Yakov Sinai contributed to the study of Feigenbaum constants through thermodynamic formalism, in joint work with E. B. Vul and Konstantin Khanin. Their 1984 paper connects universal period-doubling scaling with methods of statistical mechanics, illustrating how probabilistic and geometric descriptions of a dynamical system can reinforce each other.[ref]
Feigenbaum universality and the thermodynamic formalism by E. B. Vul and others. Byline and article subject, Russian Mathematical Surveys 39(3), 1–40
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Yakov Sinai is a prominent Russian-born mathematician known for his contributions to the fields of dynamical systems, ergodic theory, mathematical physics, and probability theory. Born on September 21, 1935, Sinai has made significant advancements in understanding chaotic systems and has been instrumental in the development of modern mathematical concepts in these areas.