EFT of Inflation: Reflections on CMB and Forecasts on LSS Surveys

Abstract: We investigate the possibility of constraining parameters of Effective Field Theory (EFT) of inflation with upcoming Large Scale Structure (LSS) surveys in order to have a better understanding of inflationary dynamics. With the development of the construction algorithm of EFT, we arrive at a properly truncated action for the entire scenario. Using this, we compute the two-point correlation function for quantum fluctuations from Goldstone modes and related inflationary observables in terms of coefficients of relevant EFT operators. We then perform Fisher matrix forecast analysis to estimate the possible error bars on the parameters of EFT as well as on the inflationary parameters using two upcoming LSS surveys, namely, LSST and EUCLID.