diff --git a/src/physical_constants_cgs.h b/src/physical_constants_cgs.h index 4d1a54f68ba557c74fb489a9343eaf3846c481f4..e0a9445d661a42f5f13e71cd97dd05230f35d5ac 100644 --- a/src/physical_constants_cgs.h +++ b/src/physical_constants_cgs.h @@ -36,6 +36,8 @@ * Phys. C, 40, 100001 (2016) and 2017 update. * http://pdg.lbl.gov/2017/reviews/rpp2017-rev-phys-constants.pdf * http://pdg.lbl.gov/2017/reviews/rpp2017-rev-astrophysical-constants.pdf + * + * The primordial Helium fraction is the value obtained by WMAP7. */ /*! Newton's gravitation constant [g^-1 cm^3 s^-2] */ @@ -95,8 +97,8 @@ const double const_earth_mass_cgs = 5.9724e27; /*! Temperature of the CMB at present day [K] */ const double const_T_CMB_0_cgs = 2.7255; -/*! Primordial Helium fraction [-] */ -const double const_primordial_He_fraction_cgs = 0.245; +/*! Primordial Helium fraction (from WMAP7) [-] */ +const double const_primordial_He_fraction_cgs = 0.248; /*! Reduced Hubble constant units (i.e. H_0 / h == 100 km / s / Mpc in CGS) * [s^-1] */