Juan Maldacena calculated three-point correlations of primordial scalar and tensor fluctuations in single-field cosmic inflation. His 2003 analysis gave explicit leading slow-roll predictions for primordial non-Gaussianity and showed that certain squeezed limits are fixed by the scale dependence of the two-point spectrum.[ref]
Non-Gaussian features of primordial fluctuations in single field inflationary models by Juan Maldacena. Abstract and section 4: three-point functions and long-wavelength limits
A squeezed bispectrum configuration compares one long wavelength with two short ones. In the applicable single-field regime, the long fluctuation acts locally as a coordinate rescaling, producing the single-field inflation squeezed-limit consistency relation. The statement depends on the inflationary model and limiting assumptions, rather than applying to every primordial three-point function.
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Juan Maldacena is an Argentine theoretical physicist renowned for his significant contributions to string theory and quantum gravity. He is perhaps best known for formulating the Maldacena duality, also known as the AdS/CFT correspondence, in 1997. This groundbreaking theoretical result posits a relationship between a type of string theory defined in a higher-dimensional space (Anti-de Sitter space) and a conformal field theory defined on the boundary of that space.