Ph.D. Theses

This dissertation investigates three well-motivated scalar extensions of the Standard Model and shows that the combination of constraints from collider experiments, from the evolution of the early Universe, and from future astrophysical experiments, such as GW interferometers, will be very valuable for probing the parameter space of those models.In particular, extensions of the Higgs sector of the Standard Model allow for a rich cosmological history around the electroweak scale. In the two-Higgs-doublet model (2HDM) and its real singlet extension (the N2HDM), we determine the parameter regions featuring a first-order EW phase transition (FOEWPT), but also the regions where other effects occur such as electroweak symmetry non-restoration (SnR) at high temperature [...]

In this thesis, data collected by the CMS Experiment at the CERN LHC is analysed. The data was collected during LHC Run 2 in the years 2016-2018 and corresponds to an integrated luminosity of 138 $\textrm{fb}^{-1}$. [...]

This doctoral thesis is devoted to investigation of self-assemblies based on hy-drophilic polymers (both homopolymers and block copolymers) in aqueous media.Specifically, we focused on two classes of systems: (i) hydrophilic polymers whoseself-assembly in aqueous solutions is driven by association of terminal hydrophobicgroups and (ii) double hydrophilic block polyelectrolytes whose self-assembly oc-curs via electrostatic complexation of polyelectrolyte blocks. For characterization offormed assemblies, we mostly used different scattering techniques (light scattering,small-angle X-ray scattering) in a combination with a number of supplementarymethods including microscopy, fluorometry and calorimetry.Keywords: hydrophilic polymers, block copolymers, association, self-assembly,micelles, scattering

Intrinsically disordered peptide amphiphiles (IDPAs) are a novel class of molecules with great potentialif incorporated into nanocarriers. IDPAs combine hydrocarbon chains that originate fromnatural lipids and polypeptide chains composed of sequences that do not fold into a static structurebut remain intrinsically disordered, fluctuating between various conformations. [...]

Currently, the technique to detect neutrinos at the EeV energy scale by the radio signals emitted when they interact in glacial ice, is making the transition from smallprototype experiments to full discovery-scale detectors. In the summer of 2021, construction started for the Radio Neutrino Observatory Greenland (RNO-G), the firstdetector large enough to be sensitive to the expected flux of cosmogenic neutrinos. [...]

Neutrinos in the ultra-high energy regime are expected, either from astrophysical or cosmogenic origin. Due to the steeply falling neutrino flux for high energies, the currently largest neutrino detector has only observed neutrinos up to PeV energies [...]

High energy physics experiments are performed at the Large Hadron Collider (LHC) at CERN colliding bunches of protons at energies up to 13TeV. A fundamental input for any physics study at the LHC is the knowledge of the proton structure in high energy collisions. [...]

Most scientific research on the topic of atomic diffusion in glasses is either based on theoretical work or computer simulations. Few experimental data are available due to the methods being either macroscopic, like tracer diffusion measurements, or probe time-scales too fast to study atomic transport in solids. [...]

The naturalness problem of the Standard Model (SM) challenges our understanding of the origin of mass. Several theories have been proposed to tackle the problem, one of them is the Composite Higgs Model (CHM) where the Higgs boson of the SM is not an elementary scalar but instead a composite object bound at a confinement scale of a TeV. [...]