We study D-branes in the Lorentzian signature 2D black hole in string theory. We use the technique of gauged WZW models to construct the associated boundary conformal field theories. The main focus of this work is to discuss the (semi-classical) world-volume geometries of the D-branes. We discuss comparison of our work with results in related gauged WZWmodels.

Extremal black holes in M-theory compactification on M × S are microscopically represented by fivebranes wrapping P × S, where M is a Calabi-Yau threefold and P is a four-cycle in M . Additional spacetime charges arise from momentum around the S and expectation values for the self-dual three-form field strength in the fivebrane. The microscopic entropy of the fivebrane as a function of all the ...

We study how black hole superradiance appears in string microscopic models of rotating black holes. In order to disentangle superradiance from finite-temperature effects, we consider an extremal, rotating D1-D5-P black hole that has an ergosphere and is not supersymmetric. We explain how the microscopic dual accounts for the superradiant ergosphere of this black hole. The bound 0 < ω < mΩH on s...

The purpose of this paper is to present a weighted kneading theory for one-dimensional maps with a hole. We consider extensions of the kneading theory of Milnor and Thurston to expanding discontinuous maps with a hole and introduce weights in the formal power series. This method allows us to derive techniques to compute explicitly the topological entropy, the Hausdorff dimension, and the escape...

We calculate the quantum corrections to the entropy of a very large black hole, coming from the theory of a D-dimensional, non-critical bosonic string. We show that, for D > 2, as a result of modular invariance the entropy is ultraviolet finite, although it diverges in the infrared (while for D = 2 the entropy contains both ultraviolet and infrared divergences). The issue of modular invariance ...

The exact decay rate for emission of massless minimally coupled scalar elds by a non-extremal black hole in 2 + 1 dimensions is obtained. At low energy, the decay rate into scalars with zero angular momentum is correctly reproduced within conformal eld theory. The conformal eld theory has both left-and right-moving sectors and their contribution to the decay rate is associated naturally with le...

In the present work the approach density matrix deformation earlier developed by the author to study a quantum theory of the Early Universe (Planck’s scales) is applied to study a quantum theory of black holes. On this basis the author investigates the information paradox problem, entropy of the black hole remainders after evaporation, and consistency with the holographic principle. The possibi...

The exact decay rate for emission of massless minimally coupled scalar fields by a non-extremal black hole in 2 + 1 dimensions is obtained. At low energy, the decay rate into scalars with zero angular momentum is correctly reproduced within conformal field theory. The conformal field theory has both leftand rightmoving sectors and their contribution to the decay rate is associated naturally wit...

We further study the nonperturbative formulation of two-dimensional black holes. We find a nonlinear differential equation satisfied by the tachyon in the black hole background. We show that singularities in the tachyon field configurations are always associated with divergent semiclassical expansions and are absent in the exact theory. We also discuss how the Euclidian black hole emerges from ...

We study regular and black hole solutions to the coupled classical Einstein–Yang-Mills– Higgs system. It has long been thought that black hole solutions in the spontaneously broken phase of such a theory could have no nontrivial field structure outside of the horizon. We first show that the standard black hole no-hair theorem underlying this belief, although true in the abelian setting, does no...