Research directions of the Research Centre for Theoretical Physics and Astrophysics

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 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 on methods treating agreement of theoretical models 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 structure 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 accross the world, and as a reaction on relevant scientific results obtained in the center.

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