Non-BPS excitations of D-branes and black holes∗
نویسنده
چکیده
This note discusses some results on the non-BPS excitations of D-branes. We show that the excitation spectrum of a bound state of D-strings changes character when the length of the wrapping circle becomes less than ∼ g−1L(S). We review the observed relation between the low energy absorption cross-section of D-branes and the low energy absorption cross-section for black holes. We discuss various issues related to the information question for black holes.
منابع مشابه
Emission of charged particles from four- and five-dimensional black holes
Recently Das and Mathur found that the leading order Hawking emission rate of neutral scalars by near-extremal D = 5 black holes is exactly reproduced by a string theoretic model involving intersecting D-branes. We show that the agreement continues to hold for charged scalar emission. We further show that similar agreement can be obtained for a class of near-extremal D = 4 black holes using a m...
متن کاملConstituent Model of Extremal non-BPS Black Holes
We interpret extremal non-BPS black holes in four dimensions as threshold bound states of four 1/2-BPS constituents. We verify the no-force condition for each of the primitive constituents in the probe approximation. Our computations are for a seed solution with D0 − D4 charges and equal B-fields, but symmetries extend the result to any U-dual frame. We make the constituent model for the D0−D6 ...
متن کاملTASI Lectures on Black Holes in String Theory
This is a write-up of introductory lectures on black holes in string theory given at TASI-99. Topics discussed include: black holes, thermodynamics and the Bekenstein-Hawking entropy, the information problem; supergravity actions, conserved quantum numbers, supersymmetry and BPS states, units, duality and dimensional reduction, solution-generating; extremal M-branes and D-branes, smearing, prob...
متن کاملDAMTP-R/97/15, UPR-741-T, hep-th/9703204 Non-threshold D-brane bound states and black holes with non-zero entropy
We start with BPS-saturated configurations of two (orthogonally) intersecting M-branes and use the electro-magnetic duality or dimensional reduction along a boost, in order to obtain new p-brane bound states. In the first case the resulting configurations are interpreted as BPS-saturated non-threshold bound states of intersecting p-branes, and in the second case as p-branes intersecting at angl...
متن کاملNon - threshold D - brane bound states and black holes with non - zero entropy
We start with BPS-saturated configurations of two (orthogonally) intersecting M-branes and use the electro-magnetic duality or dimensional reduction along a boost, in order to obtain new p-brane bound states which are not marginally bound. In the first case the resulting configurations are interpreted as BPS-saturated non-threshold bound states of intersecting p-branes, and in the second case a...
متن کامل