def test_class_setup():
cosmology = astropy.cosmology.Planck13
assert cosmology.Om0 == cosmology.Odm0 + cosmology.Ob0
assert 1 == (cosmology.Om0 + cosmology.Ode0 + cosmology.Ok0 +
cosmology.Ogamma0 + cosmology.Onu0)
class_parameters = get_class_parameters(cosmology)
try:
from classy import Class
cosmo = Class()
cosmo.set(class_parameters)
cosmo.compute()
assert cosmo.h() == cosmology.h
assert cosmo.T_cmb() == cosmology.Tcmb0.value
assert cosmo.Omega_b() == cosmology.Ob0
# Calculate Omega(CDM)_0 two ways:
assert abs((cosmo.Omega_m() - cosmo.Omega_b()) -
(cosmology.Odm0 - cosmology.Onu0)) < 1e-8
assert abs(cosmo.Omega_m() - (cosmology.Om0 - cosmology.Onu0)) < 1e-8
# CLASS calculates Omega_Lambda itself so this is a non-trivial test.
calculated_Ode0 = cosmo.get_current_derived_parameters(
['Omega_Lambda'])['Omega_Lambda']
assert abs(calculated_Ode0 - (cosmology.Ode0 + cosmology.Onu0)) < 1e-5
cosmo.struct_cleanup()
cosmo.empty()
except ImportError:
pass
M = Class()
M.set(common_settings)
M.set({'z_pk': z_rec})
M.compute()
#
# load transfer functions at recombination
#
one_time = M.get_transfer(z_rec)
print one_time.viewkeys()
k = one_time['k (h/Mpc)']
Theta0 = 0.25 * one_time['d_g']
phi = one_time['phi']
psi = one_time['psi']
theta_b = one_time['t_b']
# compute related quantitites
R = 3. / 4. * M.Omega_b() / M.Omega_g() / (
1 + z_rec) # R = 3/4 * (rho_b/rho_gamma) at z_rec
zero_point = -(1. + R) * psi # zero point of oscillations: -(1.+R)*psi
#
# get Theta0 oscillation amplitude (for vertical scale of plot)
#
Theta0_amp = max(Theta0.max(), -Theta0.min())
#
# use table of background quantitites to find the wavenumbers corresponding to
# Hubble crossing (k = 2 pi a H), sound horizon crossing (k = 2pi / rs)
#
background = M.get_background() # load background table
#print background.viewkeys()
#
background_tau = background[
'conf. time [Mpc]'] # read confromal times in background table
#
all_k = M.get_perturbations(
) # this potentially constains scalars/tensors and all k values
print all_k['scalar'][0].viewkeys()
#
one_k = all_k['scalar'][
0] # this contains only the scalar perturbations for the requested k values
#
tau = one_k['tau [Mpc]']
Theta0 = 0.25 * one_k['delta_g']
phi = one_k['phi']
psi = one_k['psi']
theta_b = one_k['theta_b']
a = one_k['a']
# compute related quantitites
R = 3. / 4. * M.Omega_b() / M.Omega_g() * a # R = 3/4 * (rho_b/rho_gamma)
zero_point = -(1. + R) * psi # zero point of oscillations: -(1.+R)*psi
#
# get Theta0 oscillation amplitude (for vertical scale of plot)
#
Theta0_amp = max(Theta0.max(), -Theta0.min())
#
# get the time of decoupling
#
quantities = M.get_current_derived_parameters(['tau_rec'])
# print times.viewkeys()
tau_rec = quantities['tau_rec']
#
# use table of background quantitites to find the time of
# Hubble crossing (k / (aH)= 2 pi), sound horizon crossing (k * rs = 2pi)
#
# save the total Cl's (we will plot them in the last step)
#
cl_tot = M.raw_cl(5000)
#
#
# load transfer functions at recombination
#
one_time = M.get_transfer(z_rec)
print (one_time.keys())
k = one_time['k (h/Mpc)']
Theta0 = 0.25*one_time['d_g']
phi = one_time['phi']
psi = one_time['psi']
theta_b = one_time['t_b']
# compute related quantitites
R = 3./4.*M.Omega_b()/M.Omega_g()/(1+z_rec) # R = 3/4 * (rho_b/rho_gamma) at z_rec
zero_point = -(1.+R)*psi # zero point of oscillations: -(1.+R)*psi
Theta0_amp = max(Theta0.max(),-Theta0.min()) # Theta0 oscillation amplitude (for vertical scale of plot)
print ('At z_rec: R=',R,', Theta0_amp=',Theta0_amp)
# In[ ]:
# use table of background quantitites to find the wavenumbers corresponding to
# Hubble crossing (k = 2 pi a H), sound horizon crossing (k = 2pi / rs)
#
background = M.get_background() # load background table
print (background.keys())
#
background_tau = background['conf. time [Mpc]'] # read confromal times in background table
