96 citations · 486 across the 16 of their papers we have counts for
16 papers
Multimessenger prospects of quasi-periodic eruptions
Vojtěch Witzany, Alessia Franchini, Matteo Bonetti +1
Quasi-Periodic Eruptions (QPEs) are recurring soft X-ray transients that may be generated by inspirals of stellar-mass objects spiraling into supermassive black holes, known as ext…
Analytic Solution for the Motion of Spinning Particles in Kerr Space-Time
Viktor Skoupý, Vojtěch Witzany
The equations of motion of massive test particles near Kerr black holes are separable in Boyer-Lindquist coordinates, as established by Carter. This separability, however, is lost…
Actions of spinning compact binaries: Spinning particle in Kerr matched to dynamics at 1.5 post-Newtonian order
Vojtěch Witzany, Viktor Skoupý, Leo C. Stein +1
The motion of compact binaries is influenced by the spin of their components starting at the 1.5 post-Newtonian (PN) order. On the other hand, in the large mass ratio limit, the sp…
Post-Newtonian expansions of extreme mass ratio inspirals of spinning bodies into Schwarzschild black holes
Viktor Skoupý, Vojtěch Witzany
Space-based gravitational-wave detectors such as LISA are expected to detect inspirals of stellar-mass compact objects into massive black holes. Modeling such inspirals requires fu…
Fast inspirals and the treatment of orbital resonances
Philip Lynch, Vojtěch Witzany, Maarten van de Meent +1
Extreme mass ratio inspirals (EMRIs), where a compact object orbits a massive black hole, are a key source of gravitational waves for the future Laser Interferometer Space Antenna…
Repeating Nuclear Transients as Candidate Electromagnetic Counterparts of LISA Extreme Mass Ratio Inspirals
Shubham Kejriwal, Vojtech Witzany, Michal Zajacek +2
Extreme-mass-ratio inspirals (EMRIs) are one of the primary targets for the recently adopted millihertz gravitational-wave (GW) observatory LISA. Some previous studies have argued…
A Case for a Binary Black Hole System Revealed via Quasi-Periodic Outflows
Dheeraj R. Pasham, Francesco Tombesi, Petra Sukova +33
Binaries containing a compact object orbiting a supermassive black hole are thought to be precursors of gravitational wave events, but their identification has been extremely chall…
Alive but Barely Kicking: News from 3+ years of Swift and XMM-Newton X-ray Monitoring of Quasi-Periodic Eruptions from eRO-QPE1
Dheeraj R. Pasham, Eric R. Coughlin, Michal Zajacek +11
Quasi-periodic Eruptions (QPEs) represent a novel class of extragalactic X-ray transients that are known to repeat at roughly regular intervals of a few hours to days. Their underl…
X-ray eruptions every 22 days from the nucleus of a nearby galaxy
Muryel Guolo, Dheeraj R. Pasham, Michal Zajaček +15
Galactic nuclei showing recurrent phases of activity and quiescence have recently been discovered, with recurrence times as short as a few hours to a day -- known as quasi-periodic…
Science with a small two-band UV-photometry mission III: Active Galactic Nuclei and nuclear transients
M. Zajaček, B. Czerny, V. K. Jaiswal +14
In this review (the third in the series focused on a small two-band UV-photometry mission), we assess possibilities for a small UV two-band photometry mission in studying accreting…
Stellar transits across a magnetized accretion torus as a mechanism for plasmoid ejection
Petra Suková, Michal Zajaček, Vojtěch Witzany +1
The close neighbourhood of a supermassive black hole contains not only the accreting gas and dust but also stellar-sized objects, such as late-type and early-type stars and compact…
Growth of resonances and chaos for a spinning test particle in the Schwarzschild background
Ondřej Zelenka, Georgios Lukes-Gerakopoulos, Vojtěch Witzany +1
Inspirals of stellar mass compact objects into supermassive black holes are known as extreme mass ratio inspirals. In the simplest approximation, the motion of the compact object i…
Probing the Nature of Black Holes: Deep in the mHz Gravitational-Wave Sky
Vishal Baibhav, Leor Barack, Emanuele Berti +26
Black holes are unique among astrophysical sources: they are the simplest macroscopic objects in the Universe, and they are extraordinary in terms of their ability to convert energ…
Hamiltonians and canonical coordinates for spinning particles in curved space-time
Vojtěch Witzany, Jan Steinhoff, Georgios Lukes-Gerakopoulos
The spin-curvature coupling as captured by the so-called Mathisson-Papapetrou-Dixon (MPD) equations is the leading order effect of the finite size of a rapidly rotating compact ast…
Conservation laws and evolution schemes in geodesic, hydrodynamic and magnetohydrodynamic flows
Charalampos Markakis, Kōji Uryū, Eric Gourgoulhon +4
Carter and Lichnerowicz have established that barotropic fluid flows are conformally geodesic and obey Hamilton's principle. This variational approach can accommodate neutral, or c…
Pseudo-Newtonian equations for evolution of particles and fluids in stationary space-times
Vojtech Witzany, Claus Laemmerzahl
Pseudo-Newtonian potentials are a tool often used in theoretical astrophysics to capture some key features of a black-hole space-time in a Newtonian framework. As a result, one can…