26-30 July 2021
Zoom
Europe/Berlin timezone

Cosmology in the dark: How compact binaries formation impact the gravitational-waves cosmological measurements

28 Jul 2021, 10:50
20m
Zoom

Zoom

Parallel session talk Astroparticle and Gravitational Waves T01: Astroparticle and Gravitational Waves

Speaker

Simone Mastrogiovanni (Astroparticule et Cosmologie Laboratoire, Universite de paris)

Description

Information about the mass spectrum of compact stars can be used to infer cosmological parameters from gravitational waves (GW) in the absence of redshift measurements obtained from electromagnetic (EM) observations. This method will be fundamental in measuring and testing cosmology with GWs for current and future ground-based GW detectors where the majority part of sources are detected without an associated EM counterpart.
In this talk, I will discuss the prospects and limitations of this approach for studying cosmology. I will show that, even when assuming GW detectors with current sensitivities, the determination of the Hubble constant is strongly degenerate with the maximum mass for black hole production.
I will discuss how assuming wrong models for the underlying population of black hole events can bias the Hubble constant estimate up to 40\%. I will then show how, when taking into account uncertainties on the population of black holes, it is possible to constrain the Hubble constant to a 10% accuracy and the maximum mass of black hole production to a value of 5% by combining 1000 GW event without and observed EM counterpart.

First author Simone Mastrogiovanni
Collaboration / Activity Postdoc
Email mastrosi@apc.in2p3.fr

Primary author

Simone Mastrogiovanni (Astroparticule et Cosmologie Laboratoire, Universite de paris)

Presentation Materials