The Ludwig Boltzmann Prize is awarded by the Austrian Physical Society and honors outstanding achievements in theoretical physics. It is named after the famous Austrian physicist Ludwig Boltzmann. The prize was established at the annual meeting of the Austrian Physical Society in Innsbruck in 1953. It is awarded every other year, alternating with the Fritz Kohlrausch Prize for experimental physics, to an outstanding theoretical physicist who is usually not older than 35 years. Currently (2011) the prize money is 2500 Euro. Source: Wikipedia (en)