Frequency dependent squeezing using a 300 meter filter cavity is a well established technique for broadband quantum noise reduction in current gravitational wave detectors. However, in advanced detector configurations, more than one filter cavity is required. An alternative method uses EPR entanglement to achieve the required quantum noise response without the construction of extra vacuum...
The coincident observation of GW170817 and GRB170817A has provided unprecedented insight into the physical connection between binary neutron star mergers and short gamma-ray bursts. In this work, we perform a multi-messenger study with the aim of constraining the jet geometry of sGRBs, assuming that all BNS mergers produce relativistic jets. Our analysis incorporates gravitational-wave data...
The LIGO-Virgo-KAGRA (LVK) collaboration has detected over 300 gravitational-wave events, mostly from binary black hole (BBH) mergers. These detections enable precise inference of BBH population properties such as masses, redshift, and spins. However, the conventional spin prior—uniform in spin magnitude and isotropic in orientation—assigns near-zero probability density near effective spin...
The gravitational-wave detector KAGRA concluded the observing run on 19 November (JST) and started the post O4c commissioning activities. During the observing run, KAGRA achieved a maximum sensitivity of 7.5 Mpc owing to the commissioning activity before and during the O4c observing run. In this talk, I will provide the KAGRA commissioning status and the future plans on the commissioning to...
Matched-filtering techniques are the standard approach for detecting compact binary coalescences (CBCs) and have been employed in all confirmed gravitational-wave (GW) detections to date. However, these methods rely on large banks of accurately modeled waveform templates, making them unsuitable for poorly modeled or unmodeled sources such as core-collapse supernovae (CCSN) and other unknown...
By leveraging a high performance noise reduction algorithm and the bespoke deep-learning architectures developed by us, we are constructing a pipeline for searching anomalous gravitational wave bursts. The pipeline consists of three parts: BEACON, DeepGRAV and GenGRAV. I will introduce the basic concepts of this work in this talk.
In this talk, I will introduce the development of the unmodeled search pipeline BEACON. The pipeline has a block-wise structure that consists of four stages: denoising, anomaly clustering, significance evaluation, and coincidence analysis. We tested the framework on GWTC-1 BBH events and off-catalog BBH signals from the O2 run. With its efficient computation, the pipeline demonstrates...
I'll present a method to optimize the analysis of long-duration Gravitational Waves (GWs) from compact binary coalescences (CBCs). A typical example is GWs from compact objects with masses below that of the Sun. The LIGO–Virgo–KAGRA (LVK) collaboration, operating the world’s most sensitive GW observatories, searches for CBC signals in the 0.2–1.0 solar mass range, providing leading constraints...
Non-merging ringdown radiations have recently been discovered when two black holes closely encounter and fly-by away afterward. We present some features of such radiations for a wider space of the impact parameter and initial velocity characterizing hyperbolic encounters. Different patterns of gravitational radiations from the merging ones are also presented, focusing on the beaming effect due...
