Search Results for author: Richard O'Shaughnessy

Found 10 papers, 3 papers with code

Multiband gravitational-wave event rates and stellar physics

1 code implementation31 Jan 2019 Davide Gerosa, Sizheng Ma, Kaze W. K. Wong, Emanuele Berti, Richard O'Shaughnessy, Yanbei Chen, Krzysztof Belczynski

We use population synthesis simulations of isolated binary stars to explore some of the stellar physics that could be constrained with multiband events, and we show that specific formation pathways might be overrepresented in multiband events compared to ground-only detections.

High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology

Wide precession: binary black-hole spins repeatedly oscillating from full alignment to full anti-alignment

no code implementations14 Nov 2018 Davide Gerosa, Alicia Lima, Emanuele Berti, Ulrich Sperhake, Michael Kesden, Richard O'Shaughnessy

Within the framework of 2PN black-hole binary spin precession, we explore configurations where one of the two spins oscillates from being completely aligned with the orbital angular momentum to being completely anti-aligned with it during a single precession cycle.

General Relativity and Quantum Cosmology Astrophysics of Galaxies High Energy Astrophysical Phenomena

Spin orientations of merging black holes formed from the evolution of stellar binaries

2 code implementations7 Aug 2018 Davide Gerosa, Emanuele Berti, Richard O'Shaughnessy, Krzysztof Belczynski, Michael Kesden, Daniel Wysocki, Wojciech Gladysz

We study the expected spin misalignments of merging binary black holes (BHs) formed in isolation by combining state-of-the-art population synthesis models with efficient post-Newtonian evolutions, thus tracking sources from stellar formation to gravitational-wave detection.

High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology

Reconstructing phenomenological distributions of compact binaries via gravitational wave observations

3 code implementations16 May 2018 Daniel Wysocki, Jacob Lange, Richard O'Shaughnessy

Using concrete synthetic data based on projections for LIGO and Virgo's O3 run, we discuss how well GW measurements could constrain the mass and spin distribution of coalescing neutron stars and black holes in the near future, within the context of several phenomenological models described in this work.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Solar and Stellar Astrophysics

Distinguishing black-hole spin-orbit resonances by their gravitational wave signatures. II: Full parameter estimation

no code implementations20 Jul 2015 Daniele Trifirò, Richard O'Shaughnessy, Davide Gerosa, Emanuele Berti, Michael Kesden, Tyson Littenberg, Ulrich Sperhake

Gravitational waves from coalescing binary black holes encode the evolution of their spins prior to merger.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena

Precessional instability in binary black holes with aligned spins

no code implementations30 Jun 2015 Davide Gerosa, Michael Kesden, Richard O'Shaughnessy, Antoine Klein, Emanuele Berti, Ulrich Sperhake, Daniele Trifirò

In this work, we show that these solutions can be unstable when the spin of the higher-mass black hole is aligned with the orbital angular momentum and the spin of the lower-mass black hole is anti-aligned.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena

Multi-timescale analysis of phase transitions in precessing black-hole binaries

no code implementations10 Jun 2015 Davide Gerosa, Michael Kesden, Ulrich Sperhake, Emanuele Berti, Richard O'Shaughnessy

The dynamics of precessing binary black holes (BBHs) in the post-Newtonian regime has a strong timescale hierarchy: the orbital timescale is very short compared to the spin-precession timescale which, in turn, is much shorter than the radiation-reaction timescale on which the orbit is shrinking due to gravitational-wave emission.

General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena

Effective potentials and morphological transitions for binary black-hole spin precession

no code implementations3 Nov 2014 Michael Kesden, Davide Gerosa, Richard O'Shaughnessy, Emanuele Berti, Ulrich Sperhake

We derive an effective potential for binary black-hole (BBH) spin precession at second post-Newtonian order.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena

Resonant-plane locking and spin alignment in stellar-mass black-hole binaries: a diagnostic of compact-binary formation

no code implementations18 Feb 2013 Davide Gerosa, Michael Kesden, Emanuele Berti, Richard O'Shaughnessy, Ulrich Sperhake

Under the plausible assumption that tidal interactions are efficient at aligning the spins of few-solar mass black-hole progenitors with the orbital angular momentum, we find that black-hole spins should be expected to preferentially lie in a plane when they become detectable by gravitational-wave interferometers.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena

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