The development of gravitational instabilities - RESCEU

‣ A lot is known at tree order
The tree order bispectra
B δ (k 1 , k 2 , k 2 ) = 〈δ (1) (k 1 )δ (1) (k 2 )δ (2) (k 3 )〉 + sym. = F (s)
2 (k 1, k 2 ) P (k 1 ) P (k 2 ) + sym.
Comparisons of poly-spectra (collapsed
geometry) with N-body simulations...
... and in observations
From FB ‘94
k 1 ≈ 0.3h/Mpc
k 1 ≈ 2k 2
From PSCz catalogue, Feldman et al. ‘01
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Francis Bernardeau IPhT Saclay