Numerical relativity from a gauge theory perspective
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720922435-MIT.pdf
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Full printable version
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3.47 MB
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4a6a0e18537d6e629f7c44bfb98751d8
Author(s)
Farr, Will M. (Will Meierjurgen)
Advisor(s)
Edmund Bertschinger.
Date Issued
2010
Publisher
Massachusetts Institute of Technology
Abstract
I present a new method for numerical simulations of general relativistic systems that eliminates constraint violating modes without the need for constraint damping or the introduction of extra dynamical fields. The method is a type of variational integrator. It is based on a discretization of an action for gravity (the Plebański action) on an unstructured mesh that preserves the local Lorentz transformation and diffeomorphism symmetries of the continuous action. Applying Hamilton's principle of stationary action gives discrete field equations on the mesh. For each gauge degree of freedom there is a corresponding discrete constraint; the remaining discrete evolution equations exactly preserve these constraints under time-evolution. I validate the method using simulations of several analytically solvable spacetimes: a weak gravitational wave spacetime, the Schwarzschild spacetime, and the Kerr spacetime.
Description
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 121-123).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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