D. Watarai

GWTC-4.0: Methods for Identifying and Characterizing Gravitational-wave Transients

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley et autres

Abstract The Gravitational-Wave Transient Catalog (GWTC) is a collection of candidate gravitational-wave transient signals identified and characterized by the LIGO–Virgo–KAGRA Collaboration. Producing the contents of the GWTC from detector data requires complex analysis methods. These comprise techniques to model the signal; identify …

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Directional search for persistent gravitational waves: Results from the first part of LIGO-Virgo-KAGRA’s fourth observing run

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley et autres

The angular distribution of gravitational-wave power from persistent sources may exhibit anisotropies arising from the large-scale structure of the Universe. This motivates directional searches for astrophysical and cosmological gravitational-wave backgrounds, as well as continuous-wave emitters. We present results of such a search …

de, it, gb, au, us, in, fr, be, br, jp, nl, es, mx, kr (code pays fourni par la source)

GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley et autres

Abstract We report the observation of gravitational waves from two binary black hole coalescences during the fourth observing run of the LIGO–Virgo–KAGRA detector network, GW241011 and GW241110. The sources of these two signals are characterized by rapid and precisely measured primary spins, …

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GW250114: Testing Hawking’s Area Law and the Kerr Nature of Black Holes

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley et autres

The gravitational-wave signal GW250114 was observed by the two LIGO detectors with a network matched-filter signal-to-noise ratio of 80. The signal was emitted by the coalescence of two black holes with near-equal masses m_{1}=33.6_{-0.8}^{+1.2}M_{⊙} and m_{2}=32.2_{-1.3}^{+0.8}M_{⊙}, and small spins χ_{1,2}≤0.26 (90% credibility) …

de, it, gb, au, us, in, fr, be, br, jp, nl, es, mx, kr (code pays fourni par la source)

All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run

The LIGO Scientific Collaboration, the KAGRA Collaboration, Adrian Abac, I. Abouelfettouh et autres

We present an all-sky search for long-duration gravitational waves (GWs) from the first part of the LIGO-Virgo-KAGRA fourth observing run (O4), called O4a and comprising data taken between 24 May 2023 and 16 January 2024. The GW signals targeted by this search …

Analyzing black-hole ringdowns with orthonormal modes

S. Morisaki, D. Watarai

The ringdown signal following a black hole (BH) merger can be modeled as a superposition of BH quasinormal modes (QNMs), offering a clean setup for testing gravitational theories. In particular, detecting multiple QNMs enables consistency checks of their frequencies and damping times, …

Search for Gravitational Waves Emitted from SN 2023ixf

Adrian Abac, R. Abbott, I. Abouelfettouh, F. Acernese et autres

Abstract We present the results of a search for gravitational-wave transients associated with core-collapse supernova SN 2023ixf, which was observed in the galaxy Messier 101 via optical emission on 2023 May 19, during the LIGO–Virgo–KAGRA 15th Engineering Run. We define a five-day …

A Search Using GEO600 for Gravitational Waves Coincident with Fast Radio Bursts from SGR 1935+2154

Adrian Abac, R. Abbott, I. Abouelfettouh, F. Acernese et autres

Abstract The magnetar SGR 1935+2154 is the only known Galactic source of fast radio bursts (FRBs). FRBs from SGR 1935+2154 were first detected by the Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB and the Survey for Transient Astronomical Radio Emission 2 in 2020 …

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Search for Eccentric Black Hole Coalescences during the Third Observing Run of LIGO and Virgo

Adrian Abac, R. Abbott, Haruka Abe, F. Acernese et autres

Abstract Despite the growing number of binary black hole coalescences confidently observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains …

fr (code pays fourni par la source)

Ultralight vector dark matter search using data from the KAGRA O3GK run

The LIGO Scientific Collaboration, the KAGRA Collaboration, Adrian Abac, R. Abbott et autres

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 length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing …

Search for gravitational-lensing signatures in the full third observing run of the LIGO-Virgo network

The LIGO Scientific Collaboration, the KAGRA Collaboration, R. Abbott, H. Abe et autres

Gravitational lensing by massive objects along the line of sight to the source causes distortions of gravitational wave-signals; such distortions may reveal information about fundamental physics, cosmology and astrophysics. In this work, we have extended the search for lensing signatures to all …

Open data from the third observing run of LIGO, Virgo, KAGRA and GEO

the KAGRA Collaboration, R. Abbott, H. Abe, F. Acernese et autres

The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, LIGO Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed of three phases: O3a starting in April of 2019 and lasting …