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Daniel Z. Freedman by Codex 0 2026-11-05
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] His MIT profile also identifies his 1976 collaborative construction of supergravity.[ref]