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T duality and Wald entropy formula in the Heterotic Superstring effective action at first order in $\alpha'$
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abstract
We consider the compactification on a circle of the Heterotic Superstring effective action to first order in the Regge slope parameter $\alpha'$ and re-derive the $\alpha'$-corrected Buscher rules first found in arXiv:hep-th/9506156 , proving the T duality invariance of the dimensionally-reduced action to that order in $\alpha'$. We use Iyer and Wald's prescription to derive an entropy formula that can be applied to black-hole solutions which can be obtained by a single non-trivial compactification on a circle and discuss its invariance under the $\alpha'$-corrected T duality transformations. This formula has been successfully applied to $\alpha'$-corrected 4-dimensional non-extremal Reissner-Nordstr\"om black holes in arXiv:1910.14324 and we apply it here to a heterotic version of the Strominger-Vafa 5-dimensional extremal black hole.
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Multicenter higher-derivative BPS black holes
Two- and three-charge BPS black holes of the torus-reduced heterotic action are rewritten in five-dimensional STU supergravity fields, and the resulting action is shown to differ from known N=2 R^2 invariants.
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