growth_lowz_bm.py

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import numpy as np
import matplotlib.pyplot as plt
import py_cosmo_mad as csm

TCMB=2.725
PLOT_STUFF=0
WRITE_STUFF=1
FS=16

def do_all(z_arr,cpar,prefix) :
    pcs=csm.PcsPar()
    pcs.background_set(cpar['om'],cpar['ol'],cpar['ob'],cpar['w0'],cpar['wa'],cpar['hh'],TCMB)

    a_arr=1./(z_arr+1)
    gf_arr=np.array([pcs.growth_factor(a) for a in a_arr])

    if PLOT_STUFF==1 :
        plt.plot(a_arr,gf_arr); plt.xlabel('$a$',fontsize=FS); plt.ylabel('$D(z)$',fontsize=FS); plt.show()

    if WRITE_STUFF==1 :
        np.savetxt(prefix+"_gf.txt",np.transpose([z_arr,gf_arr]),header="[1] z, [2] D(z)")

z_arr=np.array([0.,1.,2.,3.,4.,5.])

cpar_model1={'om': 0.3,'ol': 0.7 ,'ob':0.05,'hh': 0.7,'s8': 0.8,'ns': 0.96,'w0': -1.0, 'wa': 0.0}
cpar_model2={'om': 0.3,'ol': 0.7 ,'ob':0.05,'hh': 0.7,'s8': 0.8,'ns': 0.96,'w0': -0.9, 'wa': 0.0}
cpar_model3={'om': 0.3,'ol': 0.7 ,'ob':0.05,'hh': 0.7,'s8': 0.8,'ns': 0.96,'w0': -0.9, 'wa': 0.1}
cpar_model4={'om': 0.3,'ol': 0.75,'ob':0.05,'hh': 0.7,'s8': 0.8,'ns': 0.96,'w0': -0.9, 'wa': 0.1}
cpar_model5={'om': 0.3,'ol': 0.65,'ob':0.05,'hh': 0.7,'s8': 0.8,'ns': 0.96,'w0': -0.9, 'wa': 0.1}

do_all(z_arr,cpar_model1,"model1")
do_all(z_arr,cpar_model2,"model2")
do_all(z_arr,cpar_model3,"model3")
do_all(z_arr,cpar_model3,"model4")
do_all(z_arr,cpar_model3,"model5")