### Scientific outlook for the year 2017

In the year 2017, we plan to continue our investigation of the astrophysical phenomena occurring around black holes and magnetic neutron stars and related spacetimes focusing on the following problems:

- non-geodetical photon motion in non-linear electrodynamics regime,
- extension of the research in the field of quasi-normal modes of black holes on the brane to the case of rotating black holes,
- investigation of optical phenomena regarding double-tori structures with intention to find the traces that will clearly distinguish those structures from the ordinary toroidal structures,
- discussion of the particular case of a double tori orbiting a central Kerr attractor, considering possible tori collision and consequent collisional energy release,
- study of attractors characterized by presence of ringed accretion discs (providing indication for possible environment where an evidence of such objects may be found),
- observational evidence of ringed accretion discs through the optical effects of radiating accretion ringed discs,
- survey of evolutionary schemes of the ringed accretion discs,
- observationally relevant effects (oscillatory frequencies) of charged particle motion in the vicinity of a black hole immersed into dipole magnetic field,
- dynamics of electrically charged string loops in the field of electrically charged black hole,
- investigation of charged fluid structures in terms of the fitting of the model and matter parameters so that they lead to the astrophysically relevant configurations encircling magnetic star,
- improvement of the model of circling charged fluid considering the viscosity of the fluid or the internal electrostatic repulsion,
- looking for interesting configurations of charged fluid in more complex backgrounds than considered up to now (inclusion of rotation of spacetimes or ambient magnetic fields), which will naturally enhance the possibility to construct unique structures within more realistic physical scenarios,
- resonance switch model of high-frequency quasiperiodic oscillations in the binary systems containing neutron stars, using the Hartle-Thorne model of rotating neutron stars,
- application of the study of general relativistic polytropic configurations with the observationally restricted repulsive cosmological constant to model cold dark matter halos of large galaxies and galaxy cluster, or in the inverse case of the dwarf galaxies,
- application of the polytropic configurations to model neutron stars containing regions of trapped null geodesics that could be relevant both for the cooling of neutron stars and the effect on their structure, and in trapping of gravitational waves in their interior.