Using Perturbative Least Action to Recover Cosmological Initial Conditions

Details Using Perturbative Least Action to Recover Cosmological Initial Conditions Using Perturbative Least Action to Recover Cosmological Initial Conditions

1999-12-19

arxiv.org/abs/astro-ph/9912408v2

Astrophys.J.544:21,2000

Astronomy and Astrophysics

Astrophysics

24 pages, 6 postscript figures. Accepted for publication in Astrophysical Journal

Scientific paper

10.1086/317182

We introduce a new method for generating initial conditions consistent with highly nonlinear observations of density and velocity fields. Using a variant of the Least Action method, called Perturbative Least Action (PLA), we show that it is possible to generate several different sets of initial conditions, each of which will satisfy a set of highly nonlinear observational constraints at the present day. We then discuss a code written to test and apply this method and present the results of several simulations.

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