From amplitudes to contact cosmological correlators

• DOI: 10.1007/jhep10(2021)001
• Publication Date: 2021-10-04T12:45:50Z
• Authors: James Bonifacio; Enrico Pajer; Dong-Gang Wang
• Keywords: Unitarity

A bstract Our understanding of quantum correlators in cosmological spacetimes, including those that we can observe surveys, has improved qualitatively the past few years. Now know many constraints these objects must satisfy as consequences general physical principles, such symmetries, unitarity and locality. Using this new understanding, derive most scalar four-point correlator, i.e., trispectrum, to all orders derivatives for manifestly local contact interactions. To obtain result use techniques from commutative algebra write down possible four-particle amplitudes without assuming invariance under Lorentz boosts. We then input into a reconstruction formula generates correlator de Sitter spacetime or graviton amplitude. also show how same procedure be used higher-point correlators. results further extend reach boostless bootstrap build connection between flat curved physics.