Categorical trace conjecture for the diagonal correspondence
Categorical trace conjecture for the diagonal correspondence
Let be a reductive group, let , and let . Let be the Cartan involution and let be a local system on the dual group. Set and choose a Hecke eigensheaf on . Its Verdier dual is a Hecke eigensheaf with eigenvalue , and set . Let , let be irreducible, and put . Let be the isotypic-part map, and let be the diagonal cohomological correspondence induced by the Hecke stack. Write for evaluation. Categorical trace conjecture.
This predicts that the trace of the diagonal correspondence on the Shtuka isotypic part is the Frobenius trace on the compactly supported cohomology of the eigensheaf tensor its Verdier dual, multiplied by the natural representation-theoretic evaluation map. The supplied context gives no resolution status.
Sources & referencesView supporting material
Primary source
Zeyu Wang, “Special Cycle on Shtukas and Categorical Trace”, arXiv:2509.05526 (2025).
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