What CMB non-Gaussianity tells us about Effective Field Theories of Inflation

Donough Regan


The Lagrangian of the effective field theory of single field inflation has only a finite number of operators, with each giving a specific bispectrum shape. Decomposing into partial waves, a likelihood function is constructed. This is then used to constrain up to four linearly independent combinations of the coefficients. A Bayesian comparison test is carried out with results suggesting that models with two or more free parameters are disfavoured by the data.