Publications

You will find my most recent publications by searching on ArXiv, InspireHEP, or Google Scholar.

The list below is updated to May 2026. Only published peer-reviewed works are included in reverse chronological order; conference proceedings and preprints are omitted.

  • Polcar, L. & Witzany, V. (2025).
    Toward relativistic inspirals into black holes surrounded by matter.
    Phys. Rev. D, 112(10), 104003. arXiv:2507.15720
    Relativistic treatment of orbital dynamics and gravitational-wave driven inspirals near a black hole embedded in an axisymmetric matter distribution.

  • Skoupý, V., Piovano, G. A. & Witzany, V. (2025).
    Spherical inspirals of spinning bodies into Kerr black holes.
    Phys. Rev. D, 112(12), 124054. arXiv:2506.20726
    Self-force driven inspirals of spinning compact objects on spherical orbits around a Kerr black hole, including spin–orbit effects on the gravitational waveforms.

  • Skoupý, V. & Witzany, V. (2025).
    Analytic solution for the motion of spinning particles in Kerr spacetime.
    Phys. Rev. Lett., 134(17), 171401. arXiv:2411.16855
    Closed-form integral solution for the trajectories of spinning test bodies in the full Kerr metric.

  • Witzany, V., Skoupý, V., Stein, L. C. & Tanay, S. (2025).
    Actions of spinning compact binaries: Spinning particle in Kerr matched to dynamics at 1.5 post-Newtonian order.
    Phys. Rev. D, 111(4), 044032. arXiv:2411.09742
    Action-angle framework for spinning binaries connecting the strong-field Kerr regime to the weak-field post-Newtonian expansion at 1.5PN order.

  • Piovano, G. A., Pantelidou, C., Mac Uilliam, J. & Witzany, V. (2025).
    Spinning particles near Kerr black holes: Orbits and gravitational-wave fluxes through the Hamilton-Jacobi formalism.
    Phys. Rev. D, 111(4), 044009. arXiv:2410.05769
    Hamilton-Jacobi treatment of spinning test-body orbits in Kerr, including first-order-in-spin gravitational-wave fluxes via the Teukolsky equation.

  • Afshordi, N., et al. (LISA Consortium Waveform Working Group, incl. Witzany, V.) (2025).
    Waveform modelling for the Laser Interferometer Space Antenna.
    Living Rev. Relativ., 28(1), 9. arXiv:2311.01300
    Comprehensive living review of all gravitational-waveform models needed for the LISA space-based detector.

  • Skoupý, V. & Witzany, V. (2024).
    Post-Newtonian expansions of extreme mass ratio inspirals of spinning bodies into Schwarzschild black holes.
    Phys. Rev. D, 110(8), 084061. arXiv:2406.14291
    Systematic post-Newtonian expansion of spinning-body EMRI dynamics in Schwarzschild.

  • Lynch, P., Witzany, V., van de Meent, M. & Warburton, N. (2024).
    Fast inspirals and the treatment of orbital resonances.
    Class. Quantum Grav., 41(22), 225002. arXiv:2405.21072
    Efficient adiabatic inspiral models that properly handle transient orbital resonances leaving observable imprints on LISA waveforms.

  • Kejriwal, S., Witzany, V., Zajacek, M., Pasham, D. R. & Chua, A. J. K. (2024).
    Repeating nuclear transients as candidate electromagnetic counterparts of LISA extreme mass ratio inspirals.
    Mon. Not. Roy. Astron. Soc., 532(2), 2143–2158. arXiv:2404.00941
    Statistical analysis of whether quasi-periodic nuclear X-ray eruptions could serve as electromagnetic counterparts of EMRI gravitational-wave events detectable by LISA.

  • Pasham, D. R., et al. (36 authors including Witzany, V.) (2024).
    A case for a binary black hole system revealed via quasi-periodic outflows.
    Science Advances, 10(13), eadj8898. arXiv:2402.10140
    Observations of X-ray flux from a galactic center apparently occluded by its outflow; possible interpretation as an intermediate-mass-ratio binary of two black holes.

  • Pasham, D. R., Coughlin, E. R., Zajacek, M., et al. (incl. Witzany, V.) (2024).
    Alive but Barely Kicking: News from 3+ years of Swift and XMM-Newton X-ray Monitoring of Quasi-Periodic Eruptions from eRO-QPE1.
    Astrophys. J. Lett., 963(2), L47. arXiv:2402.09690
    Follow-up observations of QPEs in an active galactic nucleus over more than 3 years.

  • Guolo, M., Pasham, D. R., Zajaček, M., et al. (incl. Witzany, V.) (2024).
    X-ray eruptions every 22 days from the nucleus of a nearby galaxy.
    Nature Astronomy, 8(3), 347–358. arXiv:2309.03011
    Observation and interpretation of a repeating X-ray eruption from a nearby galactic nucleus.

  • Witzany, V. & Piovano, G. A. (2024).
    Analytic solutions for the motion of spinning particles near spherically symmetric black holes and exotic compact objects.
    Phys. Rev. Lett., 132(17), 171401. arXiv:2308.00021
    Separation of variables and integral formulas for spinning test particles in any static spherically symmetric metric.

  • Zajaček, M., Czerny, B., Jaiswal, V. K., et al. (incl. Witzany, V.) (2023).
    Science with a small two-band UV-photometry mission III: Active Galactic Nuclei and nuclear transients.
    Space Sci. Rev., 220(3), 29. arXiv:2306.15082
    Science white paper for the Czech space-based UV telescope QUVIK.

  • Polcar, L., Lukes-Gerakopoulos, G. & Witzany, V. (2022).
    Extreme mass ratio inspirals into black holes surrounded by matter.
    Phys. Rev. D, 106(4), 044069. arXiv:2205.08516
    Orbital dynamics near a Schwarzschild black hole surrounded by an axisymmetric matter distribution, solved by canonical perturbation theory.

  • Lukes-Gerakopoulos, G. & Witzany, V. (2021).
    Nonlinear Effects in EMRI Dynamics and Their Imprints on Gravitational Waves.
    In Handbook of Gravitational Wave Astronomy, Springer, Singapore. arXiv:2103.06724
    Book chapter on non-linear orbital resonance transitions during gravitational-wave inspirals.

  • Suková, P., Zajaček, M., Witzany, V. & Karas, V. (2021).
    Stellar transits across a magnetized accretion torus as a mechanism for plasmoid ejection.
    Astrophys. J., 917, 43. arXiv:2102.08135
    Simulations of an object transiting a black hole accretion disk; the passages cause disk flickering and matter ejection along the spin axis.

  • Cardoso, V., Witzany, V., et al. (20 authors) (2021).
    Probing the nature of black holes: deep in the mHz gravitational-wave sky.
    Exp. Astron., 51, 1385–1416. arXiv:1908.11390
    ESA Voyage 2050 white paper describing the science case for a next-generation space-based gravitational-wave detector.

  • Zelenka, O., Lukes-Gerakopoulos, G., Witzany, V. & Kopáček, O. (2020).
    Growth of resonances and chaos for a spinning test particle in the Schwarzschild background.
    Phys. Rev. D, 101(2), 024037. arXiv:1911.00414
    Numerical analysis of chaos in spinning-body orbits near a non-rotating black hole; implies chaotic modelling is not needed for LISA EMRIs.

  • Witzany, V. (2019).
    Hamilton-Jacobi equation for spinning particles near black holes.
    Phys. Rev. D, 100, 104030. arXiv:1903.03651
    Spinning-body motion near a black hole recast in a new mathematical framework and analytically solved.

  • Witzany, V., Steinhoff, J. & Lukes-Gerakopoulos, G. (2019).
    Hamiltonians and canonical coordinates for spinning particles in curved space-time.
    Class. Quantum Grav., 36, 075003. arXiv:1808.06582
    Improved Hamiltonian framework for spinning bodies in strong gravitational fields with an efficient numerical evolution scheme.

  • Witzany, V. & Jefremow, P. (2018).
    New closed analytical solutions for geometrically thick fluid tori around black holes: Numerical evolution and the onset of the magneto-rotational instability.
    Astron. Astrophys., 614, A75. arXiv:1711.09241
    New idealized accretion disk solutions for use as simulation initial data.

  • Witzany, V. (2017).
    Exploiting the hidden symmetry of spinning black holes: conservation laws and numerical tests.
    Mon. Not. Roy. Astron. Soc., 473(2), 2434–2440. arXiv:1709.03330
    Conservation laws for matter near black holes, useful for testing astrophysical simulations.

  • Markakis, C., Uryu, K., Gourgoulhon, E., Nicolas, J.-P., Andersson, N., Pouri, A. & Witzany, V. (2017).
    Conservation laws and evolution schemes in geodesic, hydrodynamic, and magnetohydrodynamic flows.
    Phys. Rev. D, 96(6), 064019. arXiv:1612.09308
    Simplified derivations of conservation laws for magnetised plasmas in strong gravitational fields.

  • Witzany, V. & Lämmerzahl, C. (2017).
    Pseudo-Newtonian Equations for Evolution of Particles and Fluids in Stationary Space-times.
    Astrophys. J., 841, 105. arXiv:1601.01034
    Effective scheme for evolving accretion flows near black holes within existing Newtonian simulation codes.

  • Witzany, V., Semerák, O. & Suková, P. (2015).
    Free motion around black holes with discs or rings: between integrability and chaos–IV.
    Mon. Not. Roy. Astron. Soc., 451(2), 1770–1794. arXiv:1503.09077
    Study of gravitational perturbations on the motion of bodies near black holes; comparison with effective Newtonian models.