Is it possible that M-Theory provides a solution to the mystery of dark matter and dark energy?
The idea of dark matter and dark energy is that there is some inexplicable source affecting our universe.
M-Theory suggests that there are other universes as well as our own. If there were some degree of interaction between the universes, this could explain both the unaccounted for acceleration of our universe's expansion in which dark energy is suggested as well as the unidentified mass of our universe which is termed dark matter.
If the other universes are orthogonal to some or all of our universe's dimensions, then both effects seem very possible. Could the other universes' mass have some affect within our universe causing the gravitational effects on visible matter, radiation, and the large-scale structure of the universe? Could those universes also be causing the accelerated expansion of our universe by literally pulling it apart through similar gravitational effects.
All of the effects and oddities seem like they would fall out of M-Theory easily. The extra dimensions of M-Theory seem well-suited for explaining both effects. Some dimensions could be effected by some alternate universes causing anomalies such as have been detected and relegated to dark matter. While, maybe, all of the alternate universes could act as a gravitational pull on the very fabric of the universe through the more pedestrian three dimensions, as is suggested for dark energy.