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Package cosmolopy :: Module parameters

Module parameters

source code

Some pre-defined sets of cosmological parameters (e.g. from WMAP).
Functions
 
add_extras(cosmo)
Sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24. Also sets w = -1.		 source code
 
WMAP7_BAO_H0_mean(flat=False, extras=True)
WMAP7 + BAO + H_0 parameters from Komatsu et al. (arxiv:1001.4538v1)		 source code
 
WMAP7_ML(flat=False, extras=True)
WMAP7 ML parameters from Komatsu et al. (arxiv:1001.4538v1)		 source code
 
WMAP5_BAO_SN_mean(flat=False, extras=True)
WMAP5 + BAO + SN parameters from Komatsu et al. (2009ApJS..180..330K).		 source code
 
WMAP5_ML(flat=False, extras=True)
WMAP5 parameters (using WMAP data alone) from Komatsu et al. (2009ApJS..180..330K).		 source code
 
WMAP5_mean(flat=False, extras=True)
WMAP5 parameters (using WMAP data alone) from Komatsu et al. (2009ApJS..180..330K).		 source code
 
WiggleZ_fiducial(extras=True)
WiggleZ fiducial cosmological parameter set from Blake et al. (arxiv:1105.2862). N.b. that this does not use any WiggleZ results.		 source code
Variables
  __package__ = None
Function Details

WMAP7_BAO_H0_mean(flat=False, extras=True)

source code 

WMAP7 + BAO + H_0 parameters from Komatsu et al. (arxiv:1001.4538v1)

Parameters

flat: boolean

If True, sets omega_lambda_0 = 1 - omega_M_0 to ensure omega_k_0 = 0 exactly. Also sets omega_k_0 = 0 explicitly.

extras: boolean

If True, sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24.

WMAP7_ML(flat=False, extras=True)

source code 

WMAP7 ML parameters from Komatsu et al. (arxiv:1001.4538v1)

Parameters

flat: boolean

If True, sets omega_lambda_0 = 1 - omega_M_0 to ensure omega_k_0 = 0 exactly. Also sets omega_k_0 = 0 explicitly.

extras: boolean

If True, sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24.

WMAP5_BAO_SN_mean(flat=False, extras=True)

source code 

WMAP5 + BAO + SN parameters from Komatsu et al. (2009ApJS..180..330K).

Parameters

flat: boolean

If True, sets omega_lambda_0 = 1 - omega_M_0 to ensure omega_k_0 = 0 exactly. Also sets omega_k_0 = 0 explicitly.

extras: boolean

If True, sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24.

Notes

From the abstract of the paper:

The six parameters and the corresponding 68% uncertainties, derived from the WMAP data combined with the distance measurements from the Type Ia supernovae (SN) and the Baryon Acoustic Oscillations (BAO) in the distribution of galaxies, are:

Omega_B h^2 = 0.02267+0.00058-0.00059, Omega_c h^2 = 0.1131 +/- 0.0034, Omega_Lambda = 0.726 +/- 0.015, n_s = 0.960 +/- 0.013, tau = 0.084 +/- 0.016, and Delata^2 R = (2.445 +/- 0.096) * 10^-9 at k = 0.002 Mpc^-1.

From these, we derive

sigma_8 = 0.812 +/- 0.026, H0 = 70.5 +/- 1.3 km s^-11 Mpc^-1, Omega_b = 0.0456 +/- 0.0015, Omega_c = 0.228 +/- 0.013, Omega_m h^2 = 0.1358 + 0.0037 - 0.0036, zreion = 10.9 +/- 1.4, and t0 = 13.72 +/- 0.12 Gyr.

WMAP5_ML(flat=False, extras=True)

source code 

WMAP5 parameters (using WMAP data alone) from Komatsu et al. (2009ApJS..180..330K).

Parameters

flat: boolean

If True, sets omega_lambda_0 = 1 - omega_M_0 to ensure omega_k_0 = 0 exactly. Also sets omega_k_0 = 0 explicitly.

extras: boolean

If True, sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24.

Notes

Values taken from "WMAP 5 Year ML" column of Table 1 of the paper.

WMAP5_mean(flat=False, extras=True)

source code 

WMAP5 parameters (using WMAP data alone) from Komatsu et al. (2009ApJS..180..330K).

Parameters

flat: boolean

If True, sets omega_lambda_0 = 1 - omega_M_0 to ensure omega_k_0 = 0 exactly. Also sets omega_k_0 = 0 explicitly.

extras: boolean

If True, sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24.

Notes

Values taken from "WMAP 5 Year Mean" of Table 1 of the paper.

WiggleZ_fiducial(extras=True)

source code 

WiggleZ fiducial cosmological parameter set from Blake et al. (arxiv:1105.2862). N.b. that this does not use any WiggleZ results.

Parameters

extras: boolean

If True, sets neutrino number N_nu = 0, neutrino density omega_n_0 = 0.0, Helium mass fraction Y_He = 0.24

Notes

Values taken from the final paragraph of Section 1 of the paper. The cosmology is flat by definition.


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