From fast radio bursts to a Pantheon of supernovae Transient sources in strong gravitational lensing

by Jenny Wagner

at Astrophysics and Cosmology Seminar

Wed, 19 Dec 2018, 11:10
Physics building (#54) room 207

Abstract

Currently there are only a few observations of transient background sources like quasars or supernovae that are mapped into multiple images by a strong gravitational lens Yet measuring the delay in the arrival time between these images is highly useful to reconstruct the mass distribution within the lens or to infer the Hubble constant I will present results for a simulated galaxy cluster gravitational lens that show the increase in the precision and in the accuracy of the reconstructed mass density distribution when time delay observations are taken into account In addition I will discuss the advantages and disadvantages of multiply imaged supernovae quasars gamma ray bursts and fast radio bursts as probes for the mass distribution Secondly I will introduce a cosmic distance measure that can be set up from the most recent Pantheon sample of supernovae It is purely data based and as such agnostic about the nature and amount of dark matter and dark energy in our universe Inserting this supernovae based cosmic distance measure into the gravitational lensing formalism I will show how to simplify the calculation of the Hubble constant from time delay measurements and make it independent of a specific Friedmann cosmological model

Created on 13-12-2018 by Bar Lev, Yevgeny (ybarlev)
Updaded on 13-12-2018 by Bar Lev, Yevgeny (ybarlev)