H. David Politzer

Asymptotic freedom is the phenomenon where the strong force between quarks becomes weaker as they get closer together, meaning quarks behave almost as free particles at extremely high energies or short distances. Politzer discovered this property in 1973, independently and simultaneously with David Gross and Frank Wilczek, establishing it as a cornerstone of quantum chromodynamics (QCD).

Politzer shared the 2004 Nobel Prize in Physics with David Gross and Frank Wilczek, all recognized for their 1973 discovery of asymptotic freedom in the theory of the strong interaction. Gross and Wilczek were collaborating at Princeton, while Politzer was a graduate student at Harvard working independently when he arrived at the same result.

H. David Politzer is a professor of theoretical physics at the California Institute of Technology (Caltech), where he has been on the faculty since 1975. He has spent the vast majority of his academic career at Caltech following his graduate work at Harvard under Sidney Coleman.

Asymptotic freedom confirmed quantum chromodynamics as the correct description of the strong nuclear force, one of the four fundamental forces of nature. It explained why quarks cannot be observed in isolation (confinement) and provided the theoretical foundation that made possible later discoveries at particle accelerators such as the Large Hadron Collider at CERN.