10.1. Overdensity \(\Delta(z)\) descriptions

Possible keyword choices for the gCOSMO_FLAG_DELTA_REF parameter.

Keyword Description
kRHO_CRIT \(\Delta(z) = \Delta_{\rm crit}\)
kRHO_MEAN \(\Delta(z) = \Delta_{\rm crit} \times \Omega_{\rm m}(z)\)
kBRYANNORMAN98 Using the formula by Bryan and Norman (1998) for a flat Universe


 

Note

\(\Delta_{\rm crit}\) is the constant overdensity factor set via the gCOSMO_DELTA0 input parameter. See also Section 6.7, Cosmology (cosmo.h).