Deriving a general expression for the bispectrum in cosmologies rules out most bouncing models
Top panel: The bouncing bispectrum computed with the numerical transfer functions (blue dots), fit to the bispectrum obtained in [23] (cyan) and the local bispectrum (yellow), for q = −0.7 (multiplication by fNL included). The bispectrum is plotted as a function of the product L ≡ l1l2l3, which allows plotting all values of the 3D bispectrum in a 2D plot, at the price of having multiple (l1, l2,l3) configurations corresponding to the same value of the product L. Bottom panel : The same bispectrum for l1 = 2 fixed as…
