1,120 research outputs found
A Possible Resolution of the Black Hole Information Puzzle
The problem of information loss is considered under the assumption that the
process of black hole evaporation terminates in the decay of the black hole
interior into a baby universe. We show that such theories can be decomposed
into superselection sectors labeled by eigenvalues of the third-quantized baby
universe field operator, and that scattering is unitary within each
superselection sector. This result relies crucially on the quantum-mechanical
variability of the decay time. It is further argued that the decay rate in the
black hole rest frame is necessarily proportional to , where
is the total entropy produced during the evaporation process,
entailing a very long-lived remnant.Comment: 15 pages, 3 uuencoded figures. Revised version contains some
notational simplification
On the timelike Liouville three-point function
In a recent paper, D. Harlow, J. Maltz, and E. Witten showed that a
particular proposal for the timelike Liouville three-point function, originally
due to Al. Zamolodchikov and to I. Kostov and V. Petkova, can actually be
computed by the original Liouville path integral evaluated on a new integration
cycle. Here, we discuss a Coulomb gas computation of the timelike three-point
function and show that an analytic extension of the Selberg type integral
formulas involved reproduces the same expression, including the adequate
normalization. A notable difference with the spacelike calculation is pointed
out.Comment: 11 pages. v2 comments and references added. Appropriate credit is
given to Ref. arXiv:hep-th/0512346, where the Coulomb gas computation of the
c<1 theory has already been discusse
Statistical Mechanics of Three-dimensional Kerr-de Sitter Space
The statistical computation of the (2+1)-dimensional Kerr-de Sitter space in
the context of the {\it classical} Virasoro algebra for an asymptotic isometry
group has been a mystery since first, the degeneracy of the states has the
right value only at the infinite boundary which is casually disconnected from
our universe, second, the analyses were based on the unproven Cardy's formula
for complex central charge and conformal weight. In this paper, I consider the
entropy in Carlip's "would-be gauge" degrees of freedom approach instead. I
find that it agree with the Bekenstein-Hawking entropy but there are no the
above problems. Implications to the dS/CFT are noted.Comment: Added comments about diffeomorphism generators and Wheeler-de Witt
equation; Added references; Accpected in CQ
N=2 Heterotic Superstring and its Dual Theory in Five Dimensions
We study quantum effects in five dimensions in heterotic superstring theory
compactified on K_3 x S_1 and analyze the conjecture that its dual effective
theory is eleven-dimensional supergravity compactified on a Calabi-Yau
threefold. This theory is also equivalent to type II superstring theory
compactified on the same Calabi-Yau manifold, in an appropriate large volume
limit. In this limit the conifold singularity disappears and is replaced by a
singularity associated to enhanced gauge symmetries, as naively expected from
the heterotic description. Furthermore, we exhibit the existence of additional
massless states which appear in the strong coupling regime of the heterotic
theory and are related to a different type of singular points on Calabi-Yau
threefolds.Comment: 26 pages, LaTe
D-brane recoil
It is shown that there are logarithmic operators in D-brane backgrounds that
lead to infrared divergences in open string loop amplitudes. These divergences
can be cancelled by changing the closed string background by operators that
correspond to the D-brane moving with constant velocity after some instant in
time, since it is precisely such operators that give rise to the appropriate
ultraviolet divergences in the closed string channel.Comment: Plain TeX, 5 page
Heterotic instantons and solitons in anomaly-free supergravity
We extend the classical heterotic instanton solutions to all orders in
using the equations of anomaly-free supergravity, and discuss the
relation between these equations and the string theory -functions.Comment: 10 page
Microstates of Four-Dimensional Rotating Black Holes from Near-Horizon Geometry
We show that a class of four-dimensional rotating black holes allow
five-dimensional embeddings as black rotating strings. Their near-horizon
geometry factorizes locally as a product of the three-dimensional anti-deSitter
space-time and a two-dimensional sphere (AdS_3 x S^2), with angular momentum
encoded in the global space-time structure. Following the observation that the
isometries on the AdS_3 space induce a two-dimensional (super)conformal field
theory on the boundary, we reproduce the microscopic entropy with the correct
dependence on the black hole angular momentum.Comment: 11 pages, revte
The 2D analogue of the Reissner-Nordstrom solution
A two-dimensional (2D) dilaton gravity model, whose static solutions have the
same features of the Reissner-Nordstrom solutions, is obtained from the
dimensional reduction of a four-dimensional (4D) string effective action
invariant under S-duality transformations. The black hole solutions of the 2D
model and their relationship with those of the 4D theory are discussed.Comment: 5 pages, Plain-Tex, no figure
R^2 Corrections for 5D Black Holes and Rings
We study higher-order corrections to two BPS solutions of 5D supergravity,
namely the supersymmetric black ring and the spinning black hole. Due in part
to our current relatively limited understanding of F-type terms in 5D
supergravity, the nature of these corrections is less clear than that of their
4D cousins. Effects of certain terms found in Calabi-Yau compactification
of M-theory are specifically considered. For the case of the black ring, for
which the microscopic origin of the entropy is generally known, the
corresponding higher order macroscopic correction to the entropy is found to
match a microscopic correction, while for the spinning black hole the
corrections are partially matched to those of a 4D black hole.Comment: 9 page
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