Generic lens spaces are spectrally unique

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For positive integers nn and qq, let L(n,q)\mathfrak L(n,q) be the isometry classes of (2n−1)(2n-1)-dimensional lens spaces with fundamental group of order qq. Define the spectrally unique subset

L∙(n,q)=L∈L(n,q):Spec⁡(L)≠Spec⁡(L′)∀L′≠L in L(n,q).\mathfrak L^{\bullet}(n,q)=\\{L\in\mathfrak L(n,q):\operatorname{Spec}(L)\neq\operatorname{Spec}(L')\quad\forall L'\neq L\text{ in }\mathfrak L(n,q)\\}.

For x>0x>0, set

\mathcal U_n(x)=\frac{\sum_{q\leq x}\\#\mathfrak L^{\bullet}(n,q)}{\sum_{q\leq x}\\#\mathfrak L(n,q)}.

Generic lens-space spectral uniqueness conjecture.

lim⁡x→∞Un(x)=1\lim_{x\to\infty}\mathcal U_n(x)=1

for all n∈Nn\in\mathbb N. This is a proposed extension of Wolpert's generic spectral-uniqueness results for Riemann surfaces and flat tori. Since the space of lens spaces has no natural topology, the conjecture uses density among spaces whose fundamental-group order is at most xx; the source mentions numerical evidence but does not state a proof.

References

Primary source

Emilio A. Lauret and Benjamin Linowitz, “The spectral geometry of hyperbolic and spherical manifolds: analogies and open problems”, arXiv:2305.10950 (2024).

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