201 citations · 1.8k across the 54 of their papers we have counts for
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astro-ph.CO2012★ 29 cited
Zel'dovich approximation and General Relativity
Cornelius Rampf, Gerasimos Rigopoulos
We show how the Zel'dovich approximation and the second order displacement field of Lagrangian perturbation theory can be obtained from a general relativistic gradient expansion in…
astro-ph.CO2012★ 9 cited
A non-linear approximation for perturbations in ΛCDM
Gerasimos Rigopoulos, Wessel Valkenburg
We describe inhomogeneities in a ΛCDM universe with a gradient series expansion and show that it describes the gravitational evolution far into the non-linear regime and beyond the…