107 research outputs found
A robust relativistic quantum two-level system with edge-dependent currents and spin polarization
This work was supported by AFOSR under Grant No. FA9550-15-1-0151. LH was supported by NSFC under Grant No. 11422541.Peer reviewedPostprin
Superpersistent currents and whispering gallery modes in relativistic quantum chaotic systems
Acknowledgements This work was supported by AFOSR under Grant No. FA9550-12-1-0095 and by ONR under Grant No. N00014-08-1-0627. LH was supported by the NSF of China under Grant No. 11422541Peer reviewedPublisher PD
Radiation and Potential Barriers of a 5D Black String Solution
By using a massless scalar field we examine the effect of an extra dimension
on black hole radiation. Because the equations are coupled, we find that the
structure of the fifth dimension (as for membrane and induced-matter theory)
affects the nature of the radiation observed in four-dimensional spacetime. In
the case of the Schwarzschild-de Sitter solution embedded in a Randall-Sundrum
brane model, the extension of the black hole along the fifth dimension looks
like a black string. Then it is shown that, on the brane, the potential barrier
surrounding the black hole has a quantized as well as a continuous spectrum. In
principle, Hawking radiation may thus provide a probe for higher dimensions.Comment: 9 pages, 3 figures, accepted for publication on MPL
Scaling Dark Energy in a Five-Dimensional Bouncing Cosmological Model
We consider a 5-dimensional Ricci flat bouncing cosmological model in which
the 4-dimensional induced matter contains two components at late times - the
cold dark matter (CDM)+baryons and dark energy. We find that the arbitrary
function contained in the solution plays a similar role as the potential
in quintessence and phantom dark energy models. To resolve the
coincidence problem, it is generally believed that there is a scaling stage in
the evolution of the universe. We analyze the condition for this stage and show
that a hyperbolic form of the function can work well in this property.
We find that during the scaling stage (before ), the dark energy
behaves like (but not identical to) a cold dark matter with an adiabatic sound
speed and . After , the
pressure of dark energy becomes negative. The transition from deceleration to
acceleration happens at which, as well as other predictions
of the model, agree with current observations.Comment: 13 pages, 1 table, 3 figures, published version, references adde
Correspondence Between DGP Brane Cosmology and 5D Ricci-flat Cosmology
We discuss the correspondence between the DGP brane cosmology and 5D
Ricci-flat cosmology by letting their metrics equal each other. By this
correspondence, a specific geometrical property of the arbitrary integral
constant I in DGP metric is given and it is related to the curvature of 5D
bulk. At the same time, the relation of arbitrary functions and in
a class of Ricci-flat solutions is obtained from DGP brane metric.Comment: 8 pages, 1 figure, accepted by MPLA, added referenc
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