Gravitating spinor torsional BTZ solution

P. D. Alvarez; J. Ortiz; J. Zanelli

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arXiv · 2509.03362

Gravitating spinor torsional BTZ solution

P. D. Alvarez·J. Ortiz·J. Zanelli

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Abstract

We construct exact analytic solutions for a supersymmetric Chern-Simons theory with matter fields in the adjoint representation (unconventional supersymmetry). The configurations correspond to gravitating spinor fields on BTZ geometries with torsion. Although the spinor profiles exhibit divergent behavior near the black hole horizon, they yield finite contributions to conserved charges. We demonstrate that the spinors solve the full nonlinear field equations and satisfy integrability conditions derived from the Bianchi identities. The resulting energy momentum tensor is traceless, consistent with the Weyl invariance of the theory. We also analyze spinor solutions based on $adS_3$ Killing spinors and identify the conditions under which such backgrounds can support nontrivial spinor configurations. Our findings open the way to new fermionic sectors in 3D gravity with torsion, distinct from previously known perturbative deformations.

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P. D. Alvarez, J. Ortiz, J. Zanelli. 2025-09-03. Gravitating spinor torsional BTZ solution. https://arxiv.org/abs/2509.03362

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