6 papers
Cosmic string configuration in a five dimensional Brans-Dicke theory
V. B. Bezerra, C. N. Ferreira, G. de A. Marques
We consider a scalar field interaction with a cosmic string configuration in a flat 3-brane. The origin of this field is given by a compactification mechanism in the context of a 5…
Supermassive screwed cosmic string in dilaton gravity
Valdir B. Bezerra, Cristine N. Ferreira, Herman J. Mosquera Cuesta
The early Universe might have undergone phase transitions at energy scales much higher than the one corresponding to the Grand Unified Theories (GUT) scales. At these higher energy…
Lorentz-breaking effects in scalar-tensor theories of gravity
V. B. Bezerra, C. N. Ferreira, J. A. Helayel-Neto
In this work, we study the effects of breaking Lorentz symmetry in scalar-tensor theories of gravity taking torsion into account. We show that a space-time with torsion interacting…
Gravitational field around a time-like current-carrying screwed cosmic string in scalar-tensor theories
V. B. Bezerra, C. N. Ferreira, J. B. Fonseca-Neto +1
In this paper we obtain the space-time generated by a time-like current-carrying superconducting screwed cosmic string(TCSCS). This gravitational field is obtained in a modified sc…
Cosmic optical activity in the spacetime of a scalar-tensor screwed cosmic string
V. B. Bezerra, H. J. Mosquera Cuesta, C. N. Ferreira
Measurements of radio emission from distant galaxies and quasars verify that the polarization vectors of these radiations are not randomly oriented as naturally expected. This pecu…
Dilatonic, Current-Carrying Cosmic String
C. N. Ferreira, M. E. X. Guimaraes, J. A. Helayel-Neto
We study the implications of a scalar-tensorial gravity for the metric of an isolated self-gravitating superconducting cosmic string. These modifications are induced by an arbitrar…