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Eigenfunctions Seminar

Title: On spectral gaps above the tempered gap
Speaker: Vikram Giri (University of Zurich, Switzerland)
Date: 09 January 2026
Time: 3 – 5 pm (with a 15 minute break in between)
Venue: LH-1, Mathematics Department

We will explore the possibility of getting uniform spectral gaps for some invariant differential operators on hyperbolic manifolds. We’ll begin with some basics of hyperbolic geometry, relate the spectra of hyperbolic manifolds to representation theory, and explain the term `tempered gap’. We’ll then construct a sequence of spin hyperbolic surfaces with a uniform spectral gap for the Dirac operator and a sequence of hyperbolic 3-folds with a uniform gap for the Hodge Laplacian on coclosed 1-forms. Based on joint works with A. Abdurrahman, A. Adve, B. Lowe, and J. Zung.


Contact: +91 (80) 2293 2711, +91 (80) 2293 2265 ;     E-mail: chair.math[at]iisc[dot]ac[dot]in
Last updated: 09 Jan 2026