Research

Research Group: The Stellar Populations and Dynamics Research Group (SPODYR)

Advisor:  Dr. Pavel Kroupa, University of Bonn

This project investigates the phenomenon of mass segregation—the tendency of more massive stars to migrate toward the center of a star cluster under the frameworks of both Newtonian gravity and Milgromian dynamics (MOND). Using detailed N-body simulations, we aim to compare the onset, rate, and structural consequences of mass segregation in stellar systems governed by these two gravitational theories. A particular focus is placed on exploring the end products of dynamical evolution, such as the formation and stability of multiple star systems, and how these outcomes differ between Newtonian and Milgromian regimes. This research contributes to broader efforts to test gravity at galactic and sub-galactic scales and is conducted within the Stellar Populations and Dynamics Research Group (SPODYR).

Research Group: New Physics working group, NANOGrav 

This project focuses on reconstructing the stochastic gravitational wave background (GWB) signal detected in the NANOGrav 15-year dataset by modeling the spectrum using piecewise power laws. The objective is to capture possible deviations from a simple power-law behavior, which may arise due to contributions from various astrophysical and cosmological sources—such as supermassive black hole binaries, cosmic strings, or processes in the early universe like inflation and phase transitions. By applying this flexible parametrization to the spectral shape of the GWB, we aim to identify and characterize features that could point to new physics beyond standard astrophysical expectations. This work is carried out within the New Physics Group of the NANOGrav collaboration.