Depth-zero base change compatibility for tamely ramified extensions
Depth-zero base change compatibility for tamely ramified extensions
Let be a local field, let be a cyclic tamely ramified extension, and let be a reductive group over . For a point in the building of , let and be the corresponding parahoric subgroups, with connected reductive quotients and over . If contains , where is an irreducible cuspidal representation of , Depth-zero base change compatibility for tame ramification. Suppose there is a base change lifting taking -packets for to -packets for . For every depth-zero -packet for and containing , some contains
for some irreducible representation of contained in . The assertion proposes a finite-group compatibility even though the reductive quotient need not be obtained by restriction of scalars in the ramified case. The source gives no resolution status for this broader conjecture, so it is recorded as open.
Sources & referencesView supporting material
Primary source
Jeffrey D. Adler and Joshua M. Lansky, “Depth-zero base change for ramified U(2,1)”, arXiv:0807.1528 (2009).
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