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Construction of Green's functions for the Boltzmann equations Shih-Hsien Yu Department of Mathematics National University of Singapore
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Motivation to investigate Green’s function for Boltzmann equation before 2003 Nonlinear time-asymptotic stability of a Boltzmann shock profile Zero total macroscopic perturbations Nonlinear time-asymptotic stability of a Knudsen layer for the Boltzmann Equation Mach number <-1
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Green’s function of linearized equation around a global Maxwellian, Fourier transformation The inverse transformation
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Initial value problem Particle-like wave-like decomposition
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Pointwise of structure of the Green’s function Space dimension=3 Space dimension=1
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Macroscopic wave structure of 1-D Green’s function Application: Pointwise time-asymptotic stability of a global Maxwellian state in 1-D.
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Green’s function of linearized equation around a global Maxwellian M,, in a half-space problem x>0. Green identity: Boundary value estimates ( a priori estimate):
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Approximate boundary data for case |Mach(M)|<1 Upwind damping approximation to the boundary data
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An approximation to the full boundary data.
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Green’s function of linearized equation around a stationary shock profile.
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Separation of wave structures Transversal wave Compressive wave
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1. Shift data
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2. Hyperbolic Decomposition Transversal wave Compressive wave 3. Transverse Operator and Local Wave Front tracing
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4. Coupling of T and D operators 5. Respond to Coupling
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6. Approximation to Respond, Compressive Operator
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6. T-C scheme for An estimates
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A Diagram for A Diagram for general pattern + extra time decaying rate in microscopic component nonlinear stability of Boltzmann shock profile
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Applications of the Green’s functions Nonlinear invariant manifolds for steady Boltzmann flow
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Applications of the Green’s functions Milne’s problme
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Sone’s Diagram for Condensation-Evaporation
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