As a kid who LOVES science, I am always trying to come up with new inventions, theories, and such...So here's an un-defined physics mystery Part 1:

1) An open question in fundamental physics is the so-called information loss paradox, or black hole unitarity paradox. Classically, the laws of physics are the same run forward or in reverse (T-symmetry). Liouville's theorem dictates conservation of phase space volume, which can be thought of as "conservation of information", so there is some problem even in classical physics. In quantum mechanics, this corresponds to a vital property called unitarity, which has to do with the conservation of probability (it can also be thought of as a conservation of quantum phase space volume as expressed by the density matrix).

2) Why does the predicted mass of the quantum vacuum have little effect on the expansion of the universe?

3) Does nature have more than four spacetime  dimensions? If so, what is their size? Are dimensions a fundamental property of the universe or an emergent result of other physical laws? Can we experimentally "see" evidence of higher spatial dimensions?

4) Is the universe heading towards a Big Freeze, a Big Rip, a Big Crunch or a Big Bounce? Is our universe part of an infinitely recurring cyclic model?

So...I plan on writing a paper about this stuff when I can, and I would like to discuss this....start!