Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Dutra, Alvaro de Souza"'
We study the cosmological evolution with nonsingular branes generated by a bulk scalar field coupled to gravity. The specific setup investigated leads to branes with a time-dependent warp factor. We calculate the effective Hubble parameter and the ef
Externí odkaz:
http://arxiv.org/abs/1603.04797
Autor:
Dutra, Alvaro de Souza, Hott, M. B.
In this work we solve the Dirac equation by constructing the exact bound state solutions for a mixing of vector and scalar generalized Hartmann potentials. This is done provided the vector potential is equal to or minus the scalar potential. The case
Externí odkaz:
http://arxiv.org/abs/0705.3447
Publikováno v:
Phys.Rev.D72:087701,2005
Some years ago, Cho and Vilenkin, introduced a model which presents topological solutions, despite not having degenerate vacua as is usually expected. Here we present a new model with topological defects, connecting degenerate vacua but which in a ce
Externí odkaz:
http://arxiv.org/abs/0705.3393
Autor:
Dutra, Alvaro de Souza
Publikováno v:
Journal of Physics A: Math. Gen., vol. 39, pages 203-208 (2006)
In this work we show that the ordering ambiguity on quantization depends on the representation choice. This property is then used to solve unambiguously some particular systems. Finally, we speculate on the consequences for more involved cases.
Externí odkaz:
http://arxiv.org/abs/0705.3247
Autor:
Dutra, Alvaro de Souza
In this work, we present a general procedure, which is able to generate new exact solitonic models in 1+1 dimensions, from a known one, consisting of two coupled scalar fields. An interesting consequence of the method, is that of the appearing of non
Externí odkaz:
http://arxiv.org/abs/0705.3237
Autor:
Dutra, Alvaro de Souza
Publikováno v:
Phys.Lett.B626:249-255,2005
In this work we present some classes of models whose the corresponding two coupled first-order nonlinear equations can be put into a linear form, and consequently be solved completely. In these cases the so-called trial orbit method is completely unn
Externí odkaz:
http://arxiv.org/abs/0705.2903
Publikováno v:
Phys.Rev. D67 (2003) 047701
We study a new mechanism for the electromagnetic gauging of chiral bosons showing that new possibilities emerge for the interacting theory of chiral scalars. We introduce a chirally coupled gauge field necessary to mod out the degree of freedom that
Externí odkaz:
http://arxiv.org/abs/hep-th/0211161
Publikováno v:
Phys.Rev. D66 (2002) 105008
We have devoted an effort to study some nonlinear actions, characteristics of the ${\cal W}$-theories, in the framework of the soldering formalism. We have disclosed interesting new results concerning the embedding of the original chiral ${\cal W}$-p
Externí odkaz:
http://arxiv.org/abs/hep-th/0203234
Publikováno v:
Phys.Rev. D64 (2001) 065003
In this work we prove in a precise way that the soldering formalism can be applied to the Srivastava chiral boson (SCB), in contradiction with some results appearing in the literature. We have promoted a canonical transformation that shows directly t
Externí odkaz:
http://arxiv.org/abs/hep-th/0103175
Publikováno v:
Phys.Rev. D64 (2001) 025023
We have studied the theory of gauged chiral bosons and proposed a general theory, a master action, that encompasses different kinds of gauge field couplings in chiral bosonized theories with first-class chiral constraints. We have fused opposite chir
Externí odkaz:
http://arxiv.org/abs/hep-th/0009157