PDA

View Full Version : Do gravity wave have to be in normal 3 dimensions or the proposed extra ones ?



nota
2012-Jan-20, 05:46 AM
STRING MAY HAVE EXTRA DIMENSIONS BEYOND X-Y-Z PLUS TIME

if we can't detect gravity waves
could they be hidden in the extra proposed dimensions ?

Tensor
2012-Jan-20, 06:12 AM
STRING MAY HAVE EXTRA DIMENSIONS BEYOND X-Y-Z PLUS TIME

if we can't detect gravity waves
could they be hidden in the extra proposed dimensions ?

That's a bit tricky to answer. Current Quantum Field Theory (QFT) is background dependent. Which means the background, spacetime, doesn't change over the time the process is being analyzed through the quantum equations. In General Relativity(GR), the background changes over time as gravity changes due to particles and energy move in and out of the area where the interactions are taking place. This means that General Relativity is Background Independent. Superstring Theory currently needs perturbative methods, similar to those used by QFT, which means it's Background dependent. Ideally, Superstring Theory has to be Background Independent, meaning it would include gravity. But to do that, it needs to develop non-purturbative methods. Now that you have the background (no pun intended), gravity waves in GR are based in the 3+1 dimension model. To fully understand gravity waves in Superstring Theory, and whether or not they would extend into the other dimensions, requires that Superstring Theory have a fully background independent methods, which it doesn't currently have.

So the long way around answer to your question is, we just don't know right now. Sorry for the length, but I wanted to to let you know the reasons why, not just give you a yes, no, don't know answer.