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Speaker |
Bozza, Valerio |
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Coauthors |
Valerio Bozza, Adriana Postiglione |
| Talk Title |
Alternatives To Schwarzschild In The Weak Field Limit |
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Abstract |
Isolated objects are normally matched to an exterior Schwarzschild metric asymptotically falling down as 1/r. However, some examples of metrics falling faster than Schwarzschild are known: the Ellis wormhole, for example, falls as 1/r^2. Metrics falling faster than Schwarzschild have also been studied in the context of gravitational lensing, since they give rise to characteristic defocusing effects. Here we present a full classification and investigation of metrics with non-Schwarzschild weak field limit, analyzing the physical properties of the sources that support them, including the validity of energy conditions and the observational consequences of such metrics. Interestingly, we notice that even a minimally coupled scalar field with a simple power law potential can support a metric falling as 1/r^q with arbitrary exponent. The observation of objects with non-Schwarzschild metrics would be the signature of local violations of the weak energy condition. |
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