Hello all. This question assumes String/M/Brane theory is correct (big assumption, I know).

Brane cosmology theorizes that gravity is not constrained to our brane. If that were true could the gravity effects we observe from at least a portion of dark matter really be from matter in another brane or in the bulk, meaning we will never truly be able to determine exactly what it is, just that it is reacting gravitationally to create the scaffolding of our galaxies? Has anyone seen this possibility been incorporated into any papers and if so could you point me to them?

Thanks