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 37 for “"Dark matter halo"”.
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Statistics of the Dark Matter Halo Distribution in Cosmic Density Fields
… Klumpen aus dunkler Materie (dunkle Halos). Obwohl die hydrodynamischen Prozesse, die an der Entstehung von Galaxien beteiligt sind, noch wenig verstanden sind, wird angenommen, daß diese Prozesse für die Entstehung einzelner Objekte relevant sind und daß sie möglicherweiser keine …
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Dark Matter Halo Concentration and the Evolution of Spiral Structure in N-Body, Barred Spiral Galaxies
… as well as the theoretical relationship between halo mass concentration and the density of visible matter in the central part of the galaxy, we look at a possible relationship between P and cvir (the virial concentration of the dark matter halo) in N-body simulations of barred, spiral galaxies. …
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The Effect of the Large Magellanic Cloud on the Dark Matter Halo of the Milky Way
… measurements of tracers (satel- lites, streams, halo stars) of the dark matter (DM) distribution and assembly history of the MW. Using results from 8 high-resolution N-body simulations, I will describe the main perturbations caused by the LMC: the DM wake, the barycenter displace- ment, and the …
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The influences of dark matter halo formation history on black hole growth, circumgalactic gas expulsion and galaxy evolution
… do not evolve in isolation, but exist in haloes of dark matter and gas, embedded in the large-scale "cosmic web". To build a self-consistent model for how galaxies form and evolve, it is vital to understand how galaxies regulate their formation through interaction with the "circumgalactic …
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The relationship between the morphology and kinematics of galaxies and its dependence on dark matter halo structure in simulated galaxies
… the intrinsic morphology of the galaxy’s inner dark matter halo, i.e. the halo’s morphology that emerges in the absence of dissipative baryonic physics. This implies the existence of a causal relationship between the morphologies of galaxies and that of their host dark matter haloes. Using these …
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A search for Z = -1 dark matter annihilation products in cosmic rays with AMS-01
… has not been observed optically and is termed dark matter. The supersymmetric neutralino provides an interesting dark matter candidate, which may self-annihilate in our galaxy, producing particles visible in the cosmic ray spectrum. During a ten day space shuttle flight, the AMS-01 detector …
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The Orbital Structure of Galaxies and Dark Matter Halos in N-Body Simulations
… the assumption that particles in a spherical dark matter halo move on circular orbits we can predict the amount of contraction of the dark matter halo during the slow formation of the disk with an adiabatic approximation. We find in N-body simulations that the adiabatic approximation is valid …
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An improved RF cavity search for halo axions
… 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 on the …
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Stellar Spiral Structures in Realistic Dark Matter Haloes
… stellar spiral structures embedded in realistic dark matter haloes with very high resolution simulations. I first study the impact of the shape of the dark matter haloes. I find that non-adiabatic changes to the dark matter halo shape, commonly found in cosmological simulations due to the …
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The structure and spatial distribution of dark matter halos
… study of how the distribution and properties of dark matter halos can be utilized as probes of fundamental questions in modern cosmology. Spatial clustering of dark matter halo carry a wealth of information regarding its evolution history and environment. In particular, I study halo assembly …
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The structure and evolution of dark matter halos and their implications for cosmology
This is a study of how the properties of dark matter halos can be used to probe fundamental questions in cosmology. Similar to the inner regions of a halo the outer density profiles of the dark matter halo carry a wealth of information regarding its formation epoch, accretion history and …
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First results from a 20-liter prototype dark matter detector with directional sensitivity
… of the universe is in the form of non-baryonic matter referred to as "dark matter." Weakly interacting massive particles have long been considered attractive candidates for this dark matter and can be found in a wide variety of models of physics beyond the Standard Model. The Dark Matter Time …
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Demographics of supermassive black holes
… resolved. However, usually the presence of a dark matter halo is ignored in the dynamical modeling, potentially causing a bias on the determined black hole mass. I ran dynamical models for a sample of 12 galaxies, including a dark matter halo. For galaxies for which the black hole's sphere of …
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Reconstructing nuclear recoil tracks in the Dark Matter Time Projection Chamber
… is in the form of nonluminous, nonbaryonic matter referred to as dark matter. One theoretically appealing dark matter candidate is the Weakly Interacting Massive Particle (WIMP). Because of astrophysical dynamics, the detectable signal from the expected WIMP dark matter halo should exhibit a …
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Identification and Reduction of the Alpha Background, From 238U and 232Th Decay Chains, in the DEAP-3600 Experiment.
… from the past century indicate that non-baryonic matter, commonly referred to as dark matter, dominates the composition of the universe. Discovering the nature and properties of dark matter has been one of the most pursued goals of modern physics. The DEAP collaboration developed a single-phase …
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Searching for Interacting Early Type Galaxies at Late Cosmic Times
… signatures residing in groups and clusters with halo masses M[subscript halo] ≥ 2.5 x 10¹³ M[subscript ☉]. The tidal sgnatures of such interactions may often be too faint to be clearly detected at the sensitivity of SDSS imaging data. To improve constraints and test the identification of dry …
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Heavy neutrino balls and the supermassive dark object at the Galactic center
… the most natural, particle candidate for the dark matter. We investigate here the properties and astrophysical implications of self-gravitating degenerate heavy neutrino matter. Neutrinos of 10 to 25 keV/c² might cluster around the sun forming a halo of a few solar masses and a few light years …
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A search for light weakly-interacting massive particles with SuperCDMS and applications to neutrino physics
… astrophysical evidence indicates that 85% of the matter content of the universe is in the form of non-baryonic dark matter. A large number of experiments are currently undertaking searches for weakly-interacting massive particles (WIMPs), the leading class of particle candidates for dark matter. …
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The Methodology of Modelling the Milky Way with Stellar Streams
… of the Milky Way suggests a triaxial dark matter halo with axis ratios $3.3\pm 0.7$ and $2.7\pm 0.4$ where the short axis is pointed near the Sun-Galactic center line and the intermediate axis is perpendicular to the disk. Additionally, this combination of constraints reduces the …
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GALAXY-HALO CONNECTION AND CLUSTERING IN THE PRESENCE OF DYNAMICAL DARK ENERGY AND MASSIVE NEUTRINOS
… on the modelling of the connection between dark matter subhaloes and galaxies, and the analysis of the galaxy cluster mass function and clustering, in cosmologies alternative to the standard LCDM model. To this aim a large set of cosmological N-body simulations has been used, the so-called …
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