Salvatore Capozziello, Prado Martin-Moruno
In this letter, we point out a possible ambiguity of bimetric gravity due to the impossibility of observing directly the matter content of the space that we are not inhabiting. Nevertheless, some conclusions can still be extracted independently of the matter content filling both spaces. In particular, we can conclude the occurrence of some extremality events in one universe if we know that they take place in the other space.
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http://arxiv.org/abs/1211.0214
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