Formulae for Growth Factors In Expanding Universes Containing Matter and a Cosmological Constant

Abstract

Formulae are presented for the linear growth factor D/a and its logarithmic derivative dlnD/dlna in expanding Friedmann-Robertson-Walker Universes with arbitrary matter and vacuum densities. The formulae permit rapid and stable numerical evaluation. A fortran program is available at http://casa.colorado.edu/~ajsh/growl/ .

7 pages, including 3 embedded PostScript figures. Minor changes to agree with version accepted for publication in MNRAS. Fortran package growl.tar.gz available at http://casa.colorado.edu/~ajsh/growl/

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