Galaxy cluster angular size data constraints on dark energy

TL;DR

This study uses galaxy cluster angular size data to constrain dark energy models, finding compatibility with other data but limited restrictiveness, and supports a flat universe dominated by a cosmological constant.

Contribution

It applies angular size versus redshift data to constrain both constant and evolving dark energy models, providing a complementary analysis to existing cosmological probes.

Findings

Constraints are compatible with other data but not highly restrictive.

Supports a flat universe with a cosmological constant.

Cannot exclude time-varying dark energy models.

Abstract

We use angular size versus redshift data for galaxy clusters from Bonamente et al. (2006) to place constraints on model parameters of constant and time-evolving dark energy cosmological models. These constraints are compatible with those from other recent data, but are not very restrictive. A joint analysis of the angular size data with more restrictive baryon acoustic oscillation peak length scale and supernova Type Ia apparent magnitude data favors a spatially-flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude time-varying dark energy.