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8.981 :: Selected Topics in Astrophysics

Rather than a formal syllabus, this is a listing of topics I intend to cover. This will be adjusted depending on the interest of the enrollees. Every week or so, I will update this page with a description of what was covered and what I plan to cover in the immediate future.

Planned topics

Lec 1 (Sept 10): Representation of numbers by computers; roundoff and truncation error.

Lecs 2 & 3 (Sept 15 & 17): Interpolation and extrapolation. Polynomial representation, rational function representation, cubic spline interpolation. Chebyshev representation. Chebyshev stuff might spill into week 3.

Lec 4 (Sept 22): Wrap-up of Chebyshev representation.

Lecs 5 & 6 (Sept 24 & 29): Heaviside calculus and its usefulness for deriving approximate formulas for derivatives and integrals of functions. Introduction to quadrature methods: Trapezoidal rule, Simpson's rule; construction of Simpson's rule from trapezoidal rule; Richardson extrapolation and Romberg integration. Concepts behind Gaussian quadrature.

Lecs 7, 8 & 9 (Oct 1, 6 & 8): Integration of ordinary differential equations. "Mathematical" methods (Euler, Runge-Kutta, Bulirsch-Stoer; methods for stiff equations) and "physical" methods (especially symplectic integration techniques).

Lecs 10, 11 & 12 (Oct 15, 20 & 22): Monte Carlo methods. Generation of uniform deviates (general principles behind bad methods, some of the concepts behind good methods); generation of deviates with a specified PDF. Application to Monte Carlo integration and Markov Chain Monte Carlo.

Lecs 13 (Oct 27): Root finders: Overview of bisection, secant and Newton's method; generalization of Newton's method to multidimensional problems. (Note, no class was held on Oct 29th due to a departmental event.)

Topics to be loosely planned to be covered

Solutions of systems of equations
Eigensystems
Fast fourier transforms
Solution of partial differential equations

This list is likely to expand ... and topics which are not covered here are grist for student projects.