<< Cosmo.WebHome %TOC% ---- ---+ ToK Warszawa meeting - Rough Notes Thu 16 Feb 2007 %RED% *These are just rough notes - feel free to correct them, add links, etc.* %ENDCOLOR% ---++ Langlois - Non-linear cosmological perturbations David Langlois + Vernizzi AstroPh:0503416 Evolution of non-linear cosmological perturbations AstroPh:0509078 Conserved non-linear quantities in cosmology ---+++ zeta contours of constant density are not equal to contours of constant time %$ -\zeta = \psi + \frac{H}{\dot{\rho}} \delta \rho $% ---+++ Evolution equation linear case: perfect fluid large scales - %$ k \ll aH $% - adiabatic %$\Rightarrow \zeta $% conserved ---+++ covariant approach generalised H parameter circle{H} = \Del_a u^a Hawking; Ellis & Bruni h_a^b \Del_a \rho = 0 FLRW \not= 0 perturbed FLRW
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