Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-05-26
Phys.Rev.D56:4994-5007,1997
Physics
High Energy Physics
High Energy Physics - Theory
33 pages, latex; minor typos corrected; version to appear in PRD
Scientific paper
10.1103/PhysRevD.56.4994
We derive the wave equation for a minimally coupled scalar field in the background of a general rotating five-dimensional black hole. It is written in a form that involves two types of thermodynamic variables, defined at the inner and outer event horizon, respectively. We model the microscopic structure as an effective string theory, with the thermodynamic properties of the left and right moving excitations related to those of the horizons. Previously known solutions to the wave equation are generalized to the rotating case, and their regime of validity is sharpened. We calculate the greybody factors and interpret the resulting Hawking emission spectrum microscopically in several limits. We find a U-duality invariant expression for the effective string length that does not assume a hierarchy between the charges. It accounts for the universal low-energy absorption cross-section in the general non-extremal case.
Cvetic Mirjam
Larsen Finn
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