120 research outputs found
Electric Black Holes in Type 0 String Theory
We discuss AdS_{2+1} (BTZ) black holes arising in type 0 string theory
corresponding to D1-D5 and F1-NS5 bound states. In particular we describe a new
family of non-dilatonic solutions with only Dp_{+}, that is ``electric''
branes. These solutions are distinguished by the absence of fermions in the
world volume theory which is an interacting CFT. They can not be obtained as a
projection of a type II BPS-configuration. As for previous type 0 backgrounds
linear stability is guaranteed only if the curvature is of the order of the
string scale where alpha' corrections cannot be excluded. Some problems
concerning the counting of states are discussed.Comment: some clarifications in section
Quasi Normal Modes
We review different applications of quasinormal modes to black hole physics,
string theory and thermalisation in quantum field theory. In particular, we
describe the the relation between quasi normal modes of AdS black holes and the
time scale for thermalisation in strongly coupled, large conformal field
theory. We also discuss the problem of unitarity within this approach.Comment: Talk given at 36th International Symposium Ahrenshoop on the Theory
of Elementary Particles: Recent Developments in String/M-Theory and Field
Theory, Berlin, Germany, 26-30 Aug 2003, to appear in Fortsch.Phy
Formation of Black Holes in Topologically Massive Gravity
We present an exact solution in 3-dimensional topologically massive gravity
with negative cosmological constant which dynamically interpolates between a
past horizon and a chiral AdS pp-wave. Similarly, upon time reversal, one
obtains an AdS pp-wave with a future event horizonComment: Improved presentation. Extended discussion of linear stability and
regularity of the metric. Added reference
Open Superstring Field Theory on the Restricted Hilbert Space
Recently an action for open superstring field theory was proposed where the
Neveu-Schwarz sector is formulated in the large Hilbert space while the Ramond
sector lives in a restriction of the small Hilbert space. The purpose of this
note is to clarify the relation of the restricted Hilbert space with other
approaches and to formulate open superstring field theory entirely in the small
Hilbert space.Comment: 10 page
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