Ph.D. Theses

We extend the study of black hole superradiance in binary systems, also known as gravitational atomic physics, to include eccentric and inclined orbits. Such systems exhibit Landau-Zener-like transitions between bound states of the bosonic cloud. [...]

Searches for physics beyond the Standard Model can be pursued through high-precision measurements of atomic systems that are sensitive to variations in fundamental constants. In this thesis, highly charged ions (HCI) are investigated as promising candidates for optical clocks to probe new physics. [...]

The increasing demands on spatial resolution and beam stability in next-generation synchrotron sources such as PETRA~IV necessitate advanced techniques for wavefront characterization and coherence analysis. This thesis presents a comprehensive framework for quantitative wavefront reconstruction and coherence measurement, developed with in-house computational tools optimized for synchrotron beamlines. [...]

Future high energy physics aims to probe the Standard Model with unprecedented precision, through upgrades of existing collider experiments and the development of future collider facilities. Achieving the ambitious physics goals requires detector instrumentation with a performance beyond the current state of the art. [...]

The structure and dynamics of four different colloidal systems are investigated usingcoherent X-ray scattering methods. The static structure of the samples is studied us-ing Small Angle X-ray Scattering (SAXS), while the dynamics are probed using X-rayPhoton Correlation Spectroscopy (XPCS). [...]

This thesis investigates loop integrands of correlation functions of scalar half-BPS operators in four-dimensional $\mathcal{N}=4$ supersymmetric Yang–Mills (SYM) theory. $\mathcal{N}=4$ SYM provides a central “theoretical laboratory” due to its high degree of symmetry, its role in the AdS/CFT correspondence, and the emergence of integrability in the planar limit.First, we study planar higher-point generating functions, which combine infinitely many fixed-charge correlators into unified expressions using ten-dimensional coordinates that merge spacetime and R-symmetry variables. [...]

Das Standardmodell beschreibt erfolgreich die bekannten Elementarteilchen und ihre Wechselwirkungen, dennoch bleiben Fragen offen. Hierzu zählt die Teilchennatur der Dunklen Materie, ein Phänomen, das auf Physik jenseits des Standardmodells (BSM) hinweist. [...]

Studying the morphology of lyotropic liquid crystals formed by compositions of phospholipids and artificial azobenzene amphiphiles with in situ small angle X-ray scattering identified their shapes and mesophases and light-induced mesophase transitions from a lamellar to a cubic mesophase were revealed. The formation and transition between cubic mesophases are of high interest for designing drug delivery systems and to study membrane properties during membrane fusions [...]

In this thesis, a novel method of multijet background estimation in pp collisions in environments sensitive to high pileup activity is introduced. The methodology and developmentof the method is discussed in the context of searches for invisible Higgs boson decays with vector boson fusion signature using the ATLAS detector [...]

The nature of the electroweak phase transition (EWPT) in the early Universe plays acentral role in connecting particle physics with cosmology. In the Standard Model (SM),the EWPT is a smooth crossover, forbidding electroweak baryogenesis and yielding noobservable gravitational-wave (GW) signal. [...]