Research directions of the Research Centre for Theoretical Physics and Astrophysics

The Research Centre for Theoretical Physics and Astrophysics (RCTPA) was founded in 2013 year in Institute of Physics, Faculty of Philosophy and Science in Opava, Silesian University in Opava, in order to continue research activities opened in the years 2005–2011, under the Research advice Relativistic and Particle Physics and its Astrophysical Aplications, supported by the government of the Czech Republic.
In its research activities based on methods of theoretical physics, RCTPA is focused on theoretical aspects of relativistic astrophysics and cosmology, construction of analytical and numerical models of physical processes is combined strong gravitational and electromagnetic fields of compact objects, predictions of observational implications of these processes, and methods treating agreement of theoretical model predictions with the related observational data.

Activities of RCTPA were developed in the following regions of research

Test particles and test fields on background of black holes, superspinars and other exotic objects modeled in the framework of the Einstein gravity or alternative theories of gravitation.
Gravity theory combined with models of non-linear electrodynamics – regular black holes and no-horizon strong-gravity objects.
Accretion processes in the field of black holes and neutron stars and their observational aspects.
Models of internal structure of neutron stars.
Plasma around magnetized black holes and neutron stars or strange stars.
Complex accretion structures and related jets – particle, fluid, and magnetohydrodynamic models.
Dark energy and dark matter – influence on structure of galaxies and galaxy clusters.
Inhomogeneous cosmological models.
Chaos and regularity, non – linear methods of their treatment in theory and analysis of observational data.
Exect solutions of gravitational equations due to method of the minimal geometrical deformation and the gravitational decoupling.
Optical effects in strong gravitional fields – relation to te prepared cosmic missions.

Scientist of the RCTPA are continuously preparing, on a popular level, reports on the actual scientific results obtained in their research.

The Research Centre for Theoretical Physics and Astrophysics (RCTPA), established in 2013, was in the period 2014-2018 a part of the Albert Einstein Center for Gravitation and Astrophysics supported by the Czech Science Foundation excellence grant No. 14-37086G.

In the year 2019, in connection to preparations of establishing of Institute of Physics as part of the Silesian University in Opava, independent on the Faculty of Philosophy and Science, the research plan was modernized. Recent research activities of RCTPA are thus devoted mainly to multimessengers astrophysics, contentrating in theoretical studies (based on combined analytical and computational methods) in relativistic physics and astrophysics and their relations with particle physics, testing results of theoretical predictions in general relativity or alternative theories of gravity with observational data from processes occurring in strong gravity of compact objects in the Universe, and into participation on theoretical studies related to the preparation of X-ray satellite missions. At the present period, the studies are focused on the following research areas:

Influence of large-scale magnetic fields on physical processes in the vicinity of black holes, neutron stars and quark stars, naked singularities, superspinars or regular compact objects, wormholes;
Manifestation of alternative theories of gravity (branemodels, regular spacetimes, quintessential spacetimes) in physical processes taking place to vicinity of compact objects. Optical phenomena and quasinormal modes of gravitational waves;
Construction of accretion disk models in the framework of non-standard „dielectric“ perfect fluid toroidal configurations or configurations with matter governed by kinetic theory;
Models of 1D string loops reflecting tension of magnetic fields in accretion structures and their astrophysical application;
Influence of dark energy on accretion processes and their observational effects;
Models of observational (optical) effects generated by compact objects strong gravity;
Quantum gravity models;
Testing of quasiperiodic oscillation models on observation data from binary systems containing black holes and neutron stars or from surroundings of supermassive black holes;
Ringed accretion disk models;
General relativistic models of polytrophic configurations and their astrophysical applications;
Astrophysical processes in deformed Kerr metrics;
Physical processes around magnetic black holes;
Principle of minimal geometric deformation and generation of new exact solutions of Einstein’s equations of General theory of relativity.

Starting in 2020, the Research plan of the center is extended and actualized each year due to the scientific developments across the world, and as a reaction to relevant scientific results obtained in the center.

Extension and actualization for 2026

Particle motion in dipole magnetosphere of neutron stars immersed in an external asymptotically uniform magnetic field of a current loop.
Charged particle dynamics in dipole magnetosphere of black hole mimickers.
Slowly rotating neutron stars and black hole mimickers with dipole magnetospheres.
Ionized Keplerian disks around magnetized black holes and their mimickers, neutron stars, and superspinars.
Magnetic Penrose process accelerating charged particles in vicinity of magnetized rotating compact objects.
Radiative Penrose process in vicinity of magnetized rotating black holes and superspinars.
Magnetic fields influencing accretion disks in active galactic nuclei.
Gravitational lensing and optical phenomena related to active galactic nuclei (M87, SgrA*).
Data handling, processing and visualization of radiative transfer.
Radiative back-reaction and orbital widening around magnetized compact objects.
Spinning charged particles orbiting magnetized compact objects.
String loops oscillating around magnetized compact objects.
Magnetized plasma fluids.
Thermodynamics of black holes – black hole chemistry with cosmological constant.
Accretion processes around magnetized compact objects treated in the GRPIC Framework.
Accretion processes around magnetized compact objects treated in the GRRMHD Framework—related optical appearance.
Ringed accretion disks around black holes—collisions of tori and shell-jet formation, relation to the black hole shadow and the role of dark matter.
Astrophysical systems composed from self-gravitating particles GRMHD models of interacting tori and their optical appearance.
Non-linear methods in analysis of observational data from systems containing a compact object—related studies of chaos and regularity.
Polytropic spheres modeling dark matter halos with the influence of dark energy in galaxies and their clusters.
Trapping polytropes as models of exotic objects in the early Universe (LRD, etc.).
Optical appearance of modified KdS spacetimes.
Polarized radiation of accretion disks around magnetized compact objects.
Observational signatures of misaligned double-tori (ring) configurations orbiting black holes or superspinars.
Observational signatures of Kerr black holes endowed by a reflective firewall.
Rees-Sciama effect in Einstein-Strauss and Lemaitre-Tolman-Bondi models of the Universe.
Role of overtones in quasinormal oscillation of black holes and other compact objects in astrophysically relevant situations.
Dirty black holes – environmental effects and grey – body factors.
Regular black holes and dark matter halos.
Regular black holes and overtone outbursts.
Numerical high-accuracy WKB approximations.
Quasitrapped modes of massive scalar fields in asymptotically de Sitter spacetimes.
Hawking radiation and astrophysical signatures from black holes in alternative gravity.
Parameterization of the alternative models of gravity.
Physical processes around Proca black holes and compact objects Inflation and dynamical dark energy in modified gravity and comparison with observations.
Manifestly covariant quantum gravity and its consequences.
Quantum modifications of extremely compact objects.
Interior of regular black holes and the role of quantum effects.
Formation of black holes and appearance of singularities.
Singularity formation in collapsing axisymmetric configurations.
Dynamics of oscilons and kinks in scalar field theory.
Magnetic monopoles in wormhole spacetimes.

Extension and actualization for 2025

Influence of dark energy and dark matter on structure of galaxies and their clusters
Role of equation of state in equilibrium and oscillator states of string loops
Optical appearance of modified KdS spacetimes
Charged particles orbiting neutron stars in external magnetic field
Charged particle dynamics in vicinity of extremely compact objects with dipole magnetic field
Role of the Penrose process in acceleration of charged matter in vicinity of magnetized compact objects
Ionized Keplerian disks in strong gravomagnetics fields
Radiative back-reaction and orbital widening around magnetized compact objects
Ringed accretion disks around black holes immersed in dark matter halos
GRMHD models of interacting tori and their optical appearance
Non-linear methods in analysis of observational data from systems containing a compact object
Astrophysical processes around hairy black holes
Role of overtones in quasinormal oscillation of black holes and other compact objects
Parameterization of the alternative models of gravity
Quantum modifications of extremely compact objects
Braneworld models of compact objects
Thermodynamics of black holes
Black holes and the singularity theorem
Influence of dark energy on large-scale jets
Observational signatures of rotating wormholes, naked singularities and firewalls
Structure of static and stationary rotating white dwarfs in alternative theories of gravity and constraints of theory parameters from observations
Anizotropies of CMBR in alternative theories of gravity
Role of oscillons and Q-balls in cosmology and their dynamics
Greybody factors of black holes
Models of cosmic inflation

Extension and actualization for 2024

Optical phenomena related to KdS naked singularities
Dark matter halos as relativistic and non-relativistic polytropes influenced by vacuum dark energy
Vibrating string loops orbiting black holes and their relation to quasiperiodic oscillations observed in disks orbiting black holes
Accreting particles and structures in the dipole magnetosphere of black holes and neutron stars
Acceleration and observational aspects of extremely-high-energy particles in various spacetimes
Radiative back-reaction influencing ionized Keplerian disks orbiting black holes and neutron stars
Non-linear methods in the analysis of chaotic data from active galactic nuclei
GRMHD of simulation interacting tori orbiting black holes
Alternative models of gravity and parametrization of black holes
Quasinormal perturbative modes and overtones in various black hole and wormhole spacetimes – testing the event horizon geometry
Accurate Hawking radiation and grey – body factors
Hairy black holes
Black hole mimickers
Models of rotating gravastars

Extension and actualization for 2023

Ionized Keplerian disks around magnetized Schwarzschild black holes
Influence of the radiative back-reaction on the motion of particles orbiting magnetized black holes or neutron stars
Charged dielectric tori around magnetized black holes
Black hole model localized in 5D braneworld models
Inversion points of accretion flows around Kerr black holes and naked singularities and observational signatures of toroidal configuration
Vibrating string loops around black holes
Models of acoustic black holes
Analysis of the black-bounce Simpson – Visser spacetimes
Wormholes constructed by standard matter and their properties
Role of overtones in quasinormal modes of gravitational black hole perturbations
Properties of kinetic pressure tensors in magnetized fluids
Analytic expressions for quasinormal modes of black holes and wormholes

Extension and actualization for 2022

Optical phenomena in the field of wormholes.
Magnetized Kerr black holes – connection of chaos and regularity in the motion of charged test particles.
Properties of the Radiative Penrose process.
Testing alternative models of black holes due to comparison with observational data.
String loops oscillating around Kerr naked singularities.
Resonant switch model of quasiperiodic oscillation of radiation from disks orbiting neutron stars.
Relativistic polytropes as model of dark matter halos related to large galaxies and galaxy clusters.
Ringed accretion disks – inflow from counter – rotating tori.
Magnetohydrodynamic simulations of dynamics of ringed accretion disks.
Gravitational decoupling near Cauchy horizon.
Properties of exact modified Tolman VII model of neutron stars.

Extension and actualization for 2021

Magnetic Penrose proces – astrophysical consequences.
Test particles orbiting wormholes.
Epicyclic motion of spinning test particles around black holes.
Physical processes around supermassive black holes surrounded by dark matter.
Physical processes on the backround of parametrized black holes.
Optical effects in the field of black holes and wormholes.
Physical properties of the Tolman VII model of neutron stars.
Electromagnetic fields around rotating neutron stars.
Ringed accretion disks – inclined disks and their collisions with jets.
Force analysis of charged „dielectric“ tori.
Blandford – Znajek process around black holes governed by alternative theories of gravity.
Polytropes modelling of halos of dwarf galaxies.
Properties of the apparently covariant gravity.
Gravitational decoupling for axisymmetric and stationary spacetimes.

Extension and actualization for 2020

Accretion structures in strong gravomagnetic fields = particle, magnetohydrodynamic, „dielectric“ approaches
Ultra-high energy cosmic rays and radiation reaction process
Complex accretion and structures and related optical effects – relation to observed date from satellites
Chaos regularity and related nonlinear methods of treating data
Compact and extremely compact object, their stability and efficiency of null geodesics trapping, models of neutron stars
Thermodynamics of black holes in GR and alternative gravities
Dark matter halos and dark energy
Inflationary cosmological model
Inhomogeneous cosmological models