
19 papers · 1 filter
Reduction and construction of Poisson quasi-Nijenhuis manifolds with background
Flavio Cordeiro, Joana M. Nunes da Costa
We extend the Falceto-Zambon version of Marsden-Ratiu Poisson reduction to Poisson quasi-Nijenhuis structures with background on manifolds. We define gauge transformations of Poiss…
String-corrected dilatonic black holes in d dimensions
Filipe Moura
We solve the dilaton field equation in the background of a spherically symmetric black hole in bosonic or heterotic string theory with curvature-squared corrections in arbitrary d…
Thermodynamic formalism for contracting Lorenz flows
Maria Jose Pacifico, Mike Todd
We study the expansion properties of the contracting Lorenz flow introduced by Rovella via thermodynamic formalism. Specifically, we prove the existence of an equilibrium state for…
Separating expansion from contraction: generalized TOV condition, LTB models with pressure and CDM
Morgan Le Delliou, Filipe C. Mena, José Pedro Mimoso
We discuss the existence of a dividing shell separating expanding and collapsing regions in spherically symmetric solutions with pressure. We obtain gauge invariant conditions rela…
Incompressible surfaces in handlebodies and boundary reducible 3-manifolds
João Miguel Nogueira, Henry Segerman
We study the existence of incompressible embeddings of surfaces into the genus two handlebody. We show that for every compact surface with boundary, orientable or not, there is an…
Finite Resolution Dynamics
Stefano Luzzatto, Pawel Pilarczyk
We develop a new mathematical model for describing a dynamical system at limited resolution (or finite scale), and we give precise meaning to the notion of a dynamical system havin…
Bilinear biorthogonal expansions and the Dunkl kernel on the real line
L. D. Abreu, Ó. Ciaurri, J. L. Varona
We study an extension of the classical Paley-Wiener space structure, which is based on bilinear expansions of integral kernels into biorthogonal sequences of functions. The structu…
Profinite Groups Associated to Sofic Shifts are Free
Alfredo Costa, Benjamin Steinberg
We show that the maximal subgroup of the free profinite semigroup associated by Almeida to an irreducible sofic shift is a free profinite group, generalizing an earlier result of t…
Density of first Poincaré returns, periodic orbits, and Kolmogorov-Sinai entropy
Paulo R. F. Pinto, M. S. Baptista, Isabel S. Labouriau
It is known that unstable periodic orbits of a given map give information about the natural measure of a chaotic attractor. In this work we show how these orbits can be used to cal…
Kolmogorov-Sinai entropy from recurrence times
M. S. Baptista, E. J. Ngamga, Paulo R. F. Pinto +2
Observing how long a dynamical system takes to return to some state is one of the most simple ways to model and quantify its dynamics from data series. This work proposes two formu…
A new semidefinite programming hierarchy for cycles in binary matroids and cuts in graphs
João Gouveia, Monique Laurent, Pablo A. Parrilo +1
The theta bodies of a polynomial ideal are a series of semidefinite programming relaxations of the convex hull of the real variety of the ideal. In this paper we construct the thet…
On Noncrossing and nonnesting partitions of type D
Alessandro Conflitti, Ricardo Mamede
We present an explicit bijection between noncrossing and nonnesting partitions of Coxeter systems of type D which preserves openers, closers and transients.
Linear time equivalence of Littlewood--Richardson coefficient symmetry maps
Olga Azenhas, Alessandro Conflitti, Ricardo Mamede
Benkart, Sottile, and Stroomer have completely characterized by Knuth and dual Knuth equivalence a bijective proof of the conjugation symmetry of the Littlewood-Richardson coeffici…
Statistical stability and continuity of SRB entropy for systems with Gibbs-Markov structures
Jose F. Alves, Maria Carvalho, Jorge Milhazes Freitas
We present conditions on families of diffeomorphisms that guarantee statistical stability and SRB entropy continuity. They rely on the existence of horseshoe-like sets with infinit…
Parallel Kustin--Miller unprojection with an application to Calabi--Yau geometry
Jorge Neves, Stavros Argyrios Papadakis
Kustin--Miller unprojection constructs more complicated Gorenstein rings from simpler ones. Geometrically, it inverts certain projections, and appears in the constructions of expli…
Equilibrium Fluctuations for the Totally Asymmetric Zero Range process
Patricia Goncalves
We prove a Central Limit Theorem for the empirical measure in the one-dimensional Totally Asymmetric Zero-Range Process in the hyperbolic scaling , starting from the equilibrium…
Weak sectional category
J. M. G. Calcines, L. Vandembroucq
Based on a Whitehead-type characterization of the sectional category we develop the notion of weak sectional category. This is a new lower bound of the sectional category, which is…
On KP-II type equations on cylinders
Axel Grünrock, Mahendra Panthee, Jorge Drumond Silva
In this article we study the generalized dispersion version of the Kadomtsev-Petviashvili II equation, on $\T \times \R$ and $\T \times \R^2$. We start by proving bilinear Strichar…
Sampling and interpolation in Bargmann-Fock spaces of polyanalytic functions
Luis Daniel Abreu
Using Gabor analysis, we give a complete characterization of all lattice sampling and interpolating sequences in the Fock space of polyanalytic functions, displaying a "Nyquist rat…