Abstract
We consider supersymmetric near-horizon geometries in heterotic supergravity up to two loop order in sigma model perturbation theory. We identify the conditions for the horizons to admit enhancement of supersymmetry. We show that solutions which undergo supersymmetry enhancement exhibit an \( \mathfrak{s}\mathfrak{l}\left(2,\kern0.5em \mathbb{R}\right) \) symmetry, and we describe the geometry of their horizon sections. We also prove a modified Lichnerowicz type theorem, incorporating α′ corrections, which relates Killing spinors to zero modes of near-horizon Dirac operators. Furthermore, we demonstrate that there are no AdS2 solutions in heterotic supergravity up to second order in α′ for which the fields are smooth and the internal space is smooth and compact without boundary. We investigate a class of nearly supersymmetric horizons, for which the gravitino Killing spinor equation is satisfied on the spatial cross sections but not the dilatino one, and present a description of their geometry.
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Fontanella, A., Gutowski, J.B. & Papadopoulos, G. Anomaly corrected heterotic horizons. J. High Energ. Phys. 2016, 121 (2016). https://doi.org/10.1007/JHEP10(2016)121
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DOI: https://doi.org/10.1007/JHEP10(2016)121