Extremal Black Holes As Fundamental Strings

Details Extremal Black Holes As Fundamental Strings Extremal Black Holes As Fundamental Strings

1995-10-18

arxiv.org/abs/hep-th/9510134v1

Nucl.Phys. B475 (1996) 645-678

Physics

High Energy Physics

High Energy Physics - Theory

38 pages, 1 encapsulated postscript figure, uses harvmac.tex and epsf.tex

Scientific paper

10.1016/0550-3213(96)00315-X

We show that polarization dependent string-string scattering provides new evidence for the identification of the Dabholkar-Harvey (DH) string solution with the heterotic string itself. First, we construct excited versions of the DH solution which carry arbitrary left-moving waves yet are annihilated by half the supersymmetries. These solutions correspond in a natural way to Bogomolny-bound-saturating excitations of the ground state of the heterotic string. When the excited string solutions are compactified to four dimensions, they reduce to Sen's family of extremal black hole solutions of the toroidally compactified heterotic string. We then study the large impact parameter scattering of two such string solutions. We develop methods which go beyond the metric on moduli space approximation and allow us to read off the subleading polarization dependent scattering amplitudes. We find perfect agreement with heterotic string tree amplitude predictions for the scattering of corresponding string states. Taken together, these results clearly identify the string states responsible for Sen's extremal black hole entropy. We end with a brief discussion of implications for the black hole information problem.

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