Abstract
It is well known that the interior and exterior Schwarzschild solutions are of different conformal type. More examples of this phenomenon are easily found in the literature. A precise statement of this phenomenon is given together with a theorem stating that this will take place if the matter tensor of the interior solution satisfies some weak energy conditions and if some reasonable conditions are fulfilled.
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Dhooghe, P.F.J. A theorem on the conformal structure of interior space-times. Gen Relat Gravit 12, 895–901 (1980). https://doi.org/10.1007/BF00757358
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DOI: https://doi.org/10.1007/BF00757358