2.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Instituto Superior TécnicoPT388 papers
- Centro de Física Teórica de Partículas54 papers
- University of ViennaAT37 papers
- Centre National de la Recherche ScientifiqueFR34 papers
- University of LisbonPT34 papers
- University of MississippiUS31 papers
- Universitat de ValènciaES27 papers
- California Institute of TechnologyUS25 papers
- University of CoimbraPT19 papers
- European Organization for Nuclear ResearchCH18 papers
- Instituto de TelecomunicaçõesPT18 papers
- Instituto Politécnico de LisboaPT17 papers
21 papers · 1 filter
Comment on 'A close examination of the motion of an adiabatic piston' by Eric A. Gislason [Am. J. Phys. 78, 995-1001 (2010)]
Rodrigo de Abreu, Vasco Guerra
A recent paper by Gislason published in Am. J. Phys. deals with the celebrated example of the so-called "adiabatic piston", a system involving two ideal gases contained in a horizo…
AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks
J. L. Albacete, N. Armesto, J. G. Milhano +2
We present a global analysis of available data on inclusive structure functions and reduced cross sections measured in electron-proton scattering at small values of Bjorken-x, x<0.…
Magnetic impurity in a -Spin Liquid with a Spinon Fermi-Surface
P. Ribeiro, P. A. Lee
We address the problem of a magnetic impurity in a two dimensional spin liquid where the spinons have gap-less excitations near the Fermi-surface and are coupled to an emerg…
Superstring-Inspired E_6 Unification, Shadow Theta-Particles and Cosmology
C. R. Das, L. V. Laperashvili, A. Tureanu
We construct a new cosmological model considering the superstring-inspired E_6 unification in the 4-dimensional space at the early stage of the Universe. We develop a concept of pa…
Sensor Selection for Event Detection in Wireless Sensor Networks
Dragana Bajovic, Bruno Sinopoli, Joao Xavier
We consider the problem of sensor selection for event detection in wireless sensor networks (WSNs). We want to choose a subset of p out of n sensors that yields the best detection…
Robust Simultaneous Localization of Nodes and Targets in Sensor Networks Using Range-Only Measurements
Pınar Oğuz-Ekim, João Gomes, João Xavier +1
Simultaneous localization and tracking (SLAT) in sensor networks aims to determine the positions of sensor nodes and a moving target in a network, given incomplete and inaccurate r…
The minimum distance of parameterized codes on projective tori
Eliseo Sarmiento, Maria Vaz Pinto, Rafael H. Villarreal
Let X be a subset of a projective space, over a finite field K, which is parameterized by the monomials arising from the edges of a clutter. Let I(X) be the vanishing ideal of X. I…
Distributed Basis Pursuit
João F. C. Mota, João M. F. Xavier, Pedro M. Q. Aguiar +1
We propose a distributed algorithm for solving the optimization problem Basis Pursuit (BP). BP finds the least L1-norm solution of the underdetermined linear system Ax = b and is u…
Delicate interplay between the D0-D*0, rho0-J/psi, and omega-J/psi channels in the X(3872) resonance
Susana Coito, George Rupp, Eef van Beveren
The nature of the X(3872) enhancement is analysed in the framework of the Resonance-Spectrum Expansion, by studying it as a regular charmonium state, though strongl…
Implementing quantum gates through scattering between a static and a flying qubit
G. Cordourier-Maruri, F. Ciccarello, Y. Omar +3
We investigate whether a two-qubit quantum gate can be implemented in a scattering process involving a flying and a static qubit. To this end, we focus on a paradigmatic setup made…
Impurity states in graphene with intrinsic spin-orbit interaction
M Inglot, V K Dugaev
We consider the problem of electron energy states related to strongly localized potential of a single impurity in graphene. Our model simulates the effect of impurity atom substitu…
Cooperative Convex Optimization in Networked Systems: Augmented Lagrangian Algorithms with Directed Gossip Communication
Dusan Jakovetic, Joao Xavier, Jose M. F. Moura
We study distributed optimization in networked systems, where nodes cooperate to find the optimal quantity of common interest, x=x^\star. The objective function of the correspondin…
Constraining Dark Matter Properties with Gamma-Rays from the Galactic Center with Fermi-LAT
Nicolas Bernal, Sergio Palomares-Ruiz
We study the capabilities of the Fermi-LAT instrument on board of the Fermi mission to constrain particle dark matter properties, as annihilation cross section, mass and branching…
Complex masses in the S-matrix
George Rupp, Susana Coito, Eef van Beveren
Most excited hadrons have multiparticle strong decay modes, which can often be described as resulting from intermediate states containing one or two resonances. In a theoretical ap…
Localization in fractal and multifractal media
Antonio M. Garcia-Garcia, Emilio Cuevas
The propagation of waves in highly inhomogeneous media is a problem of interest in multiple fields including seismology, acoustics and electromagnetism. It is also relevant for tec…
A new proof of the Herman-Avila-Bochi formula for Lyapunov exponents of SL(2,R)-cocycles
Alexandre T. Baraviera, Joao Lopes Dias, Pedro Duarte
We study the geometry of the action of SL(2,R) on the projective line in order to present a new and simpler proof of the Herman-Avila-Bochi formula. This formula gives the average…
Density of states and quantum phase transition in the thermodynamic limit of the Mermin central-spin model
Savannah Sterling Garmon, Pedro Ribeiro, Rémy Mosseri
We apply a spin-coherent states formalism to study the central-spin model with monochromatic bath and symmetric coupling (the Mermin model); in particular, we derive analytic expre…
Quasiblack holes with pressure: General exact results
José P. S. Lemos, Oleg B. Zaslavskii
A quasiblack hole is an object in which its boundary is situated at a surface called the quasihorizon, defined by its own gravitational radius. We elucidate under which conditions…
Quasiblack holes with pressure: relativistic charged spheres as the frozen stars
José P. S. Lemos, Vilson T. Zanchin
In general relativity coupled to Maxwell's electromagnetism and charged matter, when the gravitational potential and the electric potential field obey a relation of the f…
U(1) slave-particle study of the finite-temperature doped Hubbard model in one and two dimensions
P. Ribeiro, P. D. Sacramento, M. A. N. Araujo
One-dimensional systems have unusual properties such as fractionalization of degrees of freedom. Possible extensions to higher dimensional systems have been considered in the liter…
Minimum Number of Fox Colors for Small Primes
P. Lopes, J. Matias
This article concerns exact results on the minimum number of colors of a Fox coloring over the integers modulo r, of a link with non-null determinant. Specifically, we prove that w…