Global ETD Search
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Showing 1 to 18 of 18 for “"Gravitational wave (GW)"”.
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Astrophysical signatures of neutron stars in compact binaries and experimental improvements on gravitational-wave detectors
… from super-expansions to moderate expansions. Gravitational-wave (GW) observatories such as Advanced LIGO (aLIGO) open up a new possibility to probe deep inside the NS by examining the tidal signatures in the GW waveforms.
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Systematic and Statistical Uncertainties in the Characterization of Gravitational-Wave Sources
With the increasing number of gravitational-wave (GW) detections made by LIGO-Virgo-Kagra during the first three observing runs, the field of GW astrophysics has a growing need for prompt and precise parameter estimation (PE) of GW sources. To better understand the limitations of the current PE …
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Continuous gravitational wave searches from neutron stars and exotic sources in ground-based interferometric data
… analysis methods for the detection of continuous gravitational waves (CWs), using both real and simulated data. It addresses challenges in the search strategies: targeted searches, where source parameters should be perfectly constrained; narrowband searches, where source position is well …
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Gravitational wave cosmology in general relativity and Einstein-scalar-Gauss-Bonnet gravity.
We study systematically gravitational wave (GW) cosmology in both Einstein’s General Relativity (GR) and Einstein-scalar-Gauss-Bonnet (EsGB) gravity. We first investigate the spacetime singularities of plane GWs in GR and find that only few of them are free of spacetime singularities. In …
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A matched filter technique for slow radio transient detection and first demonstration with the Murchison Widefield Array
… are predicted electromagnetic counterparts of gravitational wave (GW) sources and the most promising progenitor of short gamma-ray bursts. While the next generation of GW detectors have come online and detected the first GW event, their ability to localize these events will remain poor during …
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Development of techniques for quantum-enhanced laser-interferometric gravitational-wave detectors
… for quantum-enhanced laser- interferometric gravitational wave (GW) detectors was carried out. The basic theory of GWs and laser-interferometric GW detectors, quantum noise in GW detectors, the theory of squeezed states including generation, degradation, detection, and control of squeezed …
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Exploring fundamental physics and astrophysics with gravitational-wave sources
… that can be learnt by the current and future gravitational wave (GW) observations. With the current observations, I study how multiple binary black hole (BBH) spin measurements can be combined by hierarchical Bayesian framework to search for ultralight bosons (e.g., axions). This search relies …
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The search for unmodeled gravitational-wave transients in the Advanced LIGO-Virgo Era
Between 2015 and 2017, the era of gravitational-wave (GW) astronomy began in a spectacular fashion. The Advanced-era GW detectors directly observed GW transients from two types of compact-binary sources: binary black holes (e.g., GW150914) and binary neutron stars (e.g., GW170817). Compact-binary …
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Cosmic String Radiation with Adaptive Mesh Refinement
… matter axions. They are also a strong source of gravitational wave (GW) emission, with the potential for detection by the Laser Interferometer Gravitational-Wave Observatory (LIGO) and other GW experiments. The nonlinear evolution of cosmic strings has been extensively studied using large-scale …
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Applications of long storage time optical cavities
… example is a quantum noise filter cavity for gravitational wave (GW) detectors, where an optical cavity is necessary for producing frequency-dependent squeezed states of light to improve the sensitivity over their broad audioband frequency [1]. To test the feasibility of quantum noise filter …
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Analysis methods for gravitational wave from binary neutron star coalescences: investigation on the post-merger phase
… amongst the most promising sources for advanced gravitational wave (GW) detectors. The forthcoming addition of the advanced Virgo interferometer to the LIGO detector network will greatly improve the estimation of GW characteristics and therefore the capabilities to test features in the GW signal …
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Deep learning methods for enabling real-time gravitational wave and multimessenger astrophysics
A new era of gravitational wave (GW) astronomy has begun with the recent detections by LIGO. However, we need real-time observations of GW signals and their electromagnetic (EM) and astro-particle counterparts to unlock its full potential for scientific discoveries. Extracting and classifying the …
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PROBING THE NATURE OF COMPACT OBJECTS: SCATTERING, TIDES AND QUASINORMAL MODES
… (LVK) collaboration has detected 90 confirmed gravitational-wave (GW) events and nearly 200 confident triggers across four observational runs. Coalescing black-hole (BH) and neutron-star (NS) binaries are primary GW sources, offering the unique possibility to probe the nature of compact objects …
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Decoding Continuous Gravitational Waves from Pulsars: A Multi-Wavelength Approach
The detection of continuous gravitational wave (CW) signals from isolated neutron stars will provide new insights into the physics of neutron stars and significantly contribute to the field of gravitational wave (GW) astronomy. CW signals are expected, for instance, from young pulsars with …
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Secular Dynamics of Binaries in Stellar Clusters
… triples, but they can also stem from the gravitational field of an extended stellar system (e.g. galaxy or globular cluster) in which the binary resides. Due to the weakness of the external perturbation, the resulting orbital evolution is usually secular in nature, i.e. it occurs on …
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Relativistic Jets from Compact Binary Mergers as Electromagnetic Counterparts to Gravitational Wave Sources
The advent of gravitational wave (GW) astronomy has provided a new window through which to view and understand the Universe. To fully exploit the potential of GW astronomy, an understanding of all the potential electromagnetic counterparts to a gravitational wave detected source will help maximise …
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Uncovering gravitational wave signatures of modified theories of gravity and exotic matter
The observation of the first gravitational-wave (GW) event almost a decade ago opened a new promising window to our scientific endeavours in understanding the deepest mysteries of our Universe and its history. Using the foundations of general relativity (GR), we are now in the position of being …
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Enhancing the detection and the reconstruction of gravitational-wave transients in the LIGO-Virgo-KAGRA data using weak assumptions on the astrophysical sources
Since the first observation of a gravitational-wave (GW) in 2015, the LIGO and Virgo detectors reported tens of astrophysical signals interpreted as mergers of compact objects. These observations provide invaluable tests of the General Relativity and open a new era of astronomy, unveiling compact …