Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"axion"”.
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The instanton liquid and the axion
… to improve our understanding of the cosmology of axions. Axions couple to QCD instantons and these non-perturbative effects are modeled within the framework of the interacting instanton liquid model (IILM). The thesis describes the significant advances made within the IILM in order to study the …
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Holographic and Composite Models of the Axion
The axion, first proposed to solve the absence of a neutron electric dipole moment, is also an excellent dark matter candidate. If the axion is composite, it must be bound by a novel strong interaction. Some strongly-coupled models, mathematically intractable until now, are recently discovered to …
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Topics on electron,neutrino and axion scattering
… Accelerator Facility. The Mississippi State Axion Search, an axion search experiment which uses light shining through a wall technique is described in detail, including its instrumentation, initial tests and future impact. Furthermore, a novel method of detection of solar anti-neutrinos based …
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Modeling Astrophysical and Large-Scale Structure Signatures in Axion Cosmologies
… of a multitude of pseudoscalar particles called axions with logarithmically distributed masses, potentially addressing both the DM and dark energy problems simultaneously. Combining theoretical analyses with numerical simulations, we unravel the distinct signatures of FDM across intergalactic and …
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The First Laboratory Searches for Low-Mass Axion Dark Matter
… well-motivated dark matter candidates is the axion, a hypothetical particle that is predicted by the solution to another long-standing mystery in physics, the strong CP problem. The Standard Model predicts that CP symmetry should be violated by the strong force. However, precision measurements …
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Search for axion-like particles in the slac beam dump
A search for axion-like particles was made at the Stanford Linear Accelerator Center (SLAC) by dumping 30 Coulombs of 20 GeV electrons into a beam absorption facility. After 179 meters of earth shielding the in-flight decay of the particle into two photons or an electron-positron pair, in a decay …
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The Search for High-Frequency Gravitational Waves with a Modified Axion Detector
… has had great success as a lumped-element axion dark matter pathfinder experiment, with two published axion searches and an extensive background investigation. Now, using the electrodynamics of gravitational waves and a simple change of pickup structures, we are using the ABRACADABRA …
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Commissioning the DIRC Detector and Searching for Axion-like Particles at GlueX
… proposed to solve the strong CP problem, axions and axion-like particles are hypothetical pseudoscalar particles found in many proposed extensions to the Standard Model of particle physics. This thesis presents a search for photoproduction of axion-like particles using data in …
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An improved RF cavity search for halo axions
The axion is a hypothetical elementary particle and cold dark matter candidate. In this RF cavity experiment, halo axions entering a resonant cavity immersed in a static magnetic field convert into microwave photons, with the resulting photons detected by a low-noise receiver. I present new limits …
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Search For Solar Axions
… generates a Nambu-Goldstone boson called the axion. Although there are various detection mechanisms that search for the axion, this thesis focuses on the the axio-electric effect. The axio-electric is similar to the photo-electric effect in that an axion is absorbed by an atom which …
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Development of the Magnetic Shielding and Rotational Stability Apparatus for use in the ARIADNE Project
The QCD axion is a particle that is postulated to solve the Strong-CP problem, but also could account for all of the Dark Matter currently being observed in the Universe. Our group is involved in developing an experiment with the goal of detecting the QCD Axion. The Axion Resonant InterAction …
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A Charcuterie Platter of QCD Matter
… and its potential completions: How robust is the axion solution to the strong CP (ChargeParity) problem, and what are some of its implications beyond the realm of QCD? I examine the axion quality problem in post-inflationary QCD axion models with different symmetry properties and identify a new …
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GHz Gravitational Wave and THz Dark Matter Detectors: Analysis and Simulation
… noise and other complications. Dark matter (DM) axions can similarly be detected through the inverse Primakoff effect. Although not directly detected yet, axions are anticipated to produce stronger coherent signals and would additionally solve the strong charge-parity problem in QCD. Current …
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Dark Matter Production after Inflation and Constraints
… space of a sub-eV dark matter candidate, the axion. We show that using the Cosmic Microwave Background radiation constraint on the effective number of relativistic species, an interesting constraint can be placed. This bound arises from the fact that the field whose angular excitations are the …
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Spontaneous CP-Violation in Two Higgs Doublet Supersymmetric Models
… of the vacuum and the existence of a light axion are discussed. We investigate the feasibility of spontaneously broken CP in the minimal supersymmetric models - the MSSM and NMSSM. The latter is shown to be experimentally viable. The phenomenological implications of the model such as …
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Supersymmetric Backgrounds in string theory
… a way to compute the complex structure and axion dilaton moduli explicitly. In the second part, we discuss $(0,2)$ supersymmetric versions of some recent exotic $mathcal{N}=(2,2)$ supersymmetric gauged linear sigma models, describing intersections of Grassmannians. In the next part, we …
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Illuminating the Nature of Dark Matter through Observation, Simulation and Machine Learning
… echoes of astrophysical radio sources to probe axion dark matter, self-consistently simulating dark matter energy injection in the era of reionization, employing simple Neural Networks to improve these early universe simulations, and utilizing Machine Learning-powered inference techniques to …
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Exploring linear and nonlinear electromagnetic responses in topological materials
… electromagnetic responses) to study the axionic electromagnetic response. We specifically focus on methods for experimentally observing the axion through a collective optical response. We not only show that optical evidence of the axion is possible, but we also extend our analysis to …
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Supersymmetry, supergravity, and String Theory based inflationary cosmology
… in inflationary model building. As a result, axion monodromy is considered. Representative models are compared to analysis of precision measurements of the cosmic microwave background radiation. This comparison is achieved using observable derived constraints of the spectral index and tensor …
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Inflationary cosmology and fundamental physics
… topics that are directly related to inflation: axions, string theory, and non-minimally coupled fields. In particular, we constrain the allowed parameter space of inflationary axion cosmology, identifying a classic window and an anthropic window; we discuss inflation in string theory, proving a …
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