Birkhoff theorem for anR+R2theory of gravity with torsion

Abstract
We investigate the gravitational Lagrangian LG=(c416πG)R(c16παG) Rαβγδ Rαβγδ, where the curvatures are computed from a metric-compatible connection with torsion. We prove that the Schwarzschild metric and its torsion-free connection constitute the unique O(3) spherically symmetric (including reflections) solution to the vacuum field equations of LG.

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