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
33 papers · 1 filter
Schwinger-Dyson equations and the quark-antiquark static potential
P. Bicudo, G. Marques, M. Cardoso +2
In lattice QCD, a confining potential for a static quark-antiquark pair can be computed with the Wilson loop technique. This potential, dominated by a linear potential at moderate…
TeV-scale seesaw mechanism catalyzed by the electron mass
W. Grimus, L. Lavoura
We construct a model in which the neutrino Dirac mass terms are of order the electron mass and the seesaw mechanism proceeds via right-handed neutrinos with masses of order TeV. In…
Stability of the superfluid state in a disordered 1D ultracold fermionic gas
Masaki Tezuka, Antonio M. Garcia-Garcia
We study a 1D Fermi gas with attractive short range-interactions in a disordered potential by the density matrix renormalization group (DMRG) technique. This setting can be impleme…
Limits to measurement in experiments governed by algorithms
E. J. Beggs, J. F. Costa, J. V. Tucker
We pose the following question: If a physical experiment were to be completely controlled by an algorithm, what effect would the algorithm have on the physical measurements made po…
A holographic approach to phase transitions
Sebastian Franco, Antonio M. Garcia-Garcia, Diego Rodriguez-Gomez
We provide a description of phase transitions at finite temperature in strongly coupled field theories using holography. For this purpose, we introduce a general class of gravity d…
Trimaximal lepton mixing with a trivial Dirac phase
W. Grimus, L. Lavoura, A. Singraber
We present a model which employs the seesaw mechanism with five right-handed neutrinos, leading to trimaximal and CP-conserving lepton mixing. Tri-bimaximal mixing is a natural lim…
Stability of submanifolds with parallel mean curvature in calibrated manifolds
Isabel M. C. Salavessa
On a Riemannian manifold with an -calibration , we prove that an -submanifold with constant mean curvature and calibrated extended tangent spac…
Characterizations of one-way general quantum finite automata
Lvzhou Li, Daowen Qiu, Xiangfu Zou +3
In this paper we study a generalized model named one-way general quantum finite automata} (1gQFA), in which each symbol in the input alphabet induces a trace-preserving quantum ope…
BCS superconductivity in metallic nanograins: Finite-size corrections, low energy excitations, and robustness of shell effects
Antonio M. Garcia-Garcia, Juan Diego Urbina, Emil A. Yuzbashyan +2
We combine the BCS self-consistency condition, a semiclassical expansion for the spectral density and interaction matrix elements to describe analytically how the superconducting g…
Spin Hall effect in a system of Dirac fermions in the honeycomb lattice with intrinsic and Rashba spin-orbit interaction
A. Dyrdal, V. K. Dugaev, J. Barnas
We consider spin Hall effect in a system of massless Dirac fermions in a graphene lattice. Two types of spin-orbit interaction, pertinent to the graphene lattice, are taken into ac…
Single vortex structure in two models of iron pnictide superconductivity
M. A. N. Araujo, M. Cardoso, P. D. Sacramento
The structure of a single vortex in a FeAs superconductor is studied in the framework of two formulations of superconductivity for the recently proposed sign-reversed wave ($s^…
Astrophysical Implications of the Superstring-Inspired E_6 Unification and Shadow Theta-Particles
C. R. Das, L. V. Laperashvili, A. Tureanu
We have developed a concept of parallel existence of the ordinary (O) and mirror (M), or shadow (Sh) worlds. E_6 unification, inspired by superstring theory, restores the broken mi…
Remaining inconsistencies with solar neutrinos: can spin flavour precession provide a clue?
Joao Pulido, C R Das, Marco Picariello
A few inconsistencies remain after it has been ascertained that LMA is the dominant solution to the solar neutrino problem: why is the SuperKamiokande spectrum flat and why is the…
Chromoelectric and chromomagnetic fields for the static gluon-quark-antiquark system
Marco Cardoso, Nuno Cardoso, Pedro Bicudo
The chromoelectric and chromomagnetic fields, created by a static gluon-quark-antiquark system, are computed in the quenched approximation of lattice QCD, in a latt…
Induced magnetic moment in graphene with a nonmagnetic impurity
M Inglot, V K Dugaev
We consider a two-dimensional crystalline monolayer of carbon atoms with a single non-magnetic impurity. Using the Weyl Hamiltonian to describe electronic energy spectrum near the…
A Fast Algorithm for the Constrained Formulation of Compressive Image Reconstruction and Other Linear Inverse Problems
Manya V. Afonso, Jose M. Bioucas-Dias, Mario A. T. Figueiredo
Ill-posed linear inverse problems (ILIP), such as restoration and reconstruction, are a core topic of signal/image processing. A standard approach to deal with ILIP uses a constrai…
Extensive optical and near-infrared observations of the nearby, narrow-lined type Ic SN 2007gr: days 5 to 415
Deborah J. Hunter, Stefano Valenti, Rubina Kotak +26
We present photometric and spectroscopic observations at optical and near-infrared wavelengths of the nearby type Ic SN 2007gr. These represent the most extensive data-set to date…
Multichannel calculation of excited vector resonances and the
Susana Coito, George Rupp, Eef van Beveren
A multichannel calculation of excited states is carried out within a generalization of the Resonance-Spectrum Expansion, which may shed light on the classificat…
Production of hadron pairs in electron-positron annihilation near the K(+)K(-), D-Dbar, B-Bbar and Lambda(c)(+)-Lambda(c)(-) thresholds
Eef van Beveren, George Rupp
We study the structures in cross sections and R ratios concerning electron-positron annihilation reactions, for open-strangeness, open-charm and open-beauty hadron-pair production,…
Characterization of the Millimeter-Wave Polarization of Centaurus A with QUaD
M. Zemcov, P. Ade, J. Bock +28
Centaurus (Cen) A represents one of the best candidates for an isolated, compact, highly polarized source that is bright at typical cosmic microwave background (CMB) experiment fre…
The fundamental Gray 3-groupoid of a smooth manifold and local 3-dimensional holonomy based on a 2-crossed module
Joao Faria Martins, Roger Picken
We define the thin fundamental Gray 3-groupoid of a smooth manifold and define (by using differential geometric data) 3-dimensional holonomies, to be smooth strict Gra…
Real-time approach to quark confined systems at finite temperatures
A. V. Nefediev, J. E. F. T. Ribeiro
Generalised Nambu-Jona-Lasinio model for QCD is considered at finite temperatures in the framework of a real-time formalism. The proposed approach allows one to study various prope…
A general class of holographic superconductors
Sebastian Franco, Antonio Garcia-Garcia, Diego Rodriguez-Gomez
We introduce a simple generalization of the basic holographic superconductor model in which the spontaneous breaking of a global U(1) symmetry occurs via the Stueckelberg mechanism…
Quanta of Local Conformational Change: Conformons in alpha-helical proteins
Victor Atanasov, Yasser Omar
We propose the conformon as a quantum of conformational change for energy transfer in alpha-helical proteins. The underlying mechanism of interaction between the quantum of excitat…