The second Randall-Sundrum model was based on a large as opposed to compactified dimension. Has the possible existence of large higher dimensions been eliminated and what evidence rules them out?
Answers and Replies
Recently, Spergel's group have written a paper based on last year's widely discussed neutron star collision which was detected using both EM as well as GW astronomy. The measurement experimentally constrains the amount of spacetime dimensions to 3+1 and it has therefore ruled out models based on the hypothesis that gravitational leakage occurs into large extra dimensions (which would explain the relative weakness of gravity), such as 3-brane models embedded in higher dimensional spaces.