Chifan received the award alongside coauthors Adrian Ioana, Denis Osin, and Bin Sun for their paper, “Wreath-like Products of Groups and Their von Neumann Algebras I: W-Superrigidity,”* published in the Annals of Mathematics in 2023.

Established by the International Congress of Basic Science (ICBS) in 2023, the Frontiers of Science Award recognizes major original research papers published during the previous ten years across 40 fields in mathematics, physics, and information science. For the 2026 awards, more than 4,000 papers were nominated worldwide. Winning papers were selected through a rigorous review and voting process conducted by three independent international expert panels, with the overall scientific review chaired by Fields Medalist Shing-Tung Yau.

The 2026 award recipients were announced on May 18, 2026, at Tsinghua University in Beijing. Awards were formally presented on August 9 during the opening ceremony of the International Congress of Basic Science at the Beijing Yanqi Lake International Convention and Exhibition Center. Coauthor Bin Sun accepted the award on behalf of all four authors.

Professor Chifan has shared a brief summary of the impact:

"The main significance of the paper is that it provided the first progress on a major rigidity conjecture formulated more than 40 years ago, in 1982, by Fields Medalist Alain Connes. Connes conjectured, roughly speaking, that for groups with Kazhdan’s property (T), the associated von Neumann algebra should completely remember the group from which it was constructed. Until our work, no examples of property (T) groups for which this conjecture could be verified were known.

Our paper introduced a new class of groups, called wreath-like product groups, arising from ideas in geometric group theory and group-theoretic Dehn filling. We proved that a large family of these groups with property (T) are W*-superrigid, meaning that the group can be completely reconstructed, up to isomorphism, from its von Neumann algebra. In particular, the paper produced the first examples---and in fact a continuum of pairwise non-isomorphic examples---of property (T) groups satisfying Connes’ Rigidity Conjecture. This established the conjecture for a first, substantial class of groups and also highlighted a fruitful interaction between operator algebras and geometric group theory.”

For additional information, readers can view a short article about the awards and event, as well as the award-winning paper itself.

Congratulations to Professor Chifan and his collaborators on this outstanding achievement!