BOSS

Compute the likelihood of supplied fsigma8(z=0.57), H(z=0.57), D_a(z=0.57), omegamh2, bsigma8(z=0.57)

File

likelihood/boss/boss_rsd.py

Attribution

SDSS-III BOSS Team

URL

http://www.sdss3.org

Citations

http://arxiv.org/abs/1303.4486

This module calculates the likelihood using the CMASS only results from Chuang et al. 2013 for fsigma8(z=0.57), H(z=0.57), D_a(z=0.57), omegamh2, bsigma8(z=0.57). There are two modes: mode=0 give the fsigma8(z=0.57) likelihood only; mode=1 give the more general BOSS likelihood.

Assumptions

  • SDSS-III CMASS DR9 dataset

  • When using mode = 1 CAMB must be run to output distance parameters and sigma8

  • The transfer function must be scale-independent to use this simple formulation: no MG, massive nu, for example.

Setup Parameters

Name

Type

Default

Description

mode

int

0

Mode=0 for a f*sigma8 likelihood only. mode=1 uses the full results, a likelihood of H(z), D_A(z), ommh2, b * sigma_8, f * sigma_8]

feedback

int

Amount of output to print. 0 for no feedback. 1 for basic (default = 0)

mean

real

0.428

Mean of f * sigma8

sigma

real

0.066

Error bar on f * sigma8

redshift

real

0.57

Redshift if measurement

Input values

Section

Name

Type

Default

Description

growth_parameters

d_z

real 1d

Linear growth factor D(z)

f_z

real 1d

Linear growth rate f(z)

z

real 1d

Redshift of samples

cosmological_parameters

omega_m

real

Baryon + CDM density fraction today

sigma_8

real

Amplitude of linear matter power at 8/h Mpc at z=0

bias

real

Galaxy bias

h0

real

Hubble parameter H0/(100 km/s/Mpc)

distances

z

real 1d

Redshifts of samples

d_a

real 1d

Angular diameter distance in Mpc

h

real 1d

Hubble parameter with in units of Mpc

Output values

Output values

Section

Name

Type

Description

likelihoods

BOSS_LIKE

real

Likelihood of supplied fsigma8(z=0.57), H(z=0.57), D_a(z=0.57), omegamh2, bsigma8(z=0.57)