Absorption of fixed scalar in scattering off 4D N=4 black holes
Abstract
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 ≠ 0), the dilaton as a fixed scalar is the only propagating mode with P=Q, h1=h2=0 and F = -G = 2φ. 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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