Hossenfelder: If one adds 7 dimensions of space to our normal three dimensions, then one can describe all of the fundamental forces of nature geometrically. And that sounds like a really promising idea for a unified theory of physics. Indeed, in the early 1980s, the string theorist Edward Witten thought it was intriguing that seven additional dimensions of space is also the maximum for supergravity. However, that numerical coincidence turned out to not lead anywhere. This geometric construction of fundamental forces which is called Kaluza-Klein theory, suffers from several problems that no one has managed to solved.
One can’t help wondering what the notion of many additional dimensions is supposed to do. … By now, you probably get the picture. The side door to “Anything we want to believe is true.”
Some physicists think that information might escape a black hole via an escape route that involves a higher dimension.
The authors hope that their work will “pave the way for methods of testing string theory.” That could come in handy, you never know.
Not if you go by results from the gravitational waves collision. While last year’s discovery of gravitational waves from colliding neutron stars was earth-shaking, it won’t add extra dimensions to our understanding of the universe—not literal ones, at least. University of Chicago astronomers found no evidence for extra spatial dimensions to the universe based on Read More…