|Research Project GAČR 209/12/P740|
High Frequency Quasi-periodic Oscillations and Compact Object Properties: Theory vs. Observation
Recent developments of the X-ray space observatories bring precise data from strong gravity fields in the vicinity of black holes and neutron or strange stars (compact objects). Among the important related phenomena are the high-frequency quasi-periodic oscillations (QPOs) that most likely originate in accretion discs surrounding these objects. Understanding the origin and other properties of QPOs represents a promising way to explore strong gravity as well as the elementary particle physics which determines the internal structure of neutron stars. Variety of QPO models has been proposed, but there is yet no consensus on their relevance. Within the project we would like to contribute to this important open problem in the areas of both, comparison of observational data with theoretical models, and development of the individual QPO models. We will especially focus on estimating the compact object parameters and developing those models that deal with accretion disc oscillations. In relation to these goals we will investigate the impact of different equations of state on the astronomical phenomena in the vicinity of neutron stars and study resonant and other behaviour of diverse accretion disc oscillation modes.