• the density contrast described by a nonlinear evolution equation either grows as dust or undergoes damped oscillations depending on the initial conditions
Evolution of the density
contrast in the spherical
model from aeq = 3 · 10-4 for the comoving wavelength 1/k = 0.34 Mpc, δk (aeq
) =0.004 (solid)
δk (aeq
) =0.005 (dashed).
N. B., R.J. Lindebaum, G.B. Tupper, and R.D. Viollier, JCAP 11 (2004)