A Very Effective String Model?

Abstract

Additional evidence is presented for a recently proposed effective string model, conjectured to hold throughout the parameter space of the basic 5 dimensional, triply charged black holes, which includes the effects of brane excitations, as well as momentum modes. We compute the low energy spacetime absorption coefficient $\sigma$ for the scattering of a triply-charged scalar field in the near extremal case, and conjecture an exact form for $\sigma$. It is shown that this form of $\sigma$ arises simply from the effective string model. This agreement encompasses both statistical factors coming from the Bose distributions of string excitations and a prefactor which depends on the effective string radius. An interesting feature of the effective string model is that the change in mass of the effective string system in an emission process is not equal to the change in the energies of the effective string excitations. If the model is valid, this may hold clues towards understanding back reaction due to Hawking radiation. A number of weak spots and open questions regarding the model are also noted.

19 pages, harvmac (b)

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• Greybody factors for rotating black holes in four dimensions
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Cited by in corpus (10)

• Logarithmic Corrections to Black Hole Entropy from the Cardy Formula
• Greybody Factors and Charges in Kerr/CFT
• The Bekenstein Formula and String Theory (N-brane Theory)
• Conformal Symmetry for Black Holes in Four Dimensions
• Greybody Factors for Black Holes in Four Dimensions: Particles with Spin
• Note on Thermodynamics Method of Black Hole/CFT Correspondence
• Black Hole Horizons and the Thermodynamics of Strings
• U-Duality, D-Branes and Black Hole Emission Rates: Agreements and Disagreements
• Anti-DeSitter Spaces and Nonextreme Black Holes
• Black Hole Graybody Factor and Black Hole Entropy