Abstract
We propose a formula for computing the (moduli-dependent) contribution of multi-centered solutions to the total BPS index in terms of the (moduli-independent) indices associated to single-centered solutions. The main tool in our analysis is the computation of the refined index \( {\text{Tr}}{\left( { - y} \right)^{2{J_3}}} \) of configurational degrees of freedom of multi-centered BPS black hole solutions in \( \mathcal{N} = 2 \) supergravity by localization methods. When the charges carried by the centers do not allow for scaling solutions (i.e. solutions where a subset of the centers can come arbitrarily close to each other), the phase space of classical BPS solutions is compact and the refined index localizes to a finite set of isolated fixed points under rotations, corresponding to collinear solutions. When the charges allow for scaling solutions, the phase space is non-compact but appears to admit a compactification with finite volume and additional non-isolated fixed points. We give a prescription for determining the contributions of these fixed submanifolds by means of a ‘minimal modification hypothesis’, which we prove in the special case of dipole halo configurations.
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Manschot, J., Pioline, B. & Sen, A. A fixed point formula for the index of multi-centered \( \mathcal{N} = 2 \) black holes. J. High Energ. Phys. 2011, 57 (2011). https://doi.org/10.1007/JHEP05(2011)057
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DOI: https://doi.org/10.1007/JHEP05(2011)057