A5058195915- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- COVID-19 Pandemic Impacts
- COVID-19 epidemiological studies
- History and Developments in Astronomy
- Radio Astronomy Observations and Technology
- Particle Accelerators and Free-Electron Lasers
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Relativity and Gravitational Theory
- Atomic and Subatomic Physics Research
- Space Satellite Systems and Control
- COVID-19 Clinical Research Studies
- earthquake and tectonic studies
- Cognitive Abilities and Testing
- Astro and Planetary Science
- Structural Health Monitoring Techniques
- COVID-19 diagnosis using AI
- Superconducting Materials and Applications
- Acoustic Wave Phenomena Research
Universitat de les Illes Balears
2022-2025
Fundació Universitat-Empresa de les Illes Balears
2024
Laboratoire AstroParticule et Cosmologie
2024
Perimeter Institute
2021-2023
University of Guelph
2020-2022
University of Florida
2018-2022
University College Dublin
2012-2022
Florida Museum of Natural History
2018-2022
European Space Research and Technology Centre
2014-2018
Tulane University
1983
The self-field of a charged particle has singular component which diverges at the particle. We use both coordinate and covariant approaches to compute an expansion this field for particles in generic geodesic orbits about Schwarzschild black hole scalar, electromagnetic gravitational cases. check that yield identical results give, as application, calculation previously unknown mode-sum regularization parameters. In so-called approach self-force calculations, each mode retarded is finite,...
The inspiral of a stellar-mass compact object into massive ($\sim 10^{4}$-$10^{7} M_{\odot}$) black hole produces an intricate gravitational-wave signal. Due to the extreme-mass ratios involved, these systems complete $\sim 10^{4}$-$10^{5}$ orbits, most them in strong-field region hole, emitting frequency range $\sim10^{-4}-1~$Hz. This makes prime sources for space-based observatory LISA (Laser Interferometer Space Antenna). observations will enable high-precision measurements physical...
LISA, the Laser Interferometer Space Antenna, will usher in a new era gravitational-wave astronomy. As first anticipated space-based detector, it expand our view to millihertz sky, where spectacular variety of interesting sources abound: from millions ultra-compact binaries Galaxy, mergers massive black holes at cosmological distances; beginnings inspirals that venture into ground-based detectors' death spiral compact objects holes, and many between. Central realising LISA's discovery...
Abstract On the 29th of May 2023, LIGO–Virgo–KAGRA Collaboration observed a compact binary coalescence event consistent with neutron star – black hole merger, though heavier object mass 2.5 − 4.5 M⊙ would fall into purported lower gap. An alternative explanation for apparent observations events in this range has been suggested as strongly gravitationally lensed stars. In scenario, magnification lead to source appearing closer and than it really is. Here, we investigate chances possible...
In a previous paper, we computed expressions for the Detweiler-Whiting singular field of point scalar, electromagnetic and gravitational charges following geodesic Schwarzschild spacetime. We now extend this to case equatorial orbits in Kerr spacetime, using coordinate covariant approaches compute expansions cases. As an application, give calculation previously unknown mode-sum regularization parameters. also propose new application high-order approximations field, showing how they may be...
On 19th March, the World Health Organisation declared a pandemic. Through this global spread, many nations have witnessed exponential growth of confirmed cases brought under control by severe mass quarantine or lockdown measures. However, some have, through different timeline actions, prevented growth. Currently as continue to tackle growth, others attempt safely lift restrictions whilst avoiding resurgence. This study seeks quantify impact government actions in mitigating viral transmission...
WAIS Digit Span scores of 50 subjects were evaluated to determine the relationship Digits Forward and Backward intellectual functioning in an intellectually subnormal population. The fell into one five levels intelligence, 50—59, 60—69, 70—79, 80—89, 90—99, based upon Full Scale IQ. IQs are significantly more highly correlated all three than Forward. Only (combined forward backward) discriminated across intelligence.
We provide expansions of the Detweiler–Whiting singular field for a particle with scalar moving along arbitrary, planar accelerated trajectories in Schwarzschild spacetime. transcribe these results into mode-sum regularization parameters, computing previously unknown terms that increase convergence rate mode-sum. test our by self-force variety trajectories. For non-uniformly circular orbits we present from new 1+1D discontinuous Galerkin time-domain code which employs an effective source....
The growing reality of gravitational wave astronomy is giving age-old problems a new lease life; one such problem that the self-force. A charged or massive particle moving in curved background space-time produces field affects its motion, pushing it off expected geodesic. This self-field gives rise to so-called self-force acting on particle. In modelling this approach uses perturbative expansion mass ratio. One most interesting sources waves are extreme ratio inspirals - systems perfectly...
A scalar charged particle moving in a curved background spacetime will emit field affecting its own motion; the resolving of this resulting motion is often referred to as self-force problem. This also serves toy model for astrophysically interesting compact body binaries, extreme mass ratio inspirals, targets future space-based gravitational wave detector, LISA. In modelling such systems, point-particle assumption leads problematic singularities which need be safely removed solve regardless...
On 29 May 2023, the LIGO Livingston observatory detected gravitational-wave signal GW230529_181500 from merger of a neutron star with lower mass-gap compact object. Its long inspiral provides unique opportunity to test General Relativity (GR) in parameter space previously unexplored by strong-field tests. In this work, we performed parameterized tests GR GW230529_181500. Specifically, search for deviations frequency-domain GW phase allowing agnostic corrections post-Newtonian coefficients....
On the 29th of May 2023, LIGO-Virgo-KAGRA Collaboration observed a compact binary coalescence event consistent with neutron star-black hole merger, though heavier object mass 2.5-4.5 $M_\odot$ would fall into purported lower gap. An alternative explanation for apparent observations events in this range has been suggested as strongly gravitationally lensed stars. In scenario, magnification lead to source appearing closer and than it really is. Here, we investigate chances possible...
The self-force is the leading method in modelling waveforms for extreme mass ratio inspirals, a key target of ESA's future space-based gravitational wave detector LISA. In these systems, one approximates smaller body as point particle to problematic singularities that need be removed. Modelling this singular structure has settled on Detweiler-Whiting field gold standard. As solution governing equation itself, removal, it leaves smooth regular homogeneous equation, much like its well...
We consider the interplanetary trajectory design problem posed by 8th edition of Global Trajectory Optimization Competition and present end-to-end strategy developed team ACT-ISAS (a collaboration between European Space Agency's Advanced Concepts Team JAXA's Institute Astronautical Science). The resulting won 1st place in competition, achieving a final mission value $J=146.33$ [Mkm]. Several new algorithms were this context but have an interest that go beyond particular considered, thus,...
On 19th March, the World Health Organisation declared a pandemic. Through this global spread, many nations have witnessed exponential growth of confirmed cases brought under control by severe mass quarantine or lockdown measures. However, some have, through different timeline actions, prevented growth. Currently as continue to tackle growth, others attempt safely lift restrictions whilst avoiding resurgence. This study seeks quantify impact government actions in mitigating viral transmission...