New constraints on the observable inflaton potential from WMAP and SDSS

摘要: We derive some new constraints on single-field inflation from the Wilkinson Microwave Anisotropy Probe 3-year data combined with Sloan Luminous Red Galaxy survey. Our work differs previous analyses by focusing only observable part of inflaton potential, or in other words, making absolutely no assumption about extrapolation potential its region to minimum (i.e., branch responsible for last {approx}50 inflationary e-folds). assume that starts at least a few e-folds before Universe leaves Hubble radius, and rolls down monotonic regular sharp features phase transitions. Taylor-expand order v=2, 3 4 vicinity pivot scale, compute primordial spectra scalar tensor perturbations numerically fit data. For v>2, large fraction allowed models is found produce negative running tilt, fall parameter space where second-order slow-roll formalism strongly inaccurate. release code computation which compatible cosmomc.