169 research outputs found
Stringy Stability of Dilaton Black Holes in 5-Dimensional Anti-de Sitter Space
Flat electrical charged black holes in 5-dimensional anti-de Sitter space
have been applied to the study of the phase diagram of quark matter via AdS/CFT
correspondence. In such application it is argued that since the temperature of
the quark gluon plasma is bounded away from zero, the dual black hole cannot be
arbitrarily cold, but becomes unstable due to stringy instability once it
reaches sufficiently low temperature. We study the stringy stability of flat
dilaton black holes with dilaton coupling in asymptotically anti-de
Sitter space and show that unlike the purely electrically charged black hole,
these dilaton black holes do not suffer from stringy instability.Comment: Published in Proceedings of the Conference in Honor of Murray
Gell-Mann's 80th Birthday, p.583-590, World Scientific, 2010, Singapor
Hawking Evaporation Time Scale of Topological Black Holes in Anti-de Sitter Spacetime
It was recently pointed out that if an absorbing boundary condition is
imposed at infinity, an asymptotically anti-de Sitter Schwarzschild black hole
with a spherical horizon takes only a finite amount of time to evaporate away
even if its initial mass is arbitrarily large. We show that this is a rather
generic property in AdS spacetimes: regardless of their horizon topologies,
neutral AdS black holes in general relativity take about the same amount of
time to evaporate down to the same size of order L, the AdS length scale. Our
discussion focuses on the case in which the black hole has toral event horizon.
A brief comment is made on the hyperbolic case, i.e. for black holes with
negatively curved horizons.Comment: Published versio
GUP-Corrected Black Hole Thermodynamics and the Maximum Force Conjecture
We show that thermodynamics for an asymptotically flat Schwarzschild black
hole leads to a force of magnitude . This remains true if one
considers the simplest form of correction due to the generalized uncertainty
principle. We comment on the maximum force conjecture, the subtleties involved,
as well as the discrepancies with previous results in the literature.Comment: Fixed a typo in Eq.(11) of the published versio
Charge Loss (or the Lack Thereof) for AdS Black Holes
The evolution of evaporating charged black holes is complicated to model in
general, but is nevertheless important since the hints to the Information Loss
Paradox and its recent firewall incarnation may lie in understanding more
generic geometries than that of Schwarzschild spacetime. Fortunately, for
sufficiently large asymptotically flat Reissner-Nordstrom black holes, the
evaporation process can be modeled via a system of coupled linear ordinary
differential equations, with charge loss rate governed by Schwinger
pair-production process. The same model can be generalized to study the
evaporation of AdS Reissner-Nordstrom black holes with flat horizon. It was
recently found that such black holes always evolve towards extremality since
charge loss is inefficient. This property is completely opposite to the
asymptotically flat case in which the black hole eventually loses its charges
and tends towards Schwarzschild limit. We clarify the underlying reason for
this different behavior.Comment: References updated. Published in JHE
When Is Holography Consistent?
Holographic duality relates two radically different kinds of theory: one with
gravity, one without. The very existence of such an equivalence imposes strong
consistency conditions which are, in the nature of the case, hard to satisfy.
Recently a particularly deep condition of this kind, relating the minimum of a
probe brane action to a gravitational bulk action (in a Euclidean formulation),
has been recognised; and the question arises as to the circumstances under
which it, and its Lorentzian counterpart, are satisfied. We discuss the fact
that there are physically interesting situations in which one or both versions
might, in principle, \emph{not} be satisfied. These arise in two distinct
circumstances: first, when the bulk is not an Einstein manifold, and, second,
in the presence of angular momentum. Focusing on the application of holography
to the quark-gluon plasma (of the various forms arising in the early Universe
and in heavy-ion collisions), we find that these potential violations never
actually occur. This suggests that the consistency condition is a "law of
physics" expressing a particular aspect of holography.Comment: 26 pages, two diagram
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