Probing the Universe鈥檚 expansion with multi-messenger astronomy

Antonella Palmese (Carnegie Mellon University) 鈥� April 22, 2024

Abstract

Thanks to the synergies between gravitational wave (GW) experiments, such as LIGO/Virgo/KAGRA, and electromagnetic observations of transients and galaxies, a variety of novel cosmological measurements has recently become possible. Several of these measurements rely on the use of GW events as “standard sirens鈥�. Following the detection of the first electromagnetic counterpart to a GW event, GW170817, the first 鈥渂right鈥� standard siren measurement has been performed. We continue searching for optical counterparts to enable more bright siren analyses with the Gravitational Wave Multi-Messenger Astronomy DECam Survey (GW-MMADS), which I will introduce. Standard siren measurements for 鈥渄ark” events, i.e. without a confirmed electromagnetic counterpart, can also been performed, using cross-correlations with galaxy or Active Galactic Nuclei catalogs. In this talk I will present our latest bright and dark standard siren measurements, and also provide forecasts for multi-messenger cosmology in the upcoming years.

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