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.
Results
Showing 1 to 20 of 26 for “"Dark Matter Halos"”.
-
Understanding dark matter halos with tidal caustics
… gamma-ray signal from self-interactions in the dark matter component, for likely particle models of dark matter. We find that the expected signal is an order of magnitude too low to be detected with current instruments. We also study the constraints that can be placed on the properties of the …
-
Structure and Local Properties of Dark Matter Halos
The structure and local properties of dark matter (DM) are important input variables for both direct and indirect detection experiments. Common assumptions about DM, such as, its particle nature being cold and collisionless–CDM–and its distribution in halos being isothermal and spherical, and …
-
Extracting information from the exteriors of dark matter halos
… amounts of time has been spent studying dark matter halos, the environment around halos and the impact this environment has on structures that pass through it has not been investigated in nearly as much detail. In this thesis we perform several different studies all related to extracting …
-
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 …
-
Decoding Dark Matter Halos through the Lens of Machine Learning
Dark matter (DM) constitutes about 85% of the matter in the Universe, yet its particle nature remains one of the greatest outstanding questions in astrophysics. DM halos act as the scaffolding within which galaxies form, but the specific mechanisms through which they influence galaxy evolution are …
-
Phase-Space Distributions of Galactic Dark Matter Halos and Implications for Detection
<p>This work focuses on models of galactic dark matter halos and observational prospects. We investigate the impact of careful computation of the phase-space density and velocity distribution of weakly-interacting massive particles, a major class of dark matter particle candidates, in the Milky …
-
Characterization of the physical properties of massive dark matter halos from magnification bias
Esta tesis explora en profundidad el sesgo de magnificación utilizando galaxias submilimétricas (SMGs, por sus siglas en inglés) como fuentes de fondo para estudiar los perfiles de densidad de masa de diversos tipos de lentes, incluyendo cuásares, galaxias y cúmulos de galaxias. La metodología se …
-
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 …
-
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 …
-
The effects of inelastic self-interacting dark matter on galactic halo properties v/
Self-interacting dark matter, which serves as an alternative to collisionless cold dark matter, may be useful for solving the small-scale galaxy formation problems present in the Lambda-Cold Dark Matter model. So far, most self-interacting dark matter simulations have considered only elastic …
-
Fast galactic structure finding using graphics processing units
… of gravitationally-bound objects such as dark matter halos, is a crucial step in many such simulations. During recent years, advancing computational capacity has lead to halo-finders needing to manage increasingly larger simulations. As a result, many multi-core solutions have arisen in an …
-
Dark matter dynamics
… have revealed a wealth of information about dark matter halos but their results are largely empirical. Here we attempt to shed light on simulation results by using a combination of analytic and numerical methods. First we generalize an analytic model of halo formation, known as Secondary …
-
Cosmology with Weak Lensing Peaks
… simulations, in which we identify individual dark matter halos. We study the halos' contribution to the peaks. We find that high peaks are typically dominated by a single massive halo, while low peaks are created by galaxy shape noise, but with an important contribution from a line-of-sight …
-
The Kinematical Parameters of Minor Mergers and their Observational Traces
… simulations the kinematical properties of dark matter halos that are minor merging and their abundance in space and time. We found that minor merger were most likely at a time 7Gyrs ago and happened typically once for a Milky Way sized halo. Their pericenter distances and their …
-
The Impact of realistic galaxy orbits on jellyfish galaxy properties
Galaxy clusters, the most massive dark matter halos in the universe, decisively influence their environment and the evolution of galaxies within them. As galaxies move supersonically through the hot, magnetized intracluster medium (ICM) filling the space between galaxies in galaxy clusters, ram …
-
Mapping the Ancient Milky Way and its Relic Dwarf Galaxies
… first stars and galaxies began transforming the dark, primitive universe into the rich, complex one that we observe today. These primitive objects thus govern crucial, foundational rungs in our understanding of how the universe came to be. However, little is directly known of their properties …
-
N(th)-Order Correlation Functions of Galaxies From the Sloan Digital Sky Survey
… to determine that the normalization of the matter power spectrum at 8 h-1 Mpc, sigma8, is 0.79 +/- 0.05 and c2,LRG = 0.09 +/- 0.04---consistent with the DR5 early-type results. I have calculated o2(theta) of galaxies from SDSS DR5 to constrain the HOD of galaxies as a function of type. I …
-
Cosmological signatures of fundamental physics
… physics - for example, the inference of dark matter and dark energy from cosmological observations remain the most significant evidence of new physics beyond the Standard Model of particle physics. Another example is the cosmological scalar-to-tensor ratio, which can potentially …
-
Topics in cosmology: structure formation, dark energy and recombination
… in finding the accretion and merger history of dark matter halos. Dark matter halos are the collapsed dark matter structures in the late time evolution of the universe, whose existence is vital for the formation of galaxies in the Universe as they act as the potential wells where normal matter …
-
The Universal Rotation Curve of Disk Galaxies
… of cosmology, the formation and evolution of dark matter halos plays an essential role in galaxy development. However, the response of the halo to internal baryonic processes is difficult to observe. We tackle this problem through an investigation of the Universal Rotation Curve (URC) …
Page 1 of 2