Hae

Relativistic jets launched by supermassive black holes (SMBH) are some of the most extreme phenomena in the Universe. They are best observed in blazars, where the jet is pointing almost directly towards us. This unique ...

In this dissertation, active galactic nuclei (AGN) are discussed, as they are seen with the high-resolution radio-astronomical technique called Very Long Baseline Interferometry (VLBI). This observational technique provides ...

This thesis concentrates on the topological defects of spin-1 and spin-2 Bose-Einstein condensates, the ground states of spin-3 condensates, and the inert states of spinor condensates with arbitrary spin. Our work is based ...

Among all interesting astrophysical objects in the universe, only a few are capable of improving our understanding of physics under extreme conditions. Accreting neutronstars are one of these objects. These compact objects ...

This thesis discusses different aspects of time-dependent two-level quantum systems and their coherent dynamics. In the introductory chapters, we present some basic models used to study them and some basic results ...

Computational materials physics is a field where we try to understand the phenomena related to materials all around us. However we can only model a small sections portion of these materials in our computations, quantum ...

In this doctoral thesis, core-collapse supernova progenitor stars are studied. Different ways to gain information on the progenitor stars of core-collapse supernovae are explored, with an emphasis on using the environments ...

Porous silicon (PSi) is an interesting material and its use in various applications has been studied extensively. One such application is detecting humidity and gas under ambient conditions. Typically, ...

Quantum probing is a fairly wide topic deepening its roots into many fields as it can borrow tools from, and be applied to, many-body physics, open quantum systems theory, quantum information and quantum thermodynamics. ...

In this thesis mainly long quasi-periodic solar oscillations in various solar atmospheric structures are discussed, based on data obtained at several wavelengths, focussing, however, mainly on radio frequencies. Sunspot ...