Daniel Z. Freedman is a theoretical physicist whose work includes supergravity and the stability of fields in Anti-de Sitter spacetime. With Peter Breitenlohner, he derived the condition known as the Breitenlohner-Freedman bound.
Under the appropriate boundary conditions, a scalar field in Anti-de Sitter spacetime can be stable even when its mass-squared parameter is negative, provided it remains above the bound. Curved background geometry changes the stability criterion familiar from flat spacetime.[ref]
Stability in gauged extended supergravity by Peter Breitenlohner and Daniel Z. Freedman. 1982, scalar-field stability result
His MIT profile also identifies his 1976 collaborative construction of supergravity.[ref] Articles by others on the same topic
Daniel Z. Freedman is a notable figure in the field of physics, particularly known for his contributions to theoretical physics and, more specifically, quantum field theory and particle physics. He has authored or co-authored numerous scientific papers and works, often collaborating with other prominent physicists.