A5060349911- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- Statistical and numerical algorithms
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Adaptive optics and wavefront sensing
- Relativity and Gravitational Theory
- Astronomy and Astrophysical Research
- Neutrino Physics Research
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- GNSS positioning and interference
Eötvös Loránd University
2015-2024
Columbia University
2013
We introduce a value-added full-sky catalogue of galaxies, named as Galaxy List for the Advanced Detector Era, or GLADE. The purpose this is to (i) help identifications host candidates gravitational-wave events, (ii) support target selections electromagnetic follow-up observations candidates, (iii) provide input data on matter distribution local Universe astrophysical cosmological simulations, and (iv) poorly localized transients, such gamma-ray bursts observed with InterPlanetary Network....
Mergers of binary black holes on eccentric orbits are among the targets for second-generation ground-based gravitational-wave detectors. These sources may commonly form in galactic nuclei due to emission during close flyby events single objects. We determine distributions initial orbital parameters a population these sources. Our results show that dimensionless pericenter distance systematically decreases with component masses and mass central supermassive hole, its distribution depends...
We present GLADE+, an extended version of the GLADE galaxy catalogue introduced in our previous paper for multimessenger searches with advanced gravitational-wave detectors. GLADE+ combines data from six separate but not independent astronomical catalogues: GWGC, 2MPZ, 2MASS XSC, HyperLEDA, and WISExSCOSPZ catalogues, SDSS-DR16Q quasar catalogue. To allow corrections CMB-frame redshifts peculiar motions, we calculated velocities along their standard deviations all galaxies having $B$-band...
Abstract We outline the “dark siren” galaxy catalog method for cosmological inference using gravitational wave (GW) standard sirens, clarifying some common misconceptions in implementation of this method. When a confident transient electromagnetic counterpart to GW event is unavailable, identification unique host general challenging. Instead, as originally proposed by Schutz, one can consult and implement dark siren statistical approach incorporating all potential galaxies within...
Searches for gravitational waves (GWs) traditionally focus on persistent sources (e.g., pulsars or the stochastic background) transients compact binary inspirals core-collapse supernovae), which last timescales of milliseconds to seconds. We explore possibility long GW with unknown waveforms lasting from many seconds weeks. propose a novel analysis technique bridge gap between short O(s) burst analyses and analyses. Our utilizes frequency-time maps strain cross-power two spatially separated...
Abstract We present the first test of coasting cosmological models with gravitational-wave (GW) standard sirens observed in three observing runs LIGO–Virgo–KAGRA detector network. apply statistical galaxy catalog method adapted to cosmologies and infer constraints on H 0 Hubble constant for fixed values curvature parameter <?CDATA $k=\left\{-1,0,+1\right\}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>k</mml:mi> <mml:mo>=</mml:mo> <mml:mfenced...
We provide a comprehensive multi-aspect study of the performance pipeline used by LIGO-Virgo Collaboration for estimating parameters gravitational-wave bursts. add simulated signals with four different morphologies (sine-Gaussians (SGs), Gaussians, white-noise bursts, and binary black hole signals) to noise samples representing two Advanced LIGO detectors during their first observing run. recover them BayesWave (BW) its accuracy in sky localization, waveform reconstruction, estimation...
Abstract Mergers of stellar-mass black holes on highly eccentric orbits are among the targets for ground-based gravitational-wave detectors, including LIGO, VIRGO, and KAGRA. These sources may commonly form through emission in high-velocity dispersion systems or secular Kozai–Lidov mechanism triple systems. Gravitational waves carry information about binaries’ orbital parameters source location. Using Fisher matrix technique, we determine measurement accuracy with which LIGO–VIRGO–KAGRA...
Abstract We test and compare coasting cosmological models with curvature parameters <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>k</mml:mi> <mml:mo>=</mml:mo> <mml:mfenced close="}" open="{"> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> <mml:mo>,</mml:mo> <mml:mn>0</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:mfenced> </mml:math> in <mml:msubsup> <mml:mi>H</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>c</mml:mi> </mml:msup> units...
Galactic nuclei are expected to be one of the main sites for formations eccentric binary black holes (EBBHs), with an estimated detection rate $\mathcal{O}(1-100$ yr$^{-1})$ Advanced LIGO (aLIGO) detectors operating at design sensitivity. The two formation channels these binaries gravitational capture and secular Kozai-Lidov mechanism, expectedly commensurable rates. We used Monte Carlo simulations construct eccentricity distributions EBBHs formed through in galactic nuclei, time their...
We aim to find the optimal site locations for a hypothetical network of 1 -3 triangular gravitational-wave telescopes.We define following N -telescope figures merit (FoMs) and construct three corresponding metrics: (a) capability reconstructing signal polarization; (b) accuracy in source localization; (c) parameters standard binary source.We also combined metric that takes into account FoMs with practically equal weight.After constructing geomap possible telescope sites, we give 2-telescope...
We present an experimental opportunity for the future to measure possible violations Newton's 1/r^2 law in 0.1-10 meter range using Dynamic gravity Field Generators (DFG) and taking advantage of exceptional sensitivity modern interferometric techniques. The placement a DFG proximity one interferometer's suspended test masses generates change local gravitational field that can be measured at high signal noise ratio. use multiple DFGs null experiment configuration allows composition...
We propose an observational test for gravitationally recoiling supermassive black holes (BHs) in active galactic nuclei, based on a correlation between the velocities of BHs relative to their host galaxies, |Δv|, and obscuring dust column densities, Σdust (both measured along line sight). use toy models distribution recoil velocities, BH trajectories, geometry tori centres, simulate 2.5 × 105 random observations quasars. with comparable escape velocity from centre remain bound nucleus, do...
We present two general methods, the so-called Locust and generalized Hough algorithm, to search for narrow-band signals of moderate frequency evolution limited duration in datastreams gravitational wave detectors. Some models long gamma-ray bursts (e.g. van Putten et al 2004 Phys. Rev. D 69 044007) predict burst emitted during event. These types give rise curling traces local maxima time?frequency space that can be recovered via image processing methods (Locust Hough). Tests algorithms...
Our current understanding of the core-collapse supernova explosion mechanism is incomplete, with multiple viable models for how initial shock wave might be energized enough to lead a successful explosion. Detection gravitational-wave signal emitted in few seconds after stellar would provide unique and crucial insight into this process. With Advanced LIGO Virgo detectors expected approach their design sensitivities soon, we could potentially detect from within our galaxy. In anticipation such...
We present a comprehensive study on how well gravitational-wave signals of binary black holes with nonzero eccentricities can be recovered state the art model-independent waveform reconstruction and parameter estimation techniques. For this we use BayesWave, Bayesian algorithm used by LIGO-Virgo Collaboration for unmodeled reconstructions signal waveforms parameters. two different models to produce simulated eccentric orbits embed them in samples noise design-sensitivity Advanced LIGO...
Abstract We review the impact of an online course on gravitational-wave astrophysics aimed at high school students. launched video in 2021 web page Webuni Hungarian. Since then, there have been more than 300 participants attending course. Our case study to determine how well such a can give overall picture about topic and measure attitude Year 9 10 students physics change with their participation The data were collected from 22 academic year 2021/2022 surveys measuring changes knowledge...
Abstract We propose a method to detect possible non-stationarities of gamma-ray burst jets. Assuming that the dominant source variability in prompt gamma light curve is non-stationarity jet, we show there should be connection between measure and characteristic angle jet derived from break time afterglow. carried out Monte Carlo simulations long observations assuming three radial luminosity density profiles for jets randomizing all parameters, created samples curves by simulating undergoing...
We show that for detections of gravitational-wave transients, constraints can be given on physical parameters the source without using any specific astrophysical models. Relying only fundamental principles general relativity, we set upper limits size, mass, and distance solely from characteristics observed waveform. If is known independent (e.g. electromagnetic) observations, also lower mass size. As a demonstration, tested these binary black hole signals by LIGO Virgo detectors during their...
Abstract We propose an observational test for gravitationally recoiling supermassive black holes in active galactic nuclei, based on a positive correlation between the velocities of relative to their host galaxies, |Δ v |, and obscuring dust column densities, Σ , both measured along line sight. Our findings using set toy models implemented Monte Carlo simulation imply that centre recoil dynamics can be tested by future observations potential –|Δ | correlation. have also found fraction...
We introduce two novel time-dependent figures of merit for both online and offline optimizations advanced gravitational-wave (GW) detector network operations with respect to (i) detecting continuous signals from known source locations (ii) GWs neutron star binary coalescences local galaxies, which thereby have the highest potential electromagnetic counterpart detection. For each these scientific goals, we characterize an $N$-detector network, all its $(N-1)$-detector subnetworks, identify...