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The interplay of astrophysics and nuclear physics in determining the properties of neutron stars
Jacob Golomb, Isaac Legred, Katerina Chatziioannou +1
Neutron star properties depend on both nuclear physics and astrophysical processes, and thus observations of neutron stars offer constraints on both large-scale astrophysics and th…
Parameter control for eccentric, precessing binary black hole simulations with SpEC
Taylor Knapp, Katerina Chatziioannou, Harald Pfeiffer +2
Numerical relativity simulations of merging black holes provide the most accurate description of the binary dynamics and the emitted gravitational wave signal. However, practical c…
Compact binary coalescences: gravitational-wave astronomy with ground-based detectors
K. Chatziioannou, T. Dent, M. Fishbach +4
The era of gravitational wave astronomy began in 2015 with the observation of the signal from the merger of two black holes by the LIGO detectors; by 2021, almost 100 more such tra…
The anti-aligned spin of GW191109: glitch mitigation and its implications
Rhiannon Udall, Sophie Hourihane, Simona Miller +4
With a high total mass and an inferred effective spin anti-aligned with the orbital axis at the 99.9% level, GW191109 is one of the most promising candidates for a dynamical format…
Neutron stars and the dense matter equation of state: from microscopic theory to macroscopic observations
Katerina Chatziioannou, H. Thankful Cromartie, Stefano Gandolfi +4
The past years have witnessed tremendous progress in understanding the properties of neutron stars and of the dense matter in their cores, made possible by electromagnetic observat…
The NANOGrav 15 yr data set: Posterior predictive checks for gravitational-wave detection with pulsar timing arrays
Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald +99
Pulsar-timing-array experiments have reported evidence for a stochastic background of nanohertz gravitational waves consistent with the signal expected from a population of superma…
Nonlinear Alfvén-wave Dynamics and Premerger Emission from Crustal Oscillations in Neutron Star Mergers
Elias R. Most, Yoonsoo Kim, Katerina Chatziioannou +1
Neutron stars have solid crusts threaded by strong magnetic fields. Perturbations in the crust can excite non-radial oscillations, which can in turn launch Alfven waves into the ma…
PKS 2131-021 -- Discovery of Strong Coherent Sinusoidal Variations from Radio to Optical Frequencies: Compelling Evidence for a Blazar Supermassive Black Hole Binary
S. Kiehlmann, P. V. de la Parra, A. G. Sullivan +31
Haystack and Owens Valley Radio Observatory (OVRO) observations recently revealed strong, intermittent, sinusoidal total flux-density variations that maintained coherence between 1…
The curvature dependence of gravitational-wave tests of General Relativity
Ethan Payne, Maximiliano Isi, Katerina Chatziioannou +3
High-energy extensions to General Relativity modify the Einstein-Hilbert action with higher-order curvature corrections and theory-specific coupling constants. The order of these c…
Multidimensional hierarchical tests of general relativity with gravitational waves
Haowen Zhong, Maximiliano Isi, Katerina Chatziioannou +1
Tests of general relativity with gravitational waves typically introduce parameters for putative deviations and combine information from multiple events by characterizing the popul…
Gravitational-wave model for neutron star merger remnants with supervised learning
Theodoros Soultanis, Kiril Maltsev, Andreas Bauswein +3
We present a time-domain model for the gravitational waves emitted by equal-mass binary neutron star merger remnants for a fixed equation of state. We construct a large set of nume…
Observation of Gravitational Waves from the Coalescence of a Compact Object and a Neutron Star
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1793
We report the observation of a coalescing compact binary with component masses and (all measurements quoted at the 90% credible le…
Ultralight vector dark matter search using data from the KAGRA O3GK run
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1800
Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating l…
Background information: a study on the sensitivity of astrophysical gravitational-wave background searches
Arianna I. Renzini, Thomas A. Callister, Katerina Chatziioannou +1
The vast majority of gravitational-wave signals from stellar-mass compact binary mergers are too weak to be individually detected with present-day instruments and instead contribut…
Using Equation of State Constraints to Classify Low-Mass Compact Binary Mergers
Jacob Golomb, Isaac Legred, Katerina Chatziioannou +2
Compact objects observed via gravitational waves are classified as black holes or neutron stars primarily based on their inferred mass with respect to stellar evolution expectation…
Source Confusion from Neutron Star Binaries in Ground-Based Gravitational Wave Detectors is Minimal
Aaron D. Johnson, Katerina Chatziioannou, Will M. Farr
Upgrades beyond the current second generation of ground-based gravitational wave detectors will allow them to observe tens of thousands neutron star and black hole binaries. Given…
Gravitational waves carry information beyond effective spin parameters but it is hard to extract
Simona J. Miller, Zoe Ko, Thomas A. Callister +1
Gravitational wave observations of binary black hole mergers probe their astrophysical origins via the binary spin, namely the spin magnitudes and directions of each component blac…