9 research outputs found
On the origin of thermal string gas
We investigate decaying D-branes as the origin of the thermal string gas of
string gas cosmology. We consider initial configurations of low-dimensional
branes and argue that they can time evolve to thermal string gas. We find that
there is a range in the weak string coupling and fast brane decay time regimes,
where the initial configuration could drive the evolution of the dilaton to
values, where exactly three spacelike directions grow large.Comment: 16 pages, 4 figures, v2: references adde
The logarithmic triplet theory with boundary
The boundary theory for the c=-2 triplet model is investigated in detail. In
particular, we show that there are four different boundary conditions that
preserve the triplet algebra, and check the consistency of the corresponding
boundary operators by constructing their OPE coefficients explicitly. We also
compute the correlation functions of two bulk fields in the presence of a
boundary, and verify that they are consistent with factorisation.Comment: 43 pages, LaTeX; v2: references added, typos corrected, footnote 4
adde
Rolling tachyon in anti-de Sitter space-time
We study the decay of the unstable D-particle in three-dimensional anti-de
Sitter space-time using worldsheet boundary conformal field theory methods. We
test the open string completeness conjecture in a background for which the
phase space available is only field-theoretic. This could present a serious
challenge to the claim. We compute the emission of closed strings in the AdS(3)
x S^3 x T^4 background from the knowledge of the exact corresponding boundary
state we construct. We show that the energy stored in the brane is mainly
converted into very excited long strings. The energy stored in short strings
and in open string pair production is much smaller and finite for any value of
the string coupling. We find no "missing energy" problem. We compare our
results to those obtained for a decay in flat space-time and to a background in
the presence of a linear dilaton. Some remarks on holographic aspects of the
problem are made.Comment: JHEP style, 45 pages, one figure; v2: typos corrected, references
added, version to appear in JHE
Closed String Tachyon Condensation: An Overview
These notes are an expanded version of a review lecture on closed string
tachyon condensation at the RTN workshop in Copenhagen in September 2003. We
begin with a lightning review of open string tachyon condensation, and then
proceed to review recent results on localized closed string tachyon
condensation, focusing on two simple systems, C/Z_n orbifolds and twisted
circle compactifications.Comment: harvmac, 59 pages; references adde
Emergent Schrodinger geometries from mass-deformed CFT
We study an M-theory solution for the holographic flow of AdS4 times
Sasaki-Einstein 7-manifolds with skew-whiffing, perturbed by a mass operator.
The infrared solution contains the 5 dimensional Schrodinger geometry after
considering the gravity dual of the standard non-relativistic limit of
relativistic field theories. The mass deformation of the field theory is
discussed in detail for the case with 7 manifold being a round sphere.Comment: 20 pages, 1 figure. v2: references added, minor correction