157 research outputs found
Holographic superconductor in a deformed four-dimensional STU model
In this paper, we consider deformed STU model in four dimensions including
both electric and magnetic charges. Using AdS/CFT correspondence, we study
holographic superconductor and obtain transport properties like electrical and
thermal conductivities. We obtain transport properties in terms of the black
hole magnetic charge and interpret it as magnetic monopole of dual field
theory. We find that presence of magnetic charge is necessary to have maximum
conductivities, and existence of magnetic monopole with a critical charge (137
e) to reach the maximum superconductivity is important. Also, we show that
thermal conductivity increases with increasing of magnetic charge. It may be
concluded that the origin of superconductivity is magnetic monopole.Comment: 19 pages, 8 Figures. Accepted for publication in EPJ
Deformation of the quintom cosmological model and its consequences
In this paper, we investigate the effects of non-commutative phase-space on
the quintom cosmological model. In that case, we discuss ,
and other cosmological parameters and show that they are
associated to deformation parameters and . Generally one can
say that, the non-commutative parameter plays important role in physics and
here also help us to arrange the divergency of cosmological constant. We draw
time-dependent scale factor and investigate the effect of non-commutative
parameters. Finally, we take advantage from non-commutative phase-space and
obtain the deformed Lagrangian for the quintom model. In order to discuss some
cosmological phenomena as dark energy and inflation, we employ Neother
symmetry.Comment: 17 pages, 1 figure. References added in the revised versio
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