Chandrashekhar Khare (UCLA)

26 May 2023

Location and Registration

  • Date/Time: The lecture takes place at 3pm 26th May 2023, followed be a reception from 4pm
  • Location:
    • King’s College London, Strand Campus, King’s Building, Anatomy Lecture Theatre (K6.29).
    • Entry is via the Strand opposite St Mary Le Strand Church. Subsequent directions will be provided.
  • Registration is required for entry into King’s College London. Registration is free and open to all via the form below. Registration closes on 23th May.
  • For enquiries relating to this event, please email

The Shimura-Taniyama-Weil conjecture and beyond

The Shimura-Taniyama-Weil modularity conjecture asserts that all elliptic curves over Q arise as images of quotients of the Poincare upper half plane by congruence subgroups of the modular group SL2(Z).  Wiles proved Fermat’s Last Theorem by establishing the modularity of semistable elliptic curves over Q. Subsequent work of Breuil-Conrad-Diamond-Taylor established the modularity of elliptic  curves over Q in full generality. My work with J-P. Wintenberger gave a proof of  the generalized Shimura-Taniyama-Weil conjecture which asserts that all “odd, rank 2 motives over Q” are modular. This is  a corollary of our proof of Serre’s modularity conjecture.

Very little is known when one looks at the same question over finite extensions of Q. I will talk about the recent beautiful  work of  Ana Caraiani and James Newton which proves modularity of all elliptic  curves over Q(i). An input into their proof is a result, proved in joint work with Patrick Allen and Jack Thorne, that proves the analog  of Serre’s conjecture for mod 3 representations that arise from elliptic  curves over Q(i).

My talk will give a general introduction to this circle of ideas centred around the modularity conjecture for motives and Galois  representations over number fields. We know only fragments of what is  conjectured, but what little we know is already quite remarkable!

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