> String theory predicts that, during gravity wave generating events, ripples should also be travelling through the extra spatial dimensions and that there should be subtle interactions between the standard waves and those hidden from view. If there are extra dimensions it would lead to another mode of shrinking and stretching, this would produce a “breathing” effect, superimposed on the main gravitational wave.
Weird. Paper at https://arxiv.org/pdf/1704.07392
If I was younger, I’d love to read that.
To see if it can shed any light on the alternatives of large extra dimensions and/or the possible existence of a parallel 3+1 dimensional braneworld.
For the second one it was pointed out to me that, since gravity leaks into other dimensions, dark matter doesn’t have to reside in our universe. It may exist in a parallel braneworld.