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arXiv · 2606.11813

Sub-Riemannian Selberg Trace Formulae for Compact Quotients of SL(2,R) and Determinants of Sub-Laplacians

Fabrice Baudoin
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Abstract

We prove sub-Riemannian Selberg trace formulae for compact quotients of SL(2,R). Using the Fourier decomposition along the SO(2)-fibers, we reduce the heat trace computation to the Selberg trace formula for Maass Laplacians on the hyperbolic plane. The resulting formula has an identity contribution and a hyperbolic contribution, the latter involving a theta factor that records both the twisting character and the central sign of the chosen lift to SL(2,\mathbb R)). We then use this trace formula to compute the zeta-regularized determinant of the sub-Laplacian. The determinant formula is expressed as a universal factor depending only on the base hyperbolic surface times an explicit lift- and character-dependent Selberg-type product.

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Fabrice Baudoin. 2026-09-07. Sub-Riemannian Selberg Trace Formulae for Compact Quotients of SL(2,R) and Determinants of Sub-Laplacians. https://arxiv.org/abs/2606.11813

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