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 35 for “"N-body simulations"”.
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Understanding the Formation and Evolution of Nuclei in Galaxies using N-body Simulations
… are common in all type of galaxies. I use N-body simulations to study the formation and evolution of nuclear clusters and to investigate the influence of the dynamical evolution of disc galaxies on the structural and kinematical properties of the host galaxy. I show that the second moment of …
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The Orbital Structure of Galaxies and Dark Matter Halos in N-Body Simulations
… different formation mechanism of galaxies in N-body simulations. Under 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 …
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Finding the location of Planet Nine
To find Planet Nine, we use N-body simulations to find the true anomaly of Planet Nine that would render distant KBOs the most stable. We obtain an interval of 162-198°matching the intervals given by Medvedev & Vavilov (2016) of 176-184° and Brown & Batygin (2016) of 180°. According to our results, …
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Nonlinear Growth of Structure in Cosmological Simulations
… of numerical algorithms used in cosmological N-body simulations. For the mass function, the matter power spectrum, and halo profiles --- the most important statistics for this thesis --- codes agree at less then 10% over wide dynamic ranges. This robustness gives us additional confidence in our …
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Higher Order Couplings in the Clustering of Biased Tracers of Large-Scale Structure
… biasing using the EFTofLSS and numerical N-body simulations. This thesis is comprised of the following three projects: In the first part, we present a novel method to constrain quadratic and cubic galaxy bias parameters in dark matter simulations. The natural statistics to constrain …
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Cosmology with Weak Lensing Peaks
… first question, we use a suite of ray-tracing N-body 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 …
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Constraining dark energy using real and mock galaxy surveys
… galaxy formation models implemented in N-body simulations to build mock galaxy catalogues which are well suited for use in conjunction with large photometric surveys. Using mock catalogues, we predict that Pan-STARRS1 will be able to detect 10^8 galaxies in all its 5 photometric bands. We …
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Numerical Characterization of Fragmentation in Ionic Liquid Clusters
… effect of an electric field. Molecular dynamics simulations are performed of various ionic liquid clusters under different conditions to determine the rate of fragmentation. These simulation results are also used to determine the different fragmentation pathways taken by each type of cluster, and …
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Dark Matter Halo Concentration and the Evolution of Spiral Structure in N-Body, Barred Spiral Galaxies
… concentration of the dark matter halo) in N-body simulations of barred, spiral galaxies. We also look at the evolution of pitch angle over time in higher temporal resolution than any data currently available in the literature. We find that pitch angle structure is recurring, the overall …
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The effects of stochastic forces on the evolution of planetary systems and Saturn's rings
… systems HD128311 and HD45364 are presented. N-body simulations of two planets and two dimensional hydrodynamical simulations of proto-planetary discs are used to realistically model the convergent migration phase and the capture into resonance. The results indicate that the proto-planetary disc …
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Dark matter dynamics
N-body simulations 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 …
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The Environment Of Galaxies And Groups Of Galaxies
… numerical tools - semi- analytical models and N-body plus hydrodynamical simulations of large scale structure and individual galaxies - to explore the underlying physics governing the formation and evolution of groups of galaxies, and the role of environment in generating polar structures around …
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Bondi-Hoyle-Lyttleton Accretion of Cold and Self-Interacting Dark Matter
… radius and magnitude of the accretion rate. N-body simulations of the BHL accretion geometry are performed for the case of cold dark matter (CDM), which is collisionless, and self-interacting dark matter (SIDM), which for large cross sections should approach the collisional case. The results of …
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Equipartition and mass segregation : simulations of star clusters with two mass-components
… We present new, high-accuracy collisional N-body simulations, using the high-order integrator NBODY6++. We modelled up to N=20,000 particles on the parallel supercomputer CRAY T3E, and the statistical significancy of the lower-N simulations was improved by ensemble averages. Our objective is …
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The Mt. Laguna Infrared Cluster Survey: A Search for Galaxy Clusters Beyond Z = 1
… of test clusters and through Monte Carlo simulations. These simulations show that the survey can find clusters of M ∼ 1015 h-1 M⊙ to z ∼ 1.4 and even clusters with M ∼ 2 x 1014h-1 M⊙ as distant as z ∼ 0.8. The false positive rate of the catalog is estimated to be …
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Dynamics and evolution of dense stellar systems
… clusters, based on a large number of numerical N-body simulations using our Monte-Carlo code. Heavy objects, which could represent stellar remnants such as neutron stars or black holes, exhibit behavior that is in quantitative agreement with simple analytical arguments. Light objects, which could …
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Phase-space reconstructions of cosmic velocities and the cosmic web
… the results of its applications to cosmological simulations and also to a galaxy redshift survey.The foundation of our method is relying on a statistical approach, in which a given galaxy catalogue is interpreted as a biased realization of the underlying dark matter density field. The inference …
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Investigating the AMI SZ Selection Function of Galaxy Clusters
… used to study the coherence of idealised cluster simulations with two toy models. A frequentist and Bayesian approach are modelled and then analysed with MULTINEST. PROFILE was then used to create simulated AMI observations with varying noise realizations (thermal, cosmic microwave background …
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