Dark sirens

• Grant number: 23/04813-8
• Support Opportunities: Regular Research Grants
• Start date: February 01, 2025
• End date: January 31, 2028
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Riccardo Sturani
• Grantee: Riccardo Sturani
• Host Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil
• Associated researchers: Valerio Marra
• Associated research grant: 22/06350-2 - Fundamental physics and LIGO, AP.ESP

Abstract

Gravitational wave (GW) astronomy is emerging rapidly as a young, yetmature science, which will providehundreds (tens of thousand) detection of binary mergers via second (third)generation observatories, the latter being operational in the next decade.It is then natural to investigate the new lines of researchthat are made possible by folding the gravitational information into the one obtainedby traditional electromagnetic observatories.In particular, in view of cosmological applications, coalescing binariesrepresent standard sirens, which can be used to constrain the cosmicexpansion history of the Universe.Data collected so far point to a ratio ofbright to dark (i.e. with vs. without electromagnetic counterparts) of roughly one toone hundred, motivating the cross correlation of gravitational informationwith galaxy catalogues to identify the host galaxy of dark GW events,thus allowing the redshift source determination, unavailable from GW data alone.Moreover, another class of observations which can also constrain the cosmicexpansion history is represented by measuring the impact of dark energyon growth rate of large scale structure.This project aims at exploring the combination of different probes-- dark standard sirens and galaxy catalogs with LSST -- to give the bestmeasurements of the cosmological expansion history. (AU)