Claude Amra
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View article: GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences
GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences Open
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…
View article: GW231123: A Binary Black Hole Merger with Total Mass 190–265 <i>M</i> <sub>⊙</sub>
GW231123: A Binary Black Hole Merger with Total Mass 190–265 <i>M</i> <sub>⊙</sub> Open
On 2023 November 23, the two LIGO observatories both detected GW231123, a gravitational-wave signal consistent with the merger of two black holes with masses and (90% credible intervals), at a luminosity dis…
View article: Directional Search for Persistent Gravitational Waves: Results from the First Part of LIGO-Virgo-KAGRA's Fourth Observing Run
Directional Search for Persistent Gravitational Waves: Results from the First Part of LIGO-Virgo-KAGRA's Fourth Observing Run Open
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 gravitatio…
View article: GW250114: Testing Hawking’s Area Law and the Kerr Nature of Black Holes
GW250114: Testing Hawking’s Area Law and the Kerr Nature of Black Holes Open
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 m1=33.6−0.8+1.2M⊙ …
View article: Upper Limits on the Isotropic Gravitational-Wave Background from the first part of LIGO, Virgo, and KAGRA's fourth Observing Run
Upper Limits on the Isotropic Gravitational-Wave Background from the first part of LIGO, Virgo, and KAGRA's fourth Observing Run Open
We present results from the search for an isotropic gravitational-wave background using Advanced LIGO and Advanced Virgo data from O1 through O4a, the first part of the fourth observing run. This background is the accumulated signal from u…
View article: GWTC-4.0: An Introduction to Version 4.0 of the Gravitational-Wave Transient Catalog
GWTC-4.0: An Introduction to Version 4.0 of the Gravitational-Wave Transient Catalog Open
The Gravitational-Wave Transient Catalog (GWTC) is a collection of short-duration (transient) gravitational wave signals identified by the LIGO-Virgo-KAGRA Collaboration in gravitational-wave data produced by the eponymous detectors. The c…
View article: All-sky search for short gravitational-wave bursts in the first part of the fourth LIGO-Virgo-KAGRA observing run
All-sky search for short gravitational-wave bursts in the first part of the fourth LIGO-Virgo-KAGRA observing run Open
We present a search for short-duration gravitational-wave transients in data from the first eight months of Advanced LIGO-Virgo-KAGRA's fourth observing run, denoted O4a. We use four analyses which are sensitive to a wide range of potentia…
View article: All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run
All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run Open
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 ta…
View article: Search for Gravitational Waves Emitted from SN 2023ixf
Search for Gravitational Waves Emitted from SN 2023ixf Open
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 Eng…
View article: Search for Continuous Gravitational Waves from Known Pulsars in the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run
Search for Continuous Gravitational Waves from Known Pulsars in the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run Open
Continuous gravitational waves (CWs) emission from neutron stars carries information about their internal structure and equation of state, and it can provide tests of general relativity. We present a search for CWs from a set of 45 known p…
View article: Impact of localized defects in light scattered by optical components: measurement and analysis
Impact of localized defects in light scattered by optical components: measurement and analysis Open
Defects and contaminants can be a critical source of performance loss. This paper presents and demonstrates the capabilities of a new SPatially and Angularly Resolved Scatterometry Equipment (SPARSE) designed to measure spatially resolved …
View article: Swift-BAT GUANO Follow-up of Gravitational-wave Triggers in the Third LIGO–Virgo–KAGRA Observing Run
Swift-BAT GUANO Follow-up of Gravitational-wave Triggers in the Third LIGO–Virgo–KAGRA Observing Run Open
We present results from a search for X-ray/gamma-ray counterparts of gravitational-wave (GW) candidates from the third observing run (O3) of the LIGO–Virgo–KAGRA network using the Swift Burst Alert Telescope (Swift-BAT). The search include…
View article: A Search Using GEO600 for Gravitational Waves Coincident with Fast Radio Bursts from SGR 1935+2154
A Search Using GEO600 for Gravitational Waves Coincident with Fast Radio Bursts from SGR 1935+2154 Open
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 Astronomic…
View article: Search for gravitational waves emitted from SN 2023ixf
Search for gravitational waves emitted from SN 2023ixf Open
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 19th, during the LIGO-Virgo-KAGRA 15th E…
View article: A search using GEO600 for gravitational waves coincident with fast radio bursts from SGR 1935+2154
A search using GEO600 for gravitational waves coincident with fast radio bursts from SGR 1935+2154 Open
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 CHIME/FRB and STARE2 in 2020 April, after the conclusion of the LIGO, Virgo, and KAGRA Collaborations'…
View article: Comparison of arm cavity optical losses for the two wavelengths of the Einstein Telescope gravitational wave detector
Comparison of arm cavity optical losses for the two wavelengths of the Einstein Telescope gravitational wave detector Open
A new generation of gravitational wave detectors is currently being designed with the likely use of a different laser wavelength compared to current instruments. The estimation of the optical losses for this new wavelength is particularly …
View article: Ultralight vector dark matter search using data from the KAGRA O3GK run
Ultralight vector dark matter search using data from the KAGRA O3GK run Open
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 h…
View article: Observation of Gravitational Waves from the Coalescence of a 2.5–4.5 M <sub>⊙</sub> Compact Object and a Neutron Star
Observation of Gravitational Waves from the Coalescence of a 2.5–4.5 M <sub>⊙</sub> Compact Object and a Neutron Star Open
We report the observation of a coalescing compact binary with component masses 2.5–4.5 M ⊙ and 1.2–2.0 M ⊙ (all measurements quoted at the 90% credible level). The gravitational-wave signal GW230529_181500 was observed during the fourth ob…
View article: Swift-BAT GUANO follow-up of gravitational-wave triggers in the third LIGO-Virgo-KAGRA observing run
Swift-BAT GUANO follow-up of gravitational-wave triggers in the third LIGO-Virgo-KAGRA observing run Open
We present results from a search for X-ray/gamma-ray counterparts of gravitational-wave (GW) candidates from the third observing run (O3) of the LIGO-Virgo-KAGRA (LVK) network using the Swift Burst Alert Telescope (Swift-BAT). The search i…
View article: Stable Phase Retrieval with Mirror Descent
Stable Phase Retrieval with Mirror Descent Open
In this paper, we aim to reconstruct an n-dimensional real vector from m phaseless measurements corrupted by an additive noise. We extend the noiseless framework developed in [15], based on mirror descent (or Bregman gradient descent), to …
View article: Generation of Non-Diffractive Bessel Beams for Near-Field Links Applications Using Meta-Axicons
Generation of Non-Diffractive Bessel Beams for Near-Field Links Applications Using Meta-Axicons Open
International audience
View article: Ultralight vector dark matter search using data from the KAGRA O3GK run
Ultralight vector dark matter search using data from the KAGRA O3GK run Open
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 h…
View article: Thermal radiation transferred to the guided modes of optical interference coatings
Thermal radiation transferred to the guided modes of optical interference coatings Open
An electromagnetic model is developed to predict the thermal radiation which is trapped in a multilayer structure and transferred to its guided modes. The theory is based on the electromagnetic power supplied by the thermal currents given …
View article: Linear-frequency conversion with time-varying metasurfaces
Linear-frequency conversion with time-varying metasurfaces Open
Frequency conversion is a hallmark of nonlinearity. The spectral manifestations, emergent within a system, can typically be attributed to a marked nonlinearity within the material properties, complex geometric configurations, and/or the un…
View article: Comparing Self-Healing Properties of Polarized Weakly-Diffracting Beams
Comparing Self-Healing Properties of Polarized Weakly-Diffracting Beams Open
International audience
View article: Power transfer efficiency for obstructed wireless links using Bessel beams
Power transfer efficiency for obstructed wireless links using Bessel beams Open
The power transfer efficiency of a partially obstructed wireless link operating in the Fresnel region is studied in this work. The wireless link consists of two equal apertures, axially aligned, radiating weakly-diffractive beams (truncate…
View article: Photo-induced thermal radiation of optical interference coatings submitted to a spatio-temporal illumination
Photo-induced thermal radiation of optical interference coatings submitted to a spatio-temporal illumination Open
We present an electromagnetic model for photo-induced thermal radiation in multi-layer interference filters subjected to arbitrary pulsed illumination with limited beam size. Numerical calculation is used to analyze various structures affe…
View article: Frequency-Dependent Squeezed Vacuum Source for the Advanced Virgo Gravitational-Wave Detector
Frequency-Dependent Squeezed Vacuum Source for the Advanced Virgo Gravitational-Wave Detector Open
In this Letter, we present the design and performance of the frequency-dependent squeezed vacuum source that will be used for the broadband quantum noise reduction of the Advanced Virgo Plus gravitational-wave detector in the upcoming obse…
View article: Interferometric quantification and identification of back-reflected and back-scattered light from a system of two optical components
Interferometric quantification and identification of back-reflected and back-scattered light from a system of two optical components Open
In this work, we recorded the retro-reflected and back-scattered light from a system of two components i.e, a single side AR coated SiO2 window and a mirror placed at tilt angle of 10◦ in the transmission of the window. Retro-re…
View article: SPARSE: a high performance scatterometer with imaging ability
SPARSE: a high performance scatterometer with imaging ability Open