Absorption of fixed scalar in scattering off 4D N=4 black holes

Details Absorption of fixed scalar in scattering off 4D N=4 black holes Absorption of fixed scalar in scattering off 4D N=4 black holes

1997-04-29

arxiv.org/abs/hep-th/9704199v3

Phys.Lett. B410 (1997) 6-12

Physics

High Energy Physics

High Energy Physics - Theory

11 pages in RevTeX, no figures, minor correction is included(third version)

Scientific paper

10.1016/S0370-2693(97)00794-6

We perform the perturbation analysis of the black holes in the 4D, N=4 supergravity. Analysis around the black holes reveals a complicated mixing between the dilaton and other fields (metric and two U(1) Maxwell fields). It turns out that considering both s-wave (l=0) and higher momentum modes (l \neq 0), the dilaton as a fixed scalar is the only propagating mode with $P=Q, h_1=h_2=0$ and $F = -G = 2\phi$. We calculate the absorption cross-section for scattering of low frequency waves of fixed scalar and U(1) Maxwell fields off the extremal black hole.

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