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40 papers · 1 filter
Single- and double-beta decay Fermi-transitions in an exactly solvable model
Jorge G. Hirsch, Peter O. Hess, Osvaldo Civitarese
An exactly solvable model suitable for the description of single and double-beta decay processes of the Fermi-type is introduced. The model is equivalent to the exact shell-model t…
Wormholes in spacetime with torsion
Luis A. Anchordoqui
Analytical wormhole solutions in theory are presented. It is discussed whether the extremely short range repulsive forces, related to the spin angular momentum of matter, cou…
Double beta decay and the proton-neutron residual interaction
Jorge G. Hirsch, Peter O. Hess, Osvaldo Civitarese
The validity of the pn-QRPA and -RQRPA descriptions of double beta decay transition amplitudes is analyzed by using an exactly solvable model. It is shown that the collapse of the…
The EXOSAT data on GX 339-4: further evidence for an ``intermediate'' state
Mariano Mendez, Michiel van der Klis
We have studied the fast timing and spectral behavior of the black hole candidate (BHC) GX 339-4 using all 1 - 20 keV EXOSAT ME data: the July 1983, March 1984, May 1984 and April…
Density dependence of the MIT bag parameters from the field theory of hadrons
R. Aguirre, M. Schvellinger
A self-consistent description of the MIT bag parameters as functions of the nuclear matter density is presented. The subnuclear degrees of freedom are treated in the Quark-Meson Co…
Semi-local Cosmic Strings and the Cosmological Constant Problem
Jose Daniel Edelstein
We study the cosmological constant problem in a three-dimensional N=2 supergravity theory with gauge group SU[2]_{global}xU[1]_{local}. The model we consider is known to admit stri…