3 papers
gr-qc2006
Gravitational Effects of Varying Alpha Strings
J. Menezes, P. P. Avelino, C. Santos
We study spatial variations of the fine-structure constant in the presence of static straight cosmic strings in the weak-field approximation in Einstein gravity. We work in the con…
astro-ph2005
Evolution of the fine-structure constant in the non-linear regime
P. P. Avelino, C. J. A. P. Martins, J. Menezes +1
We study the evolution of the fine-structure constant, , induced by non-linear density perturbations in the context of the simplest class of quintessence models with a non-minim…
astro-ph2004
Cosmic strings in Bekenstein-type models
J. Menezes, P. P. Avelino, C. Santos
We study static cosmic string solutions in the context of Bekenstein-type models. We show that there is a class of models of this type for which the classical Nielsen-Olesen vortex…