The state of no working, experimentally validated theory of quantum gravity is a problem for physicists but not the universe. It is okay to have solid working frameworks that make accurate, testable predictions at vastly different scales, and it will be wonderful when a workable, working theory of quantum gravity is discovered. I believe that the Copenhagen Interpretation is also waiting for a solution that goes beyond Feynman’s motto, “shut up and calculate.” Perhaps Quantum Gravity will also point the way to a solution for what underlies Quantum mechanics.

You have benefited a lot, great

I would say it’s a paradigm shift kind of problem. So far we’ve taken classical theories and quantized them. But in the case of gravity, the right thing to do would be to start with quantum mechanics and “classicize” it to get gravity: the other way around of what we’ve been doing so far.

Why? Because Nature is quantum mechanical so we should start quantum mechanical, too.

I don’t think that we have to describe the universe with only one theory. And I think that also because of it, that we can not solve the problem of dark matter. Maybe the universe doesn’t really have only the dimensions that we already know. And if there is more dimensions, maybe there is also more theorys, or more particles, or both, and maybe one day we can explain it all together. And I believe that if there is only one theory, that’s the Strings theory.

I would say in the upcoming future physicist will definitely resolve for quantum gravity. For the time being I would say it is not a problem as they both explain the fundamental frameworks of the universe. But a combination of b0th will definitely lead to greater discoveries.

S Hawking said two. I agree.

There is a chance that none of these theories are perfect through and through so unless we can deduce a solid theory, it is justified for many theories to co-exist. This will allow scientists to work on the theories by learning from each other.

Hello Ladies and Gentlemen,

Allowing for String Theory to explain the uncertainties of gravity are a way to update science in the 1970 era.

We can account for all the science of the strong and weak forces and for electromagnetism, but on it`s own, gravity seems to defy being identified by theories prior to String Theory.

Of the four forces of the universe, String Theory holds tests and predictions necessary to any theoretical model.

The combination of these two biggest principles is one of the biggest problems in my opinion. Each theory describes its respective regime, one for large scales and the other for the subatomic world. Combining these two types of greatness really is a challenge and that is why we are looking for this attempt. Claiming to be correct or not is hasty.