3,002 research outputs found
Gravitational Geometric Phase in the Presence of Torsion
We investigate the relativistic and non-relativistic quantum dynamics of a
neutral spin-1/2 particle submitted an external electromagnetic field in the
presence of a cosmic dislocation. We analyze the explicit contribution of the
torsion in the geometric phase acquired in the dynamic of this neutral
spinorial particle. We discuss the influence of the torsion in the relativistic
geometric phase. Using the Foldy-Wouthuysen approximation, the non-relativistic
quantum dynamics are studied and the influence of the torsion in the
Aharonov-Casher and He-McKellar-Wilkens effects are discussed.Comment: 14 pages, no figur
The Godel metric in the Chern-Simons modified gravity
We discuss the consistency of the Godel metric within the Chern-Simons
modified gravity, both for external and dynamical Chern-Simons coefficients.Comment: 6 pages; to be published in the Proceedings of 5th International
Workshop on Astronomy and Relativistic Astrophysics (IWARA 2011), matches the
accepted versio
Relativistic Bose-Einstein condensate in the rainbow gravity
In this paper, we study the effects of a modified theory of gravity - the
rainbow gravity - on the relativistic Bose-Einstein condensate (BEC). We
initially discuss some formal aspects of the model in order to compute the
corrections to the relevant quantities of the condensate. Following, we
evaluate the generating functional from which obtain some thermodynamic
parameters. Then we calculate the corrected critical temperature that
sets the relativistic Bose-Einstein condensate considering the three principal
rainbow functions, finding, in addition, a phenomenological upper bound for the
parameters involved in the model. Finally, we discuss how harder is for the
particles at an arbitrary temperature to enter the condensed state
compared to the usual scenario, {\it i.e.}, without rainbow gravity.Comment: 13 pages, 2 figure, matches version accepted in EP
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