MG12 - Talk detail |
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Participant |
Bentivegna, Eloisa | |
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Institution |
Louisiana State University - 216 Johnston - Baton Rouge - Louisiana - USA | |
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Session |
Talk |
Abstract |
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ANM2-ANM3 |
Constant-expansion surfaces for finite-distance extraction of observables in Numerical Relativity |
In General Relativity, the estimate of angular momentum and other physical observables is complicated by a number of factors, such as their non-localizability and the ambiguities in defining a reference frame in which to measure them. Most of these issues seriously affect numerical simulations, where only portions of a spacetime are usually accessible, and one has very little control over the coordinates used and their evolution. I will discuss how surfaces of constant expansion show the potential to resolve the ambiguities and alleviate these problems. |