Analytic torsion formula for cones over odd-dimensional spheres

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Let CαSlsin⁡α2p−1C_\alpha S^{2p-1}_{l\sin\alpha} be the cone of angle α\alpha and length l>0l>0 over the odd-dimensional sphere S2p−1S^{2p-1}, equipped with the standard metric induced by the immersion in Rm+1\mathbb{R}^{m+1} and absolute boundary conditions. Assume p>0p>0. Analytic torsion conjecture. The analytic torsion satisfies

log⁡T(CαSlsin⁡α2p−1)=12log⁡Vol⁡(CαSlsin⁡α2p−1)+∑j=0p−12p−jj!(2(p−j)−1)!!∑h=0j(jh)(−1)hcsc⁡2(j−h)α2(p−j+h)−1(2p−1)!sin⁡2p−1α4p(p−1)!.\begin{aligned} \log T(C_\alpha S^{2p-1}_{l\sin\alpha})={}&\frac{1}{2}\log \operatorname{Vol}(C_\alpha S^{2p-1}_{l\sin\alpha})\\ &+\sum_{j=0}^{p-1}\frac{2^{p-j}}{j!(2(p-j)-1)!!}\sum_{h=0}^{j}\binom{j}{h}\frac{(-1)^h\operatorname{csc}^{2(j-h)}\alpha}{2(p-j+h)-1}\frac{(2p-1)!\sin^{2p-1}\alpha}{4^p(p-1)!}. \end{aligned}

This formula agrees with the corresponding expression for cones over the circle and over the 33-sphere, where it is a theorem for p<3p<3; the conjecture concerns the additional contribution of the singularity in higher odd dimensions.

References

Primary source

L. Hartmann and M. Spreafico, “The analytic torsion of a cone over a sphere”, arXiv:0902.3887 (2009).

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