Books

Nach ihrer Erschaffung genießt Nelly, das astrophysikalische Neutrino, alles, was sie im Universum sieht. Doch der Weltraum kann einsam sein [...]

Compact high-brightness electron beam sources are advantageous for industrial, medicaland scientific applications. Laser-plasma acceleration has the potential to meet thisneed, as it can provide acceleration fields that are orders of magnitude higher than inclassical linear accelerators based on modern radio-frequency technology, allowing formuch smaller accelerators. [...]

This thesis investigates the optimization of a Transition-Edge Sensor (TES) for the Any Light Particle Search II (ALPS II) experiment. The ALPS II experiment searches for axions and axion-like particles, which are predicted by several beyond-standard model theories and are good candidates for dark matter. [...]

There is an ever-increasing demand for structural metals with higher strength. Metals can be strengthened by reducing grain size in their microstructure, but ductility is also concomitantly reduced. [...]

Double parton scattering (DPS) is a mechanism in which two hard parton-levelprocesses take place in a single hadron-hadron collision. This can yield importantcontributions to search processes at the LHC, a prominent channel being like-sign leptonpair production via the production of two W bosons of equal charge in a double Drell-Yan process.The factorization theorems allow to write the DPDs cross-section in terms ofperturbatively computable hard scattering part, and non-perturbative objects calleddouble parton distributions (DPDs), which contain a lot of new information abouthadron structure at the quantum level, such as correlations between partons inpolarization, color, and momentum.In this thesis, we describe transverse-momentum dependence in the process ofproduction of two W bosons in proton-proton collision via double parton scattering.This requires so-called transverse momentum-dependent double parton distributions(DTMDs). [...]

Gravitational waves have recently emerged as a novel messenger inastronomy, providing profound insights into the evolution of the cosmos:Last year, several pulsar timing arrays (PTAs) announced the detectionof a gravitational wave background (GWB) at nHz frequencies, markinga significant milestone in this field. This discovery can be interpretedas a signal emitted by the inspiral of supermassive black holes duringhierarchical structure formation. [...]

The lack of signals in traditional dark matter (DM) searches beyond gravitational interactions provide an excellent reason to investigate weakly coupled and/or light dark sectors(DS). These receive motivation both from the theoretical and the phenomenological side with rich physics across many different scales. [...]