Connections between Minkowski and Cosmological Correlation Functions

Understand

We show how cosmological correlation functions of massless fields can be rewritten in terms of Minkowski correlation functions, by extracting symmetry-breaking operators from the cosmological correlators.

• This technique simplifies some cosmological calculations.
• Also, known properties of Minkowski correlation functions can be translated to non-trivial properties of cosmological correlations.
• To illustrate this idea, inflation to Minkowski and matter bounce to Minkowski relations are presented for the interactions of general single field inflation.