Analytic torsion formula for cones over odd-dimensional spheres

Let CαSlsinα2p1C_\alpha S^{2p-1}_{l\sin\alpha} be the cone of angle α\alpha and length l>0l>0 over the odd-dimensional sphere S2p1S^{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

logT(CαSlsinα2p1)=12logVol(CαSlsinα2p1)+j=0p12pjj!(2(pj)1)!!h=0j(jh)(1)hcsc2(jh)α2(pj+h)1(2p1)!sin2p1α4p(p1)!.\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.

Sources & referencesView supporting material

Primary source

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

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