Kavli Affiliate: Andrei Okounkov
| Summary:
For a split reductive group $^L G$ over a global field, we determine the spectrum of the spherical Hecke algebra coming from the unramified Eisenstein series for the minimal parabolic $^L B$. This is done using a certain decomposition of the Springer stack $T^*(B backslash G/ B)$ for the Langlands dual group in the additive group of cobordisms of cohomologically proper derived quotient stacks.
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