Physics thesis and dissertation collection
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Recent Submissions
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Measurement of the CP violating phase Φₛ using B⁰ₛ → J/ψK⁺ K⁻ decays at the LHCb experiment
(The University of Edinburgh, 2020-11-30)The LHCb experiment at the Large Hadron Collider (LHC) at CERN is designed to search for indirect evidence of physics beyond the Standard Model (SM) in CP violation and rare decays of beauty and charm hadrons. One of the ... -
Sensitivity projections for hidden photons and axion-like particles in the LUX-ZEPLIN experiment
(The University of Edinburgh, 2020-11-30)The particle nature of dark matter is one of the yet unresolved puzzles in contemporary physics. The properties of dark matter, as revealed by several types of cosmological evidence, are inconsistent with the Standard Model ... -
Infrared divergences in scattering amplitudes from correlators of Wilson Lines
(The University of Edinburgh, 2020-11-30)Scattering amplitudes in theories with massless particles feature infrared (IR) divergences. In QCD, gluons are massless and when their momenta tends to zero the amplitude diverges. We call this a soft divergence. For ... -
Diagrammatic coaction of two-loop Feynman integrals
(The University of Edinburgh, 2020-07-27)When evaluating Feynman integrals as Laurent series in the dimensional regulator epsilon one encounters families of iterated integrals, the simplest of which are the multiple polylogarithms. These functions are known to ... -
β-delayed neutron emission from r-process nuclei along the N=82 shell closure
(The University of Edinburgh, 2020-07-25)The rapid-neutron capture process (r -process) is thought to be responsible for the production of around half the elements heavier than iron. Despite first being proposed almost six decades ago, the astrophysical site ... -
Underground study at LUNA of proton-induced reactions on 6Li at astrophysical energies
(The University of Edinburgh, 2020-07-25)Big Bang Nucleosynthesis (BBN) theory coupled with Cosmic Microwave Background measurements provide predictions on the modern day abundances of low mass isotopes, which are then compared to observations from stellar ... -
Perovskites under extreme conditions: pushing the limits of neutron diffraction
(The University of Edinburgh, 2020-06-25)The application of hydrostatic pressure and temperature are effective methods for manipulating and correlating crystal structures and physical properties of materials. Volume, interatomic distances, chemical bonds, local ... -
Ammonia water mixtures at extreme pressures and temperatures
(The University of Edinburgh, 2020-06-25)The ice giants Uranus and Neptune, and exoplanets like them, contain large amounts of water, ammonia, and methane ices, as well as hydrogen in various forms. Yet it is unknown how these compounds organize themselves under ... -
Observation of new Ξ꜀⁰ states decaying to Λ꜀⁺K⁻, and development of the TORCH time-of-flight detector
(The University of Edinburgh, 2020-06-25)Using a data sample of proton-proton collisions at center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb-1 collected by the LHCb experiment, the Λc+K- mass spectrum is studied. Three new, ... -
Development of a modulation-based magneto-optic Kerr effect (MOKE) microscope
(The University of Edinburgh, 2020-06-25)The magneto-optic Kerr effect (MOKE) is the rotation and ellipticity change of polarised light upon reflection from a magnetic material. This thesis outlines the development of a MOKE setup using a modulation technique to ... -
Active interfaces, a universal approach
(The University of Edinburgh, 2020-06-25)This thesis proposes and characterises a stochastic model of an active interface within the framework of statistical mechanics. Statistical methods have indeed proven successful in probing the dynamics of kinetically ... -
Computer simulations of chromatin structures at nucleosome resolution
(The University of Edinburgh, 2020-06-25)In this thesis, I present the results from my research into the properties and organisation of chromatin structures at a nucleosome resolution. Nucleosomes, a secondary structure of DNA, are essential to the compaction and ... -
Structure and dynamics of filled liquid crystals
(The University of Edinburgh, 2020-06-25)In the formulation world, rheological properties like flow behavior and viscoelastic response determine the quality of the product. For the first time, we explore and explain the dynamic response of filled nematic thermotropic ... -
Microscopic study of the freeze-thaw stability of particle-stabilised emulsions
(The University of Edinburgh, 2020-06-25)Particle-stabilised, or Pickering, emulsions are widely used in the food and personal care industries and are present in common household products such as homogenised milk and food spreads. Pickering stabilisation has also ... -
Structure and mechanical properties of model colloids at liquid interfaces
(The University of Edinburgh, 2020-06-25)Colloidal particles adsorbed to liquid interfaces appear in a broad range of industries such as foods, mining and oil recovery. Yet our understanding of such systems remains incomplete. This thesis aims to characterise a ... -
Simulations of dynamics and motility in active fluids
(The University of Edinburgh, 2020-06-25)Active fluids are ubiquitous in nature, spanning both microscopic and macroscopic length scales. They belong to an interesting new class of nonequilibrium systems in physics. In contrast with externally driven materials, ... -
Friction and the flow of concentrated suspensions
(The University of Edinburgh, 2020-06-25)Suspensions are ubiquitous in industrial processing, yet fundamental understanding of how they flow remains limited. Recent progress on shear-thickening suspensions of non-Brownian particles establishes the importance of ... -
Framework for testing the fundamental principles in gravitation and cosmology
(The University of Edinburgh, 2020-06-25)In this thesis, we consider how in practice fundamental principles can be constrained by cosmological surveys, mainly by considering popular modifications of Einstein’s general relativity. We specifically investigate (1) ... -
Cosmic shear analysis from theory to data
(The University of Edinburgh, 2016-06-29)One of the most important challenges in cosmology today is understanding the dark matter and dark energy which composite together 95% of the cosmic energy density of the Universe. Weak gravitational lensing by large scale ... -
Broad emission line variability in active galactic nuclei on long timescales
(The University of Edinburgh, 2019-12-23)Active Galactic Nuclei are among the most powerful sources of radiation in the Universe and are known to show variability across the EM spectrum. This thesis will focus on the variability in the optical and UV range, ...
