A5088493919- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Business Strategy and Innovation
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Measurement and Metrology Techniques
- Experimental and Theoretical Physics Studies
- Adaptive optics and wavefront sensing
- Relativity and Gravitational Theory
- Quantum, superfluid, helium dynamics
Chung-Ang University
2024
Institute for Basic Science
2022-2024
Seoul National University
2017-2020
National Institute for Mathematical Sciences
2020
Korea Astronomy and Space Science Institute
2017
Dense astrophysical environments like globular clusters and galactic nuclei can host hyperbolic encounters of black holes which lead to gravitational-wave driven capture. There are several models predict a fraction binary hole mergers come from these radiation-driven capture scenarios. In this paper, we present the sensitivity search toward events for O3, third observing run LIGO Virgo. We use waveforms produced by numerical relativity simulations covering four different mass ratios at least...
The gravitational radiation driven capture (GR capture) between unequal mass black holes without spins has been investigated with numerical relativistic simulations. We adopt the parabolic approximation which assumes that wave from a weakly hyperbolic orbit is same as having pericenter distance. Using radiated energies simulations, we have obtained critical impact parameter (${b}_{\mathrm{crit}}$) for GR function of initial energy. most energetic encounters occur around boundary direct...
ABSTRACT As the number of gravitational wave observations has increased in recent years, variety sources broadened. Here, we investigate whether it is possible for current generation detectors to distinguish between very short-lived signals from mergers high-mass black holes and signal produced by a close encounter two holes, which results capture ultimately merger. We compare posterior probability distributions analysing simulated both types progenitor events, under ideal realistic...
Abstract The orbits of two black holes (BHs) that are initially unbound can be transformed into bound by emitting gravitational waves during close encounters in a star cluster, which is called gravitational-wave (GW) capture. effects spin BHs on GW capture investigated the context numerical relativity. radiated energy encounter dependent effective when have equal masses, as expected from post-Newtonian approximation. strongest emission produced spins both anti-aligned to orbital angular...
Abstract Mid-frequency band gravitational-wave detectors will be complementary to the existing Earth-based (sensitive above 10 Hz or so) and future space-based such as Laser Interferometer Space Antenna (LISA), which sensitive below around mHz. A ground-based superconducting omnidirectional gravitational radiation observatory (SOGRO) has recently been proposed along with several design variations for frequency of 0.1–10 Hz. For two conceptual designs SOGRO (i.e. advanced [aSOGRO]), we...
Microlensing is one of the most promising tools for discovering stellar-mass black holes (BHs) in Milky Way because it allows us to probe dark or faint celestial compact objects. While existence BHs has been confirmed through observation X-ray binaries within our galaxy and gravitational waves from extragalactic BH binaries, a conclusive microlensing events caused by Galactic yet be achieved. In this study, we focus on those with high eccentricity, including unbound orbits, which can...
We have numerically investigated close scattering processes of two black holes (BHs). Our careful analysis shows for the first time a nonmerging ringdown gravitational wave induced by dynamical tidal deformations individual BHs during their encounter. The frequencies turn out to agree well with quasinormal ones single BH in perturbation theory, despite its distinctive physical context from merging case. study new type waveform and opens up exploration strong interactions using encounters.
The orbits of two black holes which are initially unbound can be transformed into bound by emitting gravitational waves during close encounters in a star cluster, is called wave (GW) capture. effects spin on GW capture investigated the context numerical relativity. radiated energy encounter dependent effective when have equal masses as expected from post-Newtonian approximation. strongest emission produced spins both anti-aligned to orbital angular momentum case fly-by encounters. But...
We have numerically investigated close scattering processes of two black holes (BHs). Our careful analysis shows for the first time a non-merging ringdown gravitational wave coming from dynamical tidal deformations individual BHs during their encounter. The frequencies turn out to agree well with quasi-normal ones single BH in perturbation theory, despite its distinctive physical context merging case. study new type waveform and opens up exploration strong interactions using encounters.
The detection method of gravitational waves (GW) using electromagnetic (EM) cavities has garnered significant attention in recent years. This paper thoroughly examines the analysis for perturbation EM field and raises some issues existing literature. Our work demonstrates that rigid condition imposed on material, as provided literature, is inappropriate due to its reliance a gauge-dependent quantity cannot be controlled experimentally. Instead, we incorporate elasticity into material revise...
Dense astrophysical environments like globular clusters and galactic nuclei can host hyperbolic encounters of black holes which lead to gravitational-wave driven capture. There are several models predict a fraction binary hole mergers come from these radiation-driven capture scenarios. In this paper we present the sensitivity search towards events for O3, third observing run LIGO Virgo. We use waveforms produced by numerical relativity simulations covering four different mass ratios at least...
Recently, many Nobel Prizes in Physics have been awarded the field of astrophysics. Gravitational wave observations and contributions to LIGO 2017, cosmology exoplanets 2019, black hole formation theory discovery a supermassive 2020. Surprisingly, that these topics, which are somewhat distant from our daily life, great physical significance being actively studied worldwide. We invited young astrophysicists at forefront astrophysic research share their thoughts on That conversation took place...