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Showing 1 to 6 of 6 for “"Boltzmann equations"”.
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Exact non-equilibrium solutions of the Einstein-Boltzmann equations
In this thesis we use the exact solution of the Boltzmann equation, with a relaxation-time model of collisions, to find solutions of the Einstein-Boltzmann system of equations. A covariant harmonic decomposition of the distribution function is used to obtain exact results. The conditions imposed by …
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Neutrino masses and Baryogenesis via Leptogenesis in the Exceptional Supersymmetric Standard Model
… of lepton/baryon asymmetries is described by Boltzmann Equations. Numerical calculation of the Boltzmann Equations shows that a correct amount of baryon number in the universe can be achieved when the lightest right-handed neutrino mass is ∼ 10^7 GeV, and then the gravitino-over-production …
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First steps in development of a translational non equilibrium model using maximum entropy principle
… The backbone of the model relies on Boltzmann equation for gases as a starting point. Three mathematical tools - domain decomposition, moment methods similar to method of weighted residuals and maximum entropy principle are used for defining the model and developing the underlying …
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The discrete velocity method in plasma physics
… with the discrete velocity models. The discrete Boltzmann equation (DBE) is a commonly used discrete velocity method for problems in rarefied gas dynamics and is adapted for plasma physics in this thesis. The Boltzmann equation is used to model the relaxation to equilibrium of a pure electron …
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Carrier momentum relaxation in highly doped polar semiconductors and semiconductor heterostructures
… We achieved this by solving the coupled Boltzmann equations for the carriers and the collective excitations, focusing on the “drag” term and on the anharmonic decay process of the collective modes. Our approach uses dielectric functions to describe both the carrier-collective mode …
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Three Methods for Solving the Low Energy Neutron Boltzmann Equation
<p>The solution to the neutron Boltzmann equation is separated into a straightahead component dominating at high energies and an isotropic component dominating at low energies. The high-energy solution is calculated using HZETRN-05, and the low-energy isotropic component is modeled by two …