Petr Hořava (born 1963 in Prostějov)[1] is a Czech string theorist.
Hořava is a member of the theory group at Lawrence Berkeley National Laboratory.
Hořava is known for his articles written with Edward Witten about the Hořava–Witten domain walls in M-theory.
string theory could be produced from 11-dimensional M-theory by making one of the dimensions have edges (the domain walls).
Hořava is less well known for his discovery of D-branes, usually attributed to Jin Dai, Robert Leigh and Joseph Polchinski, who discovered them independently, also in 1989.