3,104 research outputs found
Hawking and Page on the brane
We show that the Hawking-Page phase transition of a CFT on AdS_{d-1} weakly
coupled to gravity has a dual bulk description in terms of a phase transition
between a black string and a thermal gas on AdS_{d}. At even lower temperatures
the black string develops a Gregory Laflamme instability, which is dual to
black hole evaporation in the boundary theory.Comment: 8 pages, 1 figure; v2: typos in some formulas corrected; v3:
discussion improve
Notes on Properties of Holographic Matter
Probe branes with finite worldvolume electric flux in the background created
by a stack of Dp branes describe holographically strongly interacting
fundamental matter at finite density. We identify two quantities whose leading
low temperature behavior is independent of the dimensionality of the probe
branes: specific heat and DC conductivity. This behavior can be inferred from
the dynamics of the fundamental strings which provide a good description of the
probe branes in the regime of low temperatures and finite densities. We also
comment on the speed of sound on the branes and the temperature dependence of
DC conductivity at vanishing charge density.Comment: 18 pages, 2 figures; v2: corrected error in Section 6, conclusions
unchanged; v3: improved figures and added clarifying comment
Localizing global hedgehogs on the brane
We investigate the localization of 4D topological global defects on the brane
embedded in 5D. The defects are induced by 5D scalar fields with a
symmetry-breaking potential. Taking an ansatz which separates the scalar field
into the 4D and the extra-D part, we find that the static-hedgehog
configuration is accomplished and the defects are formed only in the
background. In the extra dimension, the localization amplitude
for the 4D defects is high where the warp factor is high.Comment: 17 pages, revte
Bulk metric of brane world models and submanifolds in 6D pseudo-Euclidean space-time
In this short note, five-dimensional brane world models with dS_{4} metric on
the branes are discussed. The explicit coordinate transformations, which show
the equivalence between the bulk metric of these brane world models and the
metric induced on an appropriate submanifolds in the flat six-dimensional
pseudo-Euclidean space-time, are presented. The cases of the zero and non-zero
cosmological constant in the bulk are discussed in detail.Comment: 5 pages, typos correcte
Electric-Magnetic Duality and Topological Insulators
We work out the action of the SL(2,Z) electric-magnetic duality group for an
insulator with a non-trivial permittivity, permeability and theta-angle. This
theory has recently been proposed to be the correct low-energy effective action
for topological insulators. As applications, we give manifestly SL(2,Z)
covariant expressions for the Faraday rotation at orthogonal incidence at the
interface of two such materials, as well as for the induced magnetic and
electric charges, slightly clarifying the meaning of expressions previously
derived in the literature. We also use electric-magnetic duality to find a
gravitational dual for a strongly coupled version of this theory using the
AdS/CFT correspondence.Comment: 4 pages; version accepted by PR
Hadron Masses and Screening from AdS Wilson Loops
We show that in strongly coupled N=4 SYM the binding energy of a heavy and a
light quark is independent of the strength of the coupling constant. As a
consequence we are able to show that in the presence of light quarks the analog
of the QCD string can snap and color charges are screened. The resulting
neutral mesons interact with each other only via pion exchange and we estimate
the massesComment: 4 pages, revte
Surface Plasmons and Topological Insulators
We study surface plasmons localized on interfaces between topologically
trivial and topologically non-trivial time reversal invariant materials in
three dimensions. For the interface between a metal and a topological insulator
the magnetic polarization of the surface plasmon is rotated out of the plane of
the interface; this effect should be experimentally observable by exciting the
surface plasmon with polarized light. More interestingly, we argue that the
same effect also is realized on the interface between vacuum and a doped
topological insulator with non-vanishing bulk carrier density.Comment: 6 pages, 1 figure; v2: typo in eq. (27) correcte
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