László Ábel Somlai (2016.04.01 - 2016.07.01)
Supervisor: Mátyás Vasúth
Publication: The effect of the cosmological constant on a quadrupole signal in the linearized approximation
Abstract: In the year 2015, the first observation of gravitational wave (GW150914) was detected by the LIGO-Virgo group. Its waveform emanating from the inward spiral and merger of a pair of black holes matched the predictions of general relativity. The continuous development of the detectors give the opportunity for detecting more subtle effects, of which one is the cosmological constant. It seems reasonable to determine the effect of it for the known waveforms in order to extend the number of the searched parameters.
János Endre Maróti (2016.04.01 - 2016.07.01)
Supervisor: Mátyás Vasúth
abstract: We can detect gravitational waves by binary systems only before the collision. The development of the detectors give opportunity of more subtle detections. Based on these binary systems' signal and these detectors' signal-to-noise ratio we can determine the binary systems' parameters that we can detect at a specific time before the collision.
Balázs Kacskovics (2016.04.01 - 2016.07.01)
Supervisor: Mátyás Vasúth
Abstract: The supermassive binary black hole system OJ 287 gives a unique possibility to examine gravitational effects to high accuracy. The quasiperiodic light variations of this object have been observed for more than one century. Based on the times of these outbursts the orbital elements and other parameters of the system were determined to high accuracy. Using recent assumptions on the spins of the components we study the effects of spin contributions to the orbit up to 3.5 PostNewtonian order.