Perhaps an unknown property of gravity....

[chaszz]

The mystery of dark matter seems to resist solution. Search after search comes up empty for the various hypothetical particles that could account for it. Is it possible that gravity itself in sufficient density, as on a galactic scale, has some multiplier effect we have not discovered and GR theory has not considered. So that this effect would be a property of gravity itself rather than the result of too little mass, and looking for missing particles may be the wrong direction altogether.

 

[PeterDonis]

Is it possible that gravity itself in sufficient density, as on a galactic scale, has some multiplier effect we have not discovered and GR theory has not considered.

This is too vague to answer. If you can find a peer-reviewed paper that discusses such a possibility, you might be able to start a discussion based on that. But PF is not in general intended for discussion of speculations. This thread is closed.