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Mr Nunziato Sorrentino (University of Pisa and INFN-Pisa)
Gravitational wave (GW) emission from close encounters (CEs) between neutron stars (NSs) and/or black holes (BHs) binary are recently being considered as new potential astrophysical sources for ground-based detectors. CEs are mostly part of three-body systems, constrained by a dense stellar environment. Their GW emission is the result of a dynamical capture, whose waveform is hard to model...
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En-Tzu Lin
Ever since the joint discovery of GW170817 and GRB170817A, neutron star mergers and their associated gamma-ray burst events have been a focus of study in the field of multi-messenger astronomy. While Bayesian inference is an effective method for performing model comparison and parameter inference, its application is limited by the computational cost of evaluating the likelihood function of any...
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Mr Wasim Javed (Cardiff University)
The MLy Gravitational-Wave Transient Burst detection pipeline has entered an advanced stage of development in preparation for its debut in O4. A crucial part of the desired low-latency detection is the rapid generation of Sky Localisation maps in order to allow the opportunity for multi-messenger follow-up. We apply a coherent reconstruction of a linear combination of detectors using the...
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Mr Keito Watanabe (University of Bonn)
The sources of Ultra-High-Energy Cosmic Rays (UHECRs) have yet to be discovered due to the extensive number of parameters that influence the primary energy and direction. The Galactic Magnetic Field (GMF) strongly influences the deflections of said UHECRs and is a crucial factor in determining UHECR sources. In this work, we build upon the idea of the Bayesian source fraction analysis...
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Andrea Virtuoso (Istituto Nazionale di Fisica Nucleare)
In spite of the fact that gravitational-wave (GW) interferometers detect GWs in a very complicated (and very clever) way, the final output (i.e. that used for data analysis, obtained after calibration and other processes) is up to now quite simple: the detected strain is linear in the two GW polarizations, which are multiplied by the corresponding antenna patterns which describe the detector’s...
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Cecilia Sgalletta (SISSA)
Binary neutron star (BNS) systems play a central role in many areas of modern astrophysics. Thanks to high precision of timing measurements of pulsars, BNSs can be considered as cosmic laboratories for gravitational physics. Furthermore, their mergers can be loud sources of gravitational waves, the observation of the electromagnetic counterpart of GW170817 paved the way for new frontiers in...
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Mr Soummyadip Basak (ICTS-TIFR, Bangalore, India)
If a significant fraction of dark matter is in the form of compact objects, they will cause microlensing effects in the gravitational-wave signals observable by LIGO and Virgo. From the nonobservation of microlensing signatures in the binary black hole events from the first two observing runs and the first half of the third observing run, we constrain the fraction of compact dark matter in the...
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Ulyana Dupletsa (Istituto Nazionale di Fisica Nucleare)
Cosmological parameters can be constrained if simultaneous access to distance and redshift measurements is achieved. Gravitational waves from compact binaries represent the so-called standard sirens, as their waveform provides direct information about the luminosity distance to the source. However, we do need some non gravitational information to break the degeneracy between source mass and...
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Mr Kumar Akhil Kukkadapu
Linear Variable Differential Transformers(LVDTs) are the standard, precise, non contact position sensors used in VIRGO and KHAGRA suspension systems which are UHV compatible. The main working principle of this sensor is conversion of linear displacement into an electrical signal through mutual induction. This can be combined with voice coil actuators. Due to their extreme importance in...
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Mr Kamal Krishna Nath (Indian Institute of Science Education and Research Bhopal)
A spinning gyro orbiting around a massive compact astrophysical body can capture the general relativistic effects around the central object. If the gyro rotates at some fixed orbit around the star, then the qualitative and quantitative nature of the overall gyro precession frequency can reveal various properties of the central object. If the central object has a companion, then the precession...
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Lorenzo Piga (Istituto Nazionale di Fisica Nucleare)
Primordial Black Holes (PBHs) maybe formed in the Early Universe during the so called radiation-dominated era, significantly before the appearance of the first nuclei and the first stars. The interest on this dark matter candidate was renewed after the first binary black hole gravitational gave event detected by the LIGO-Virgo Collaboration. In particular it was proposed that PBHs with masses...
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Mr Syed Naqvi (Astronomical Observatory, Jagiellonian University)
The phenomena of standing waves are well known in a mechanical and electromagnetic setting where the wave has the maximum and minimum amplitude at the antinodes and nodes, respectively. In the context of the exact solution to Einstein's field equations, we analyze a spacetime that represents standing gravitational
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waves in an expanding Universe. The study of the motion of free masses is... -
Elena Codazzo (GSSI)
The next generation of interferometers will be able to detect a great number of signals from different kinds of sources. Among these sources there may be bursts from close encounters between black holes (BHs) in star clusters. In our work, we present a first study of how often single-binary BH encounters can happen in nuclear star clusters (NSCs) as a function of redshift, and whether these...
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Jahed Abedi (University of Stavanger)
Being arguably the most massive binary black hole merger event observed to date, GW190521 deserves special attention. The exceptionally loud ringdown of this merger makes it an ideal candidate to search for gravitational wave echoes, a proposed smoking gun for the quantum structure of black hole horizons. We perform an unprecedented multi-pronged search for echoes via two well-established and...
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Francesco Gabrielli (SISSA)
Black hole – neutron star (BHNS) binaries are among the least known objects in the Universe. Only recently were we able to observe them for the first time, and not via the traditional channel of electromagnetic (EM) waves, but through the new window of gravitational waves (GWs). In January 2020, the detectors of the LIGO/Virgo/KAGRA collaboration (LVK) detected two GW signals compatible with...
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Sagnik Chatterjee (Indian Institute of Science Education and Research Bhopal)
Neutron stars are very dense objects found in the universe. These neutron stars can have very high angular velocity about their axis, such fast-spinning neutron stars are also known as pulsars. The rotation axis of a pulsar is defined as the axis around which a star rotates, similarly, we can define an axis called a magnetic axis, which is the axis along which the magnetic field lines...
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Srashti Goyal
Ezquiaga et al. 2020, showed that the lensing of gravitational waves(GWs) by intervening mass, in the theories beyond general relativity(GR) can mix and alter the speed of GW polarisations. As a result, the individual polarisations would reach detector with a time delay in between. In this study, we follow up on observational prospects of the scrambling of GWs, i.e when the time delay between...
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Yohei Nishino (The University of Tokyo)
Output Mode Cleaner (OMC) is implemented at the AS port to enhance sensitivity of GW detectors, filtering out junk light, including HOMs and RF sidebands, thereby reducing the shot noise. Since it is the last hardware part of GW detectors passing light that carries GW signals, its performance directly affects sensitivity.
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As for KAGRA OMC, some problems were found in O3GK. The most... -
Aditya Kumar Sharma (International Centre for Theoretical Sciences)
We study the prospects of detecting continuous gravitational waves (CGWs) from spinning neutron stars, gravitationally lensed by the galactic supermassive black hole. Assuming various astrophysically motivated spatial distributions of galactic neutron stars, we find that CGW signals from a few ($\sim 0-6$) neutron stars should be strongly lensed. Lensing will produce two copies of the signal...
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Geunhee Gwak (Korea Institute of Science and Technology)
We report an experimental generation of squeezed light at 1550nm using a continuous-wave laser. An electric field noise reduction of 1.5 dB below the shot noise was observed. To generate squeezed light, we employed parametric down conversion (PDC) process where 775nm pump light is converted to 1550nm squeezed field. The 775nm pump was produced by second harmonic generation (SHG) in a single...
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Mr Michael Norman (Cardiff University)
In recent years there has been been an explosion in the use of artificial neural network transformer models to solve a variety of different problems across many fields. In this paper we take the transformer model archetype and apply it to a well understood problem in Gravitational-Wave data analysis - the detection of Compact Binary Coalescences (CBCs), mergers of black holes and neutron...
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Luca D'Onofrio (Istituto Nazionale di Fisica Nucleare)
We present a multiple test for the targeted search of continuous gravitational waves from an ensemble of known pulsars, combining multidetector single pulsar statistics defined through the 5n-vector method. In order to maximize the detection probability, we describe a rank truncation method to select the most promising sources within the ensemble, based on the p-values computed for single...
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Giulio Favaro (Istituto Nazionale di Fisica Nucleare)
In the current development of optical coatings for high precision instruments like GW interferometers thermal Brownian noise currently pose a limiting factor on the performances obtainable. In particular in the VIRGO experiment, in the 50-300 Hz region, thermal brownian noise act as the dominant contribution.
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Since the Brownian noise is commonly attributed to the existence of many local...
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