Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session H16: What we learned from GW170817 and what we'll learn from future events
10:45 AM–12:09 PM,
Sunday, April 14, 2019
Sheraton
Room: Grand Ballroom I
Sponsoring
Units:
DAP DGRAV
Chair: Duncan Brown, Syracuse University
Abstract: H16.00004 : Universal Relations after GW170817*
11:21 AM–11:33 AM
View Presentation Abstract
Presenter:
Zack Carson
(University of Virginia)
Authors:
Zack Carson
(University of Virginia)
Katerina Chatziioannou
(University of Toronto)
Carl-Johan O Haster
(University of Toronto)
Nicolas Yunes
(Montana State University, Bozeman)
Kent Yagi
(University of Virginia)
Collaboration:
Katerina Chatziioannou and Carl-Johan Haster: LIGO
the largest uncertainties in nuclear physics to date. The extraction of tidal deformabilities from the
gravitational waveforms of binary neutron star merger events, such as GW170817, is a promising
method of probing such nuclear structure. Previous studies have shown that approximately equation
of state insensitive relations exist between various neutron star observables. In particular, we study
the “I-Love-Q” and “binary Love” universal relations, which assist in reducing the uncertainty of
the dominant tidal effect in parameter estimation. In this talk, I will explain how one can reduce
equation of state variation for universal relations by restricting to only equations of state drawn
from the 90% posterior on pressure as a function of density, as derived by the LIGO Collaboration.
We find an improvement in binary Love universality by a factor of 59% for stars with mass ratio
0.75, and in I-Love-Q universality by 50%. I conclude by comparing systematic errors on tidal
measurement due to the equation of state variation with statistical errors and comment on whether
one can safely use these universal relations with future gravitational wave observations.
*NSF Award PHY-1806776
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