Ph.D. Theses

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2025-05-20
13:59
[PUBDB-2025-01709] Dissertation / PhD Thesis
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THE HIGGS BRANCH OF SIX DIMENSIONAL SUPERSYMMETRIC THEORIES:MAGNETIC QUIVERS, GEOMETRY, AND HASSE DIAGRAMS
217 pp. () = Dissertation, University of Hamburg, 2025  GO
In this thesis, we report recent advancements in the understanding of Higgs branch moduli spacesof six-dimensional (1,0) supersymmetric quantum field theories, along with related developments.These progresses have been achieved by exploiting the interplay between geometrical engineeringand techniques in quiver gauge theories, leading to new insights into the Higgs mechanism’s actionin higher-dimensional supersymmetric theories.Paper I: We present an extension of the magnetic quiver technique to a class of non-gravitationalsupersymmetric quantum field theories in six dimensions known as Little String Theories (LSTs).These theories also exhibit a higher-group symmetry structure. Notably, we prove a monotonicitytheorem describing the evolution of κR, a quantity characterizing the higher group symmetry, underpartial Higgsing patterns.Paper II: Specializing to a brane engineering framework, we construct a family of LST modelswith a natural interpretation as an F-theory compactification. [...]
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2025-05-12
14:27
[PUBDB-2025-01600] Dissertation / PhD Thesis
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Studies on Inclusive $|V_{ub}|$:A Measurement of $|V_{ub}|/|V_{cb}|$ at the Belle Experiment and A Search for the Weak Annihilation Contribution to Charmless Semileptonic $B$ Decays at the \belletwo Experiment
280 pp. () = Dissertation, University of Hamburg, University of Melbourne, 2025  GO
Two analyses related to the inclusive determination of the magnitude of the Cabbibo-Kobayashi-Maskawa matrix element $|V_{ub}|$ are presented. The first analysis presents the first measurement of the ratio of partial branching fractions of the inclusive charmless, $\overline{B} \to X_u \ell \overline{\nu}$, to the inclusive charmed, $\overline{B} \to X_c \ell \overline{\nu}$, semileptonic $B$ decay, where $\ell$ represents an electron or muon, and $X$ a hadronic system. [...]
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2025-05-09
14:21
OpenAccess [PUBDB-2025-01590] Book/Dissertation / PhD Thesis
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Statistical optics methods for generating, simulating, and characterising emission from relativistic electron beams
[DESY-THESIS-2025-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 172 pp. () [10.3204/PUBDB-2025-01590] = Dissertation, Universität Hamburg, 2025  GO
Synchrotron radiation sources and free-electron lasers have revolutionised the study of matter and biological systems by providing unique combinations of radiation pulse characteristics. Although these two types of facilities differ fundamentally in terms of pulses time scales, coherence properties, and (peak) brilliance, each offers an exceptional mix of these features. [...]
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2025-05-09
12:00
OpenAccess [PUBDB-2025-01583] Dissertation / PhD Thesis
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Intermolekulare Energie- und Ladungstransferprozesse in photoinduzierten anorganischen Ionen und biorelevanten Molekülen in wässriger Umgebung
KOBRA Universität Kassel 142 pp. () [10.17170/KOBRA-2025020610893] = Dissertation, University of Kassel, 2024  GO
Die Untersuchung der Wechselwirkung von Röntgenstrahlen mit biorelevanter Materie ist ein anhaltendes und weitverbreitetes Forschungsfeld. Obwohl die makroskopischen Folgen dieser Wechselwirkung bereits weitgehend verstanden sind, ist unser Verständnis der Prozesse auf molekularer Ebene noch sehr unzureichend. [...]
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2025-05-05
14:56
[PUBDB-2025-01533] Dissertation / PhD Thesis
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Scintillating Nanocomposites Based on Lead Halide Perovskite Nanocrystals
123 pp. () = Dissertation, Scuola Di Dottorato Universita Degli Studi Di Milano-Bicocca, 2023/2024  GO
In recent years, perovskite nanocrystals (CsPbX3, with X = Cl, Br, I) have emerged as a new class of materials for photonic and optoelectronic applications due to their exceptional synthetic scalability through solution-based processes, room-temperature fabrication and remarkable physical properties such as high emission efficiency and defect tolerance. Additionally, these materials possess tunable optical properties through controlled adjustments of their size and composition. [...]
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2025-04-15
21:30
OpenAccess [PUBDB-2025-01364] Dissertation / PhD Thesis
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Hidden symmetries in four-dimensional $\mathcal{N} = 2$ superconformal gauge theories
126 pp. () [10.3204/PUBDB-2025-01364] = Dissertation, University of Hamburg, 2025  GO
The integrability properties of $\mathcal{N}=4$ Super-Yang-Mills in the planar limit have been studied extensively and are well understood. For certain classes of theories, obtained by orbifolding $\mathcal{N}=4$ Super-Yang-Mills, it was shown that planar integrability is actually inherited and persists at the orbifold point. [...]
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2025-04-08
13:39
OpenAccess [PUBDB-2025-01297] Dissertation / PhD Thesis
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Giant radio galaxies in the LOFAR deep fields: old and lonely?
144 pp. () [10.3204/PUBDB-2025-01297] = Dissertation, University of Hamburg, 2024  GO
The study of radio galaxies (RGs) offers valuable insights into the complex dynamics between active galactic nuclei (AGN), host galaxies, and the surrounding medium. Among the diverse population of RGs, giant radio galaxies (GRGs) have a linear extent larger than 700 kpc and they are relatively rare compared to smaller RGs. [...]
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2025-04-08
13:31
OpenAccess [PUBDB-2025-01296] Dissertation / PhD Thesis
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Development of a tuneable few-femtosecond ultraviolet source up to 50 kHz repetition rate
109 pp. () [10.3204/PUBDB-2025-01296] = Dissertation, University of Hamburg, 2024  GO
Ultraviolet (UV) light plays a crucial role across various scientific fields such as biochemistry, material science and nanotechnology. Producing and using UV pulses with sub-5 fs durations is extremely demanding, but offers new possibilities for studying electron dynamics in light-induced biochemical re- actions.This thesis presents a tuneable ultrafast UV source operating at high repetition rates (up to 50 kHz), designed to be the key component of a table-top few-femtosecond UV-pump and IR-probe beamline to perform time-resolved spectroscopy measurements. [...]
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2025-04-08
12:18
OpenAccess [PUBDB-2025-01294] Dissertation / PhD Thesis
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Searches for the rare tWZ and tWγ processes at the LHC using machine learning techniques
[ETP-KA/2024-10]
159 pp. () [10.3204/PUBDB-2025-01294] = Dissertation, Karlsruher Institut für Technologie, 2025  GO
This thesis work presents the first searches and the first evidences for the $_{t}WZ$ and $_{t}W_γ$ processes at the LHC with the CMS experiment. The analyses employ proton-proton collision data corresponding to an integrated luminosity of 138 fb$^{−1}$ collected during Run 2 of the LHC between 2016 and 2018. [...]
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2025-04-08
11:46
[PUBDB-2025-01293] Dissertation / PhD Thesis
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Investigation of a Novel Protease Mediated Cell Wall Maintenance Program in Gram-Negative Bacteria
176 pp. () = Dissertation, Cornell University, 2024  GO
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