News

• Proceedings of RAGtime 23-25 is now available for download here

Our Research

Research Centre for Computational Physics and Data Processing (Astrocomp) was established in 2013-2014 and it focuses on research in the area of complex modelling of astrophysical processes and observational data requiring complex linking of analytical and numerical methods. An emphasis is put on the development and utilization of advanced external as well as own software platforms benefiting from high power of currently available computers. Among the basic priorities of the Centre are interpretation of existing satellite and terrestrial observations of radiation of compact objects and participation in preparing future astrophysical satellite missions.

The Research centre is extending its activities since it has been founded in 2013 to follow the recent development in relevant research and important scientific results. Activities of the Centre closely follows rapid development of the High Performance Computing and utilization of supercomputers in scientific work. Since 2020 the Research Centre is a part of the Institute of Physics in Opava. The scientific results of the Centre are regularly published in peer-reviewed prestigious journals and presented at important international scientific conferences and meetings. The centre closely collaborates with scientist from well esteemed institutions from all around the world.

In parallel we also focus on applying the utilized methods in other areas of physics and applied physics, such as biophysics.

Research activities of Astrocomp are developed in the following areas of research:

• Study, modelling and visualisation of astrophysical processes in the vicinity of compact objects (black holes, neutron and strange stars), analysis of astrophysical data
• Modelling of the inner structure of compact objects and their equation of state
• Exploration of detailed influence of structure and induced spacetime of compact objects on their inner physical processes and processes in their vicinity
• Simulations of observed X-ray variability and spectra of accreting compact objects considering existing and future X-ray observatories
• Utilisation of advanced algorithms and hardware for parallel and accelerated computations and data processing
• Kaonium and dileptons production in e+e- annihilation data
• GRRMHD simulations of accretion processes in the vicinity of compact objects
• Processing of data from X-ray observatories and developing new X-ray cosmic missions

In 2019, in connection to preparation for establishing the Institute of Physics in Opava as an independent part of the Silesian University in Opava, activities of Astrocomp were extended in the area of computational astrophysics and numerical methods, and particle and experimental physics.

Starting in 2020 the research plan of the Centre is being extended and updated (actualised/modernised) every year in accordance with scientific developments across the world, and as a reaction to relevant scientific results obtained in the research Centre.

Selected Recent Publications

• KOUZIS Marios, RÓŻAŃSKA Agata, LANČOVÁ Debora, CZERNY Bożena, GRONKIEWICZ Dominik. A Magnetically Supported Disk─Corona Model for Changing-look Active Galactic Nuclei Transitions. The Astrophysical Journal Letters, Volume 1007, Issue 1, id.L6, 8 pp. (2026)
  [NASA ADS, PDF]
• ZDZIARSKI Andrzej A., MARCEL Grégoire, VELEDINA Alexandra, OLEJAK Aleksandra, LANČOVÁ Debora. Spins of Black Holes in X-ray Binaries and the Tension with the Gravitational Wave Measurements. New Astronomy Reviews, Volume 102, id.101746 (2026)
  [NASA ADS, PDF]
• LANČOVÁ Debora, WIELGUS Maciek, ABRAMOWICZ Marek, RÓŻAŃSKA Agata, KLUŹNIAK Włodek, HORÁK Jiří, ABARCA David, SĄDOWSKI Aleksander, TÖRÖK Gabriel. Radiative GRMHD simulations of puffy accretion discs: Numerical versus analytical models of sub-Eddington accretion. Monthly Notices of the Royal Astronomical Society, Volume 550, Issue 4, id.stag1278, 13 pp. (2026)
  [NASA ADS, PDF]
• ABRAMOWICZ Marek A., BRANDENBURG Axel, HORÁK Jiří, LANČOVÁ Debora, MILLER John C., SZUSZKIEWICZ Ewa, WIELGUS Maciek. Universal behaviour of α-viscosity in black hole accretion discs. eprint arXiv:2603.10997 (2026)
  [NASA ADS, PDF]
• BISWAS Parikshit P., RÓŻAŃSKA Agata, VINCENT Frederic H., LANČOVÁ Debora, ZYCKI Piotr T. Broad iron line as a relativistic reflection from warm corona in AGNs. Astronomy & Astrophysics, Volume 707, id.A156, 18 pp. (2026)
  [NASA ADS, PDF]
• TÖRÖK Gabriel, KLIMOVIČOVÁ Kateřina, LANČOVÁ Debora, MATUSZKOVÁ Monika, ŠRÁMKOVÁ Eva, URBANEC Martin, ČEMELJIĆ Miljenko, ŠPRŇA René, KARAS Vladimír. Modulation of X-Ray Flux by Obscuration of Neutron Star Boundary Layer. The Astrophysical Journal, Volume 981, Issue 1, id.10, 7 pp. (2025)
  [NASA ADS, PDF]
• ČEMELJIĆ Miljenko, KLUŹNIAK Włodek, MISHRA Ruchi, WIELGUS Maciek. Pseudo-Newtonian Simulation of a Thin Accretion Disk Around a Reissner–Nordström Naked Singularity. The Astrophysical Journal, Volume 981, Issue 1, id.69, 7 pp. (2025)
  [NASA ADS, PDF]
• MATUSZKOVÁ Monika, TÖRÖK Gabriel, KLIMOVIČOVÁ Kateřina, HORÁK Jiří, STRAUB Odele, ŠRÁMKOVÁ Eva, LANČOVÁ Debora, URBANEC Martin, URBANCOVÁ Gabriela, KARAS Vladimír. Accretion tori around rotating neutron stars — Paper II: Oscillations and precessions. Astronomy & Astrophysics, Volume 691, id.A168, 20 pp. (2024)
  [NASA ADS, PDF]
• MATUSZKOVÁ Monika, TÖRÖK Gabriel, LANČOVÁ Debora, KLIMOVIČOVÁ Kateřina, HORÁK Jiří, URBANEC Martin, ŠRÁMKOVÁ Eva, STRAUB Odele, URBANCOVÁ Gabriela, KARAS Vladimír. Accretion tori around rotating neutron stars — Paper I: Structure, shape and size. Astronomy & Astrophysics, Volume 691, id.A167, 7 pp. (2024)
  [NASA ADS, PDF]
• VIEIRA Ronaldo, MACIEK Wielgus. Particle motion around luminous neutron stars: Effects of deviation from Schwarzschild spacetime. Physical Review D, Volume 110, Issue 6, id.064010, 9 pp. (2024)
  [NASA ADS, PDF]
• YFANTIS Aristomenis, MOŚCIBRODZKA Monika, WIELGUS Maciek, VOS Jesse, JIMÉNEZ-ROSALES Alejandra. Fitting the light curves of Sagittarius A* with a hot-spot model. Bayesian modeling of QU loops in the millimeter band. Astronomy & Astrophysics, Volume 685, id.A142, 17 pp. (2024)
  [NASA ADS, PDF]
• VINKOVIĆ Dejan, ČEMELJIĆ Miljenko. Inner dusty regions of protoplanetary discs – III. The role of non-radial radiation pressure in dust dynamics. Monthly Notices of the Royal Astronomical Society, stae1635 (2024)
  [OUP, PDF]
• KAYANIKHOO Fatemeh, ČEMELJIĆ Miljenko, WIELGUS Maciek, KLUŹNIAK Włodek. Energy distribution and substructure formation in astrophysical MHD simulations. Monthly Notices of the Royal Astronomical Society, Volume 527, Issue 4, pp.10151-10167 (2024)
  [NASA ADS, PDF]
• KAYANIKHOO Fatemeh, ČEMELJIĆ Miljenko, WIELGUS Maciek, KLUŹNIAK Włodek. Energy dissipation in astrophysical simulations: results of the Orszag-Tang test problem. Proceedings of RAGtime 23-25 (2023)
  [PDF]
• KLIMOVIČOVÁ Kateřina, LANČOVÁ Debora, TÖRÖK Gabriel. Signal from neutron star obscured by oscillating accretion torus. Proceedings of RAGtime 23-25 (2023)
  [PDF]
• ČEMELJIĆ Miljenko, VARELA Jacobo. Aurora on pulsar planets. Proceedings of RAGtime 23-25 (2023)
  [PDF]
• KARAKONSTANTAKIS Angelos, LANČOVÁ Debora, ČEMELJIĆ Miljenko. General Relativistic Magnetohydrodynamic Simulations of Accreting Tori: Resolution Study. Proceedings of RAGtime 23-25 (2023)
  [PDF]
• KARAS Vladimír, KLIMOVIČOVÁ Kateřina, LANČOVÁ Debora, ŠTOLC Marcel, SVOBODA Jiří, TÖRÖK Gabriel, MATUSZKOVÁ Monika, ŠRÁMKOVÁ Eva, ŠPRŇA René, URBANEC Martin. Timing of accreting neutron stars with future X-ray instruments: towards new constraints on dense matter equation of state. Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 53, no. 4, p. 175-190. (2023)
  [NASA ADS, PDF]
• LICHARD Peter. New narrow resonance in the e⁺e^–→ϕ η data by the Belle collaboration. Physical Review D, Volume 108, Issue 9, article id.092005. (2023)
  [NASA ADS, PDF]
• MISHRA Ruchi, ČEMELJIĆ Miljenko, VARELA Jacobo, FALANGA Maurizio. Auroras on planets around pulsars. The Astrophysical Journal Letters, Volume 959, Issue 1, id.L13, 6 pp. (2023)
  [NASA ADS, PDF]
• ČEMELJIĆ Miljenko, BRUN Allan Sacha. Trends in torques acting on the star during a star-disk magnetospheric interaction. Astronomy & Astrophysics, Volume 679, id.A16, 14 pp. (2023)
  [NASA ADS, PDF]
• ČEMELJIĆ Miljenko, KLUŹNIAK Włodek, PARTHASARATHY Varadarajan. Magnetically threaded accretion disks in resistive magnetohydrodynamic simulations and asymptotic expansion. Astronomy & Astrophysics, Volume 678, id.A57, 16 pp. (2023)
  [NASA ADS, PDF]
• MISHRA Ruchi, ČEMELJIĆ Miljenko, KLUŹNIAK Włodek. Accretion disc backflow in resistive MHD simulations. Monthly Notices of the Royal Astronomical Society, Volume 523, Issue 3, pp.4708-4719 (2023)
  [NASA ADS, PDF]
• VIEIRA Ronaldo S. S., KLUŹNIAK Włodek. Astrophysical cloaking of a naked singularity. Monthly Notices of the Royal Astronomical Society, Volume 523, Issue 3, pp.4615-4623 (2023)
  [NASA ADS, PDF]
• KAYANIKHOO Fatemeh, KAPUSTA Mateusz, ČEMELJIĆ Miljenko. The maximum mass and deformation of rotating strange quark stars with strong magnetic fields. eprint arXiv:2305.03055 (2023)
  [NASA ADS, PDF]
• BAKALA Pavel, BAKALOVÁ Alena, LA PLACA Riccardo, FALANGA Maurizio, STELLA Luigi. Extreme amplification regimes of the Schwarzschild gravitational lens. Astronomy & Astrophysics, Volume 673, id.A164, 13 pp. (2023)
  [NASA ADS, PDF]
• MOSALLANEZHAD Amin, Bu De-Fu, ČEMELJIĆ Miljenko, ZERAATGARI Fatemeh Zahra, HAI Yang, MEI Liquan. Numerical Simulation of Hot Accretion Flow around Bondi Radius. The Astrophysical Journal, Volume 939, Issue 1, id.12, 12 pp. (2022)
  [NASA ADS, PDF]
• VRBA Jaroslav, URBANEC Martin, STUCHLÍK Zdeněk, MILLER John C. Trapping of null geodesics in slowly rotating spacetimes. The European Physical Journal C, Volume 80, Issue 11 (2022).
  [NASA ADS, PDF]
• LANČOVÁ Debora, YILMAZ Anastasiya, WIELGUS Maciek, DOVČIAK Michal, STRAUB Odele, TÖRÖK Gabriel. Spectra of Puffy Accretion Discs: the kynbb Fit. submitted to the AN as proceedings of XMM-Newton 2022 Science Workshop (2022).
  [arXiv, PDF]
• ABRAMOWICZ Marek, BEJGER Michał, UDALSKI Andrzej, WIELGUS Maciek. A Robust Test of the Existence of Primordial Black Holes in Galactic Dark Matter Halos. The Astrophysical Journal Letters, Volume 935, Number 2 (2022).
  [IOP, PDF]
• WIELGUS Maciek, LANČOVÁ Debora, STRAUB Odele, KLUŹNIAK Włodek, NARAYAN Ramesh, ABARCA David, RÓŻAŃSKA Agata, VINCENT Frederic, TÖRÖK Gabriel, ABRAMOWICZ Marek A. Observational properties of puffy disks: radiative GRMHD spectra of mildly sub-Eddington accretion. Monthly Notices of the Royal Astronomical Society, stac1317 (2022).
  [NASA ADS, PDF]
• TÖRÖK Gabriel, KOTRLOVÁ Andrea, MATUSZKOVÁ Monika, KLIMOVIČOVÁ Kateřina, LANČOVÁ Debora, URBANCOVÁ Gabriela, ŠRÁMKOVÁ Eva. Simple analytic formula relating the mass and spin of accreting compact objects to their rapid X-ray variability. The Astrophysical Journal, Volume 929, Number 1 (2022).
  [NASA ADS, PDF]

Older publication are available here.