Charlotte Chan



About Me

I am a CLE Moore Instructor and NSF Postdoctoral Fellow at MIT. I am interested in representation theory, number theory, and algebraic geometry.

In 2018/2019, I was an NSF Postdoctoral Fellow at Princeton University.

Before that, I was a graduate student at the University of Michigan under the advisement of Kartik Prasanna.

Here is a photo of me in front of the statue at Oberwolfach in April 2016.

Contact Info

Email: charchan [at] mit [dot] edu
Office: 2-231B; (617) 253-1798
Mail: Massachusetts Institute of Technology
Department of Mathematics
Headquarters Office
Simons Building (Building 2), Room 106
77 Massachusetts Avenue

Publications/Preprints

(Published or arXiv versions may differ from the local versions.)

  1. Cohomological representations of parahoric subgroups (joint with A. Ivanov)
    (pdf, 24 pages)

    We generalize a cohomological construction of representations due to Lusztig from the hyperspecial case to arbitrary parahoric subgroups of a reductive group over a local field which splits over an unramified extension. We compute the character of these representations on certain very regular elements.

    arXiv:1903.06153

  2. Affine Deligne--Lusztig varieties at infinite level (joint with A. Ivanov)
    (pdf, 67 pages)

    We construct an inverse limit of covers of affine Deligne--Lusztig varieties for GLn (and its inner forms) and prove that it is isomorphic to the semi-infinite Deligne--Lusztig variety. We calculate its cohomology and make a comparison with automorphic induction.

    arXiv:1811.11204

  3. Period identities of CM forms on quaternion algebras
    (pdf, 48 pages)

    For any two Hecke characters of a fixed quadratic extension, one can consider the two torus periods coming from integrating one character against the automorphic induction of the other. Because the corresponding L-functions agree, (the norms of) these periods---which occur on different quaternion algebras---are closely related by Waldspurger's formula. We give a direct proof of an explicit identity between the torus periods themselves.

    arXiv:1807.09435

  4. The cohomology of semi-infinite Deligne-Lusztig varieties
    (pdf, 42 pages)

    We prove a 1979 conjecture of Lusztig on the cohomology of semi-infinite Deligne--Lusztig varieties attached to division algebras over local fields. We also prove the two conjectures of Boyarchenko on these varieties.

    To appear in J. Reine Angew. Math.

    arXiv:1606.01795

  5. Deligne-Lusztig constructions for division algebras and the local Langlands correspondence, II
    (pdf, 31 pages) (published, 42 pages)

    We extend the results of arXiv:1406.6122 to arbitrary division algebras over an arbitrary non-Archimedean local field. We show that Lusztig's proposed p-adic analogue of Deligne-Lusztig varieties gives a geometric realization of the local Langlands and Jacquet-Langlands correspondences.

    Selecta Math., 24 (2018), no. 4, 3175--3216

    arXiv:1505.07185

  6. Deligne-Lusztig constructions for division algebras and the local Langlands correspondence
    (pdf, 61 pages)

    We compute a cohomological correspondence between representations proposed by Lusztig in 1979 and show that for quaternion algebras over a local field of positive characteristic, this correspondence agrees with that given by the local Langlands and Jacquet-Langlands correspondences.

    Adv. Math., 294 (2016), 332--383

    arXiv:1406.6122


This webpage is largely based off of my friend Zev Chonoles's webpage. A huge thank you to him for allowing me to use his html and css code!