Galaxy Cluster Gas Mass Fraction and Hubble Parameter versus Redshift Constraints on Dark Energy
Lado Samushia, Gang Chen, Bharat Ratra
TL;DR
This paper combines galaxy cluster gas mass fraction and Hubble parameter data across redshifts to constrain dark energy models, finding support for the cosmological constant but allowing for slowly-evolving dark energy.
Contribution
It introduces a joint analysis method using multiple redshift datasets to improve constraints on dark energy models.
Findings
Data favor the Einstein cosmological constant model.
Slowly-evolving dark energy models are not ruled out.
Constraints are consistent with previous cosmological observations.
Abstract
Galaxy cluster gas mass fraction versus redshift data and Hubble parameter versus redshift data are used to jointly constrain dark energy models. These constraints favor the Einstein cosmological constant limit of dark energy but do not strongly rule out slowly-evolving dark energy.
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Taxonomy
TopicsCosmology and Gravitation Theories · Stellar, planetary, and galactic studies · Galaxies: Formation, Evolution, Phenomena