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- W2247497503 abstract "The goal of much research in relativity is to understand gravitational waves generated by a strong-field dynamical spacetime. Quantities of particular interest for many calculations are the Weyl scalar ${ensuremath{psi}}_{4}$, which is simply related to the flux of gravitational waves far from the source, and the flux of energy carried to distant observers, $stackrel{ifmmode dot{}else textperiodcentered fi{}}{E}$. Conservation laws guarantee that, in asympotically flat spacetimes, ${ensuremath{psi}}_{4}ensuremath{propto}1/r$ and $stackrel{ifmmode dot{}else textperiodcentered fi{}}{E}ensuremath{propto}1/{r}^{2}$ as $rensuremath{rightarrow}ensuremath{infty}$. Most calculations extract these quantities at some finite extraction radius. An understanding of finite radius corrections to ${ensuremath{psi}}_{4}$ and $stackrel{ifmmode dot{}else textperiodcentered fi{}}{E}$ allows us to more accurately infer their asymptotic values from a computation. In this paper, we show that, if the final state of the system is a black hole, then the leading correction to ${ensuremath{psi}}_{4}$ is $mathcal{O}(1/{r}^{3})$, and that to the energy flux is $mathcal{O}(1/{r}^{4})$---not $mathcal{O}(1/{r}^{2})$ and $mathcal{O}(1/{r}^{3})$, as one might naively guess. Our argument only relies on the behavior of the curvature scalars for black hole spacetimes. Using black hole perturbation theory, we calculate the corrections to the leading falloff, showing that it is quite easy to correct for finite extraction radius effects." @default.
- W2247497503 created "2016-06-24" @default.
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- W2247497503 date "2010-11-01" @default.
- W2247497503 modified "2023-09-23" @default.
- W2247497503 title "Falloff of radiated energy in black hole spacetimes" @default.
- W2247497503 hasPublicationYear "2010" @default.
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