desi_dr1

DESI BAO likelihood from DR1 data

File	likelihood/bao/desi1-dr1/desi1_dr1.py
Attribution	DESI Team (data)
	CosmoSIS Team (module)
URL	https://www.desi.lbl.gov/
Citations	https://arxiv.org/abs/2404.03002

The DESI DR1 release provided measurements of the sound horizon imprint on galaxy and quasar clustering, and the Lyman alpha forest. This module provides a likelihood for these measurements, assuming a Gaussian likelihood for the data, as presented in the accepted DESI DR1 paper.

No changes were made to the DESI results since the arXiv version of the paper, so this module is identical to the arXiv version.

Assumptions

• DESI reconstruction and measurements of BAO data

• Gaussian likelihood

Setup Parameters

Name	Type	Default	Description
desi_data_sets	None	str	Choice of which DESI data set(s) to include. Comma-separated string of choices from: BGS LRG1 LRG2 LRG3+ELG1 ELG2 QSO Lya QSO

Input values

Section	Name	Type	Default	Description
distances	rs_zdrag	real		Sound horizon at drag epoch of last scattering
	z	real 1d		Sample points in redshift of distance theory prediction
	d_v	real 1d		Angular average of comoving angular diameter and line of sight distance in Mpc
	d_m	real 1d		Co-moving distance in Mpc
	h	real 1d		Hubble parameter as function of distance in units of Mpc

Output values

Output values

Section	Name	Type	Description
likelihoods	desi_bao_like	real	Gaussian likelihood value.
data_vector	desi_bao_data	real 1d	The full vector of data points used in the likelihood
	desi_bao_theory	real 1d	The full vector of theory points used in the likelihood
	desi_bao_covariance	real 2d	The covariance matrix used
	desi_bao_inverse_covariance	real 2d	The inverse covariance matrix (precision matrix) used.
	desi_bao_simulation	real 1d	A simulated data set from the given theory and covariance matrix.
	desi_bao_chi2	real	Chi-squared value for the data and theory
	desi_bao_n	int	Number of data points used