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172 papers · 1 filter
On the instability of Reissner-Nordstrom black holes in de Sitter backgrounds
Vitor Cardoso, Madalena Lemos, Miguel Marques
Recent numerical investigations have uncovered a surprising result: Reissner-Nordstrom-de Sitter black holes are unstable for spacetime dimensions larger than 6. Here we prove the…
Collective oscillations in ultracold atomic gases
J. T. Mendonça, R. Kaiser, H. Terças +1
Using both fluid and kinetic descriptions, where repulsive forces between near by atoms are included, we discuss the basic oscillations and waves of a cloud of ultra-cold atoms con…
Inert-Sterile Neutrino: Cold or Warm Dark Matter Candidate
Graciela B. Gelmini, Efunwande Osoba, Sergio Palomares-Ruiz
In usual particle models, sterile neutrinos can account for the dark matter of the Universe only if they have masses in the keV range and are warm dark matter. Stringent cosmologic…
The singularity problem and phase-space noncanonical noncommutativity
Catarina Bastos, Orfeu Bertolami, Nuno Costa Dias +1
The Wheeler-DeWitt equation arising from a Kantowski-Sachs model is considered for a Schwarzschild black hole under the assumption that the scale factors and the associated momenta…
Crystal melting on toric surfaces
Michele Cirafici, Amir-Kian Kashani-Poor, Richard J. Szabo
We study the relationship between the statistical mechanics of crystal melting and instanton counting in N=4 supersymmetric U(1) gauge theory on toric surfaces. We argue that, in c…
An Augmented Lagrangian Approach to the Constrained Optimization Formulation of Imaging Inverse Problems
Manya V. Afonso, José M. Bioucas-Dias, Mário A. T. Figueiredo
We propose a new fast algorithm for solving one of the standard approaches to ill-posed linear inverse problems (IPLIP), where a (possibly non-smooth) regularizer is minimized unde…