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 96 for “"N-Body"”.
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On the N-body Problem
… a central configuration in the collinear four body problem. Specifically it is proved that there is a compact region in which no central configuration is possible for positive masses. Conversely, for any configuration in the complement of the compact region, it is always possible to choose …
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Distribution-independent hierarchical N-body methods
<p>The N-body problem is to simulate the motion of N particles under the influence of mutual force fields based on an inverse square Law; The problem has applications in several domains including astrophysics, molecular dynamics, fluid dynamics, radiosity methods in computer graphics and numerical …
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Solving the N-body problem in astrophysics
The astrophysical N-body problem describes N point masses interacting with each other through pairwise gravitational forces. A solution of this problem is frequently necessary in dynamical astronomy. In the collisional N-body problem, the relaxation time is small compared to the timescale we are …
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Mathematical and Computational Methods for the n-Body Problem
The gravitational n-body problem, considered one of the most classical and enduring challenges in celestial mechanics, seeks to describe the motion of n masses interacting through Newtonian gravity. Despite its deceptively simple formulation, the problem exhibits a profound interplay between order …
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Spatial reasoning for generalized N-body physics : discrete element algorithms
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1999.
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A Solution to the Circular Restricted N Body Problem in Planetary Systems
… in many different ways in the past - the N body problem. By focusing on planetary systems, satellite dynamics can be modeled in a fashion similar to the Circular Restricted Three Body Problem (CR3BP) with the Circular Restricted N Body Problem (CRNBP). It was found that this new formulation …
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Existence of expansive solutions and Hamilton-Jacobi equations for the N-body problem
L'abstract è presente nell'allegato / the abstract is in the attachment
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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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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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Symplectic maps for the N-body problem with applications to solar system dynamics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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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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Vorticity structure and evolution in a transverse jet with new algorithms for scalable particle simulation
… computational approach requires hierarchical N-body methods for velocity evaluation at each timestep, as direct summation is prohibitively expensive. We introduce new clustering algorithms for parallel domain decomposition of N-body interactions and demonstrate the optimality of the resulting …
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Simulations of the Formation of Tidal Dwarf Galaxies
… untersucht. Wir stellen fest, dass in reinen N-body Simulationen keine kollabierten Objekte in den Gezeitenarmen entstehen, waehrend Gas effizient den gravitativen Kollaps in Gezeitenarmen triggert, sofern die Gasscheibe der Vorgaenger Galaxie hinreichend grosse Ausdehnung besitzt. Mittels einer …
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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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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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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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