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Suppose the black hole interior (non-kerr, kerr-like,...) is made of some kind of subsubatomic stuff (e.g., folded strings or superstrings, folded branes, buches of preonic pregeometry or whatever). Under what circumstances could be read out and differentiate between different interior models? Would we notice with gravitational waves or are they model-depedent? If our Universe began as singularity, could be detect the imprints of the "initigal singularity" with the aid of the cosmic graviton background too?

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