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Studying strong phase transitions in neutron stars with gravitational waves
Katerina Chatziioannou, Sophia Han
The composition of neutron stars at the extreme densities reached in their cores is currently unknown. Besides nuclear matter of normal neutrons and protons, the cores of neutron s…
Including higher order multipoles in gravitational-wave models for precessing binary black holes
Sebastian Khan, Frank Ohme, Katerina Chatziioannou +1
Estimates of the source parameters of gravitational-wave (GW) events produced by compact binary mergers rely on theoretical models for the GW signal. We present the first frequency…
A guide to LIGO-Virgo detector noise and extraction of transient gravitational-wave signals
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1135
The LIGO Scientific Collaboration and the Virgo Collaboration have cataloged eleven confidently detected gravitational-wave events during the first two observing runs of the advanc…
Model comparison from LIGO-Virgo data on GW170817's binary components and consequences for the merger remnant
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1191
GW170817 is the very first observation of gravitational waves originating from the coalescence of two compact objects in the mass range of neutron stars, accompanied by electromagn…
Noise spectral estimation methods and their impact on gravitational wave measurement of compact binary mergers
Katerina Chatziioannou, Carl-Johan Haster, Tyson B. Littenberg +5
Estimating the parameters of gravitational wave signals detected by ground-based detectors requires an understanding of the properties of the detectors' noise. In particular, the m…
A morphology-independent search for gravitational wave echoes in data from the first and second observing runs of Advanced LIGO and Advanced Virgo
Ka Wa Tsang, Archisman Ghosh, Anuradha Samajdar +4
Gravitational wave echoes have been proposed as a smoking-gun signature of exotic compact objects with near-horizon structure. Recently there have been observational claims that ec…
Search for sub-solar mass ultracompact binaries in Advanced LIGO's second observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1187
We present an Advanced LIGO and Advanced Virgo search for sub-solar mass ultracompact objects in data obtained during Advanced LIGO's second observing run. In contrast to a previou…
Summary of Tests of General Relativity with the Binary Black Hole Signals from the LIGO-Virgo Catalog GWTC-1
Nathan K. Johnson-McDaniel
We summarize the four tests of general relativity carried out using the ten binary black hole signals detected by Advanced LIGO and Advanced Virgo and included in their first catal…
Equation-of-state Constraints and the QCD Phase Transition in the Era of Gravitational-Wave Astronomy
Andreas Bauswein, Niels-Uwe Friedrich Bastian, David Blaschke +7
We describe a multi-messenger interpretation of GW170817, which yields a robust lower limit on NS radii. This excludes NSs with radii smaller than about 10.7 km and thus rules out…
Hierarchical test of general relativity with gravitational waves
Maximiliano Isi, Katerina Chatziioannou, Will M. Farr
We propose a hierarchical approach to testing general relativity with multiple gravitational wave detections. Unlike existing strategies, our method does not assume that parameters…
The SXS Collaboration catalog of binary black hole simulations
Michael Boyle, Daniel Hemberger, Dante A. B. Iozzo +37
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximum science. Near the tim…
On combining information from multiple gravitational wave sources
Aaron Zimmerman, Carl-Johan Haster, Katerina Chatziioannou
In the coming years, advanced gravitational wave detectors will observe signals from a large number of compact binary coalescences. The majority of these signals will be relatively…
Distinguishing binary neutron star from neutron star-black hole mergers with gravitational waves
Hsin-Yu Chen, Katerina Chatziioannou
The gravitational-wave signal from the merger of two neutron stars cannot be easily differentiated from the signal produced by a comparable-mass mixed binary of a neutron star and…
Extreme Gravity and Fundamental Physics
B. S. Sathyaprakash, Alessandra Buonanno, Luis Lehner +26
Future gravitational-wave observations will enable unprecedented and unique science in extreme gravity and fundamental physics answering questions about the nature of dynamical spa…
On the properties of the massive binary black hole merger GW170729
Katerina Chatziioannou, Roberto Cotesta, Sudarshan Ghonge +53
We present a detailed investigation into the properties of GW170729, the gravitational wave with the most massive and distant source confirmed to date. We employ an extensive set o…
Tests of General Relativity with the Binary Black Hole Signals from the LIGO-Virgo Catalog GWTC-1
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1142
The detection of gravitational waves by Advanced LIGO and Advanced Virgo provides an opportunity to test general relativity in a regime that is inaccessible to traditional astronom…
Equation-of-state insensitive relations after GW170817
Zack Carson, Katerina Chatziioannou, Carl-Johan Haster +2
The thermodynamic relation between pressure and density (i.e. the equation of state) of cold supranuclear matter is critical in describing neutron stars, yet it remains one of the…
Low-Latency Gravitational Wave Alerts for Multi-Messenger Astronomy During the Second Advanced LIGO and Virgo Observing Run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1135
Advanced LIGO's second observing run (O2), conducted from November 30, 2016 to August 25, 2017, combined with Advanced Virgo's first observations in August 2017 witnessed the birth…