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added Green+(2004) transfer function cut-off for small-scale CDM

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Oliver Hahn 2014-01-28 16:42:24 +01:00
parent 3d47491989
commit ed3fb54aae
2 changed files with 58 additions and 2 deletions
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54
plugins/transfer_eisenstein.cc
View file

@ -316,10 +316,64 @@ public:
};
// CDM Bino type WIMP small-scale damped spectrum from Green, Hofmann & Schwarz (2004)
class transfer_eisenstein_cdmbino_plugin : public transfer_function_plugin
{
protected:
real_t m_h0;
double omegam_, H0_, omegab_, mcdm_, Tkd_, kfs_, kd_;
eisenstein_transfer etf_;
public:
transfer_eisenstein_cdmbino_plugin( config_file &cf )
: transfer_function_plugin(cf), m_h0( cosmo_.H0*0.01 )
{
double Tcmb = pcf_->getValueSafe("cosmology","Tcmb",2.726);
etf_.set_parameters( cosmo_, Tcmb );
omegam_ = cf.getValue<double>("cosmology","Omega_m");
omegab_ = cf.getValue<double>("cosmology","Omega_b");
H0_ = cf.getValue<double>("cosmology","H0");
mcdm_ = cf.getValueSafe<double>("cosmology","CDM_mass", 100.0); // bino particle mass in GeV
Tkd_ = cf.getValueSafe<double>("cosmology","CDM_Tkd", 33.0); // temperature at which CDM particle kinetically decouples (in MeV)
kfs_ = 1.7e6 / m_h0 * sqrt( mcdm_ / 100. * Tkd_ / 30. ) / (1.0 + log( Tkd_ / 30. ) / 19.2 );
kd_ = 3.8e7 / m_h0 * sqrt( mcdm_ / 100. * Tkd_ / 30. );
LOGINFO(" bino CDM: k_fs = %g, k_d = %g", kfs_, kd_ );
}
inline double compute( double k, tf_type type )
{
double kkfs = k/kfs_;
double kkfs2 = kkfs*kkfs;
double kkd2 = (k/kd_)*(k/kd_);
// in principle the Green et al. (2004) works only up to k/k_fs < 1
// the fit crosses zero at (k/k_fs)**2 = 3/2, we just zero it there...
if( kkfs2 < 1.5 )
return etf_.at_k( k ) * (1.0-2.0/3.0*kkfs2) * exp( -kkfs2 - kkd2 );
else
return 0.0;
}
inline double get_kmin( void ){
return 1e-4;
}
inline double get_kmax( void ){
return 1.e8;
}
};
namespace{
transfer_function_plugin_creator_concrete< transfer_eisenstein_plugin > creator("eisenstein");
transfer_function_plugin_creator_concrete< transfer_eisenstein_wdm_plugin > creator2("eisenstein_wdm");
transfer_function_plugin_creator_concrete< transfer_eisenstein_cdmbino_plugin > creator3("eisenstein_cdmbino");
}

6
transfer_function.hh
View file

@ -160,9 +160,11 @@ public:
if( type == cdm || type == baryon || type == total )
{
std::ofstream ofs(fname.c_str());
double kmin=-3, kmax=3, dk=(kmax-kmin)/100.;
double kmin=log10(tf->get_kmin()), kmax= log10(tf->get_kmax());
for( int i=0; i<100; ++i )
double dk=(kmax-kmin)/300.;
for( int i=0; i<300; ++i )
{
double k = pow(10.0,kmin+i*dk);
ofs << std::setw(16) << k