Testing Effective String Models of Black Holes with Fixed Scalars

Details Testing Effective String Models of Black Holes with Fixed Scalars Testing Effective String Models of Black Holes with Fixed Scalars

1997-03-30

arxiv.org/abs/hep-th/9703216v2

Phys.Rev. D56 (1997) 2173-2179

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, harvmac; minor typos corrected

Scientific paper

10.1103/PhysRevD.56.2173

We solve the problem of mixing between the fixed scalar and metric fluctuations. First, we derive the decoupled fixed scalar equation for the four-dimensional black hole with two different charges. We proceed to the five-dimensional black hole with different electric (1-brane) and magnetic (5-brane) charges, and derive two decoupled equations satisfied by appropriate mixtures of the original fixed scalar fields. The resulting greybody factors are proportional to those that follow from coupling to dimension (2,2) operators on the effective string. In general, however, the string action also contains couplings to chiral operators of dimension (1,3) and (3,1), which cause disagreements with the semiclassical absorption cross-sections. Implications of this for the effective string models are discussed.

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