S Antier

GWTC-5.0: Tests of General Relativity

T K ND TPC collaboration, A. G. Abac, A. Abe, I. Abouelfettouh et autres

The signals from the LIGO-Virgo-KAGRA network of gravitational-wave (GW) detectors allow us to perform sensitive tests of general relativity (GR) in the dynamical and strong-field regime of gravity. We present the results of seven tests of GR using the observed binary signals …

Can We Find the Emission Mechanism Behind the Extremely Bright GRB 230812B?

Utkarsh Pathak, Sameer K. Patil, Hitesh Tanenia, Yashowardhan Rai et autres

GRB 230812B is a bright long-duration GRB with a luminous, long-lived afterglow and an AstroSat/CZTI polarization measurement during the prompt phase, enabling a joint study of its prompt spectral evolution, polarization, and broadband afterglow. Time-resolved spectroscopy of the prompt emission shows that …

in, us, cn, ie (code pays fourni par la source)

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

A.G 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 using data …

fr (code pays fourni par la source)

Searches for Binary Mergers with Sub-solar Mass Components in Data from the First Part of LIGO--Virgo--KAGRA's Fourth Observing Run

the LSST Dark Energy Science Collaboration, A. G. Abac, I. Abouelfettouh, F. Acernese et autres

We report on a gravitational wave search for compact binary coalescences involving at least one component with mass between $0.2\,M_\odot$ to $1\,M_\odot$, and ratio of component masses between 0.1 and 1. The analysis uses data collected by the LIGO detectors between May …

All-sky search for continuous gravitational-wave signals from unknown neutron stars in binary systems in the first part of the fourth LIGO-Virgo-KAGRA observing run

A.G Abac, I Abouelfettouh, F Acernese, K Ackley et autres

International audience

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Cosmological and High Energy Physics implications from gravitational-wave background searches in LIGO-Virgo-KAGRA's O1-O4a runs

A.G Abac, I Abouelfettouh, F Acernese, K Ackley et autres

International audience

fr (code pays fourni par la source)

GWTC-4.0: Constraints on the Cosmic Expansion Rate and Modified Gravitational-wave Propagation

A.G Abac, I Abouelfettouh, F Acernese, K Ackley et autres

International audience

fr (code pays fourni par la source)

GW230814: Investigation of a Loud Gravitational-wave Signal Observed with a Single Detector

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

Abstract GW230814, detected by the LIGO Livingston observatory with a signal-to-noise ratio of 42.4, represents the loudest gravitational-wave signal in the GWTC-4.0 catalog. Its source is consistent with a binary black hole coalescence with component masses m 1 = 33 . 7 …

Full Band All-sky Search for Periodic Gravitational Waves in the O1 LIGO Data

T K ND TPC collaboration, T. D. Abbott, R (15485435) Abbott, T. D. Abbott et autres

We report on a new all-sky search for periodic gravitational waves in the frequency band 475-2000 Hz and with a frequency time derivative in the range of [-1.0,+0.1]×10-8 Hz/s. Potential signals could be produced by a nearby spinning and slightly nonaxisymmetric isolated …

GW170817: Implications for the Stochastic Gravitational-Wave Background from Compact Binary Coalescences

T K ND TPC collaboration, T. D. Abbott, R (15485435) Abbott, T. D. Abbott et autres

The LIGO Scientific and Virgo Collaborations have announced the first detection of gravitational waves from the coalescence of two neutron stars. The merger rate of binary neutron stars estimated from this event suggests that distant, unresolvable binary neutron stars create a significant …