2021/02/21 by U. K. Anandavardhanan, Anandavardhanan, U. K.
Mathematics · #11F70 #22E50 #Advanced Algebra and Geometry #Algebraic Geometry and Number Theory #FOS: Mathematics #Number Theory (math.NT) #Representation Theory (math.RT) #advanced mathematical theories
paper · pdf · doi:10.48550/arxiv.2102.10602
openalex publication_date 2021/02/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
An irreducible smooth representation of a p-adic group G is said to be distinguished with respect to a subgroup H if it admits a non-trivial H-invariant linear form. When H is the fixed group of an involution on G it is suggested by the works of Hervé Jacquet from the nineties that distinction can be characterized in terms of the principle of functoriality. If the involution is the Galois involution then a recent conjecture of Dipendra Prasad predicts a formula for the dimension of the space of invariant linear forms which once again involves base change. We will describe the proof of this conjecture (in the generic case) for SL(n) which is joint work with Dipendra Prasad. Then we describe one more newly discovered connection between distinction and base change which is that base change information appears in the constant of proportionality between two natural invariant linear forms on a distinguished representation. This latter result is for discrete series for GL(n) and is joint with Nadir Matringe. This paper is a report on the author's talk in the International Colloquium on Arithmetic Geometry held in January 2020 at TIFR Mumbai.