Mathematisch-Naturwissenschaftliche Fakultät: Suche
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X-Ray Studies of Galaxy Clusters and Groups: Gas Properties in the Exceptional Cases of Faint Outskirts, High Redshift and a Merging Event
(2018-01-26)
The history and evolution of the universe, the understanding of the formation of structures and the investigation of a wealth of astrophysical phenomena are the topical subjects in present-day galaxy cluster physics and ......
2-D Anisotropic Inversion of Frequency-Domain Induced Polarization Data
(2018-03-23)
Measured data in IP (time or frequency domain) are usually interpreted with inversion algorithms, which may be based on stochastic or iterative schemes for finding an optimal data-associated model of the subsurface. Despite ...
A New Continuous 4π-Frozen-Spin-Target for the Crystal Barrel Experiment
(2018-01-29)
The CBELSA/TAPS experiment has produced a large amount of data on photo-production reactions in double polarization reactions. For this a frozen-spin target has been used, which consists of a horizontal dilution refrigerator ......
Phenomenology of Dark Matter Annihilations in the Sun
(2018-03-05)
The annihilation of dark matter (DM) particles accumulated in the Sun could produce a flux of neutrinos, which is potentially detectable with neutrino detectors/telescopes and the DM elastic scattering cross section can ...
Magnetic Quantum Walks of Neutral Atoms in Optical Lattices
(2018-09-17)
This thesis focuses on the simulation of the physics of a charged particle under an external magnetic field by using discrete-time quantum walks of a spin-1/2 particle in a two-dimensional lattice. By Floquet-engineering ...
Effective actions from string and M-theory: compactifications on G2-manifolds and dark matter in the KL moduli stabilization scenario
(2018-09-26)
In this thesis we study the emergence of four-dimensional effective actions from compactifications of higher-dimensional string/M-theory and explore some of their phenomenological implications.
In order to compactify ......
In order to compactify ......
Generation of dark matter in the early universe from BSM models
(2018-10-11)
For several decades the nature of Dark Matter (DM) has been elusive to physics. Explanations for its evidences have been stacked up and most of them require new particle physics. In this work, we explore the standard thermal ...
Production of Dark Matter in Cosmological Models with Low Reheating Temperature
(2018-10-23)
In standard cosmology it is assumed that dark matter (DM) is thermally produced during the radiation dominated era after an inflationary period. This has led to the prediction of weakly interactive massive particles (WIMPs) ...
An Investigation of Constraints on Dark Matter Models from Mono-jet Searches at LHC
(2018-10-31)
In this work we investigate the Weakly Interacting Massive Particle (WIMP) dark matter searches in colliders. We focus on the mono-jet searches and derive the upper bounds on the WIMP production cross-sections at the LHC. ...
Bestimmung der Doppelpolarisationsobservablen E in der Reaktion γ⃗p⃗ → pη am CBELSA/TAPS-Experiment in Bonn
(2019-03-07)
Photoproduktionsdaten beeinflussen zunehmend unser Bild der tatsächlich in der Natur existierenden Baryon-Resonanzen. Die Analyse von (Polarisations-)Observablen ist entscheidend für die Extraktion von Resonanzen aus diesen ......