Leonid Keldysh
| Leonid Keldysh | |
|---|---|
| Леонид Келдыш | |
| Born | Leonid Veniaminovich Keldysh April 7, 1931 | 
| Died | November 11, 2016 (aged 85) Moscow, Russia | 
| Citizenship | Russian | 
| Known for | Keldysh formalism Franz–Keldysh effect | 
| Mother | Lyudmila Keldysh | 
| Relatives | Pyotr Novikov (step-father) Mstislav Keldysh (uncle) Sergei Novikov (step-brother) | 
| Awards | EPS Europhysics Prize (1975) Rusnanoprize (2009) Lomonosov Gold Medal (2015) | 
| Scientific career | |
| Fields | Theoretical physics | 
| Institutions | Lebedev Physical Institute | 
| Academic advisors | Vitaly Ginzburg | 
| Doctoral students | Yuri Kopaev | 
Leonid Veniaminovich Keldysh (Russian: Леонид Вениаминович Келдыш; 7 April 1931 – 11 November 2016) was a Soviet and Russian physicist. Keldysh was a professor in the I.E. Tamm Theory division of the Lebedev Physical Institute of the Russian Academy of Sciences in Moscow and a faculty member at Texas A&M University. He is known for developing the Keldysh formalism, a powerful quantum field theory framework designed to describe a system in a non-equilibrium state, as well as for the theory of excitonic insulators (Keldysh-Kopaev model, with Yuri Kopaev). Keldysh's awards include the 2009 Rusnanoprize, an international nanotechnology award, for his work related to molecular-beam epitaxy, the 2011 Evgenii Feinberg Memorial Medal, and the 2015 Lomonosov Grand Gold Medal of the Russian Academy of Sciences.
Keldysh was a son of mathematician Lyudmila Keldysh. His uncle, Mstislav Keldysh, was a mathematician and the president of the Academy of Sciences of the Soviet Union. Sergei Novikov, a mathematician and a Fields medalist, is his step-brother.