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Calculating initial data for the conformal Einstein equations by pseudo-spectral methods | | Jörg Frauendiener
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26 Jun 1998 | | Subject: | gr-qc | | Abstract: | We present a numerical scheme for determining hyperboloidal initial data sets for the conformal field equations by using pseudo-spectral methods. This problem is split into two parts. The first step is the determination of a suitable conformal factor which transforms from an initial data set in physical space-time to a hyperboloidal hypersurface in the ambient conformal manifold. This is achieved by solving the Yamabe equation, a non-linear second order equation. The second step is a division by the conformal factor of certain fields which vanish on $scri$, the zero set of the conformal factor. The challenge there is to numerically obtain a smooth quotient. Both parts are treated by pseudo-spectral methods. The non-linear equation is solved iteratively while the division problem is treated by transforming the problem to the coefficient space, solving it there by the QR-factorisation of a suitable matrix, and then transforming back. These hyperboloidal initial data can be used to generate general relativistic space-times by evolution with the conformal field equations. | | Source: | arXiv, gr-qc/9806103 | | Services: | Forum | Review | PDF | Favorites | |
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