Vesselin Dimitrov
Vesselin Dimitrov is a mathematician specialising in number theory. He is a professor at California Institute of Technology.
Early life and education
Vesselin Dimitrov was born in Sofia, Bulgaria, in 1986. He graduated from the National Gymnasium of Natural Sciences and Mathematics "Academician Lyubomir Chakalov". In 2003, he was chosen to represent Bulgaria in the prestigious six-week summer school of the Massachusetts Institute of Technology – Research Science Institute (RSI). In 2005 he won a silver medal in the International Mathematics Olympiad, representing Bulgaria.
Dimitrov received BSc from Harvard University in 2010 with a thesis under the supervision of Barry Mazur. He earned a PhD from Yale University in 2017 under the supervision of Alexander Goncharov. His thesis is titled "Diophantine approximations by special points and applications to Dynamics and Geometry".
Research
In 2019 Dimitrov proved Schinzel-Zassenhaus conjecture on algebraic units which are not roots of unity.
Together with Ziyang Gao and Philipp Habegger he authored "Uniformity in Mordell-Lang for curves" (published in Annals of Mathematics, 2021). In this paper they obtain a uniform version of Mordell conjecture (proved by Gerd Faltings).
In collaboration with Frank Calegari and Yunqing Tang, Dimitrov proved the unbounded denominators conjecture of A.O.L. Atkin and Swinnerton-Dyer: if a modular form f(τ) is not modular for some congruence subgroup of the modular group, then the Fourier coefficients of f(τ) have unbounded denominators.
Also in collaboration with Calegari and Tang, Dimitrov developed a method which they employed to prove the linear independence over of various sets of numbers, most notably of and . Before their work it was not even known whether is irrational.
Awards
In 2022 he was awarded the David Goss Prize in Number Theory (shared with Ziyang Gao) and the Oberwolfach Prize (Algebra and number theory)
In 2023 he was awarded IMI Mathematics Prize (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences)
In 2025 he was awarded the Salem Prize "for fundamental contributions to Diophantine geometry and number theory".
In October 2025, he was named a recipient of the 2026 Frank Nelson Cole Prize in Number Theory, jointly with Frank Calegary and Tang, for their paper "The unbounded denominators conjecture", (JAMS,2025).
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