Observational Probes of Dark Energy

TL;DR

This paper reviews observational methods, focusing on Type Ia supernovae and galaxy clustering, to investigate the nature of dark energy responsible for the universe's accelerated expansion.

Contribution

It discusses recent observational results and future prospects for probing dark energy through cosmic expansion and structure growth measurements.

Findings

Type Ia supernovae provide key insights into cosmic acceleration.

Galaxy clustering measurements help distinguish dark energy models.

Recent results constrain dark energy properties.

Abstract

The cause for the observed acceleration in the expansion of the universe is unknown, and referred to as "dark energy" for convenience. Dark energy could be an unknown energy component, or a modification of Einstein's general relativity. This dictates the measurements that are optimal in unveiling the nature of dark energy: the cosmic expansion history, and the growth history of cosmic large scale structure. I will examine Type Ia supernovae and galaxy clustering as dark energy probes, and discuss recent results and future prospects.