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Absorption of photons and fermions by black holes in four dimensions

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arxiv hep-th/9706100 v2 pith:44TZ63KK submitted 1997-06-12 hep-th

classification hep-th
keywords blackholesabsorptioncross-sectionseffectivefermionsphotonsstring
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The absorption of photons and fermions into four-dimensional black holes is described by equations which in certain cases can be analyzed using dyadic index techniques. The resulting absorption cross-sections for near-extremal black holes have a form at low energies suggestive of the effective string model. A coupling to the effective string is proposed for spin-0 and spin-1/2 fields of pure N=4 supergravity which respects the unbroken supersymmetry of extreme black holes and correctly predicts dilaton, axion, and fermion cross-sections up to an overall normalization.

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  1. Effective dynamics of open 2D CFTs

    hep-th 2025-07 conditional novelty 6.0 of 10

    The momentum-space thermal four-point response function of scalar primaries in an arbitrary 2D CFT is expressed as an infinite sum over global conformal blocks of Meijer G-functions.

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