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  Why do we need a theory of quantum gravity?

+ 2 like - 2 dislike
1595 views

Why do we need a theory of quantum gravity?

Why can't gravity be classical, while matter and the other fundamental forces be quantum in nature?

asked May 12, 2015 in Closed Questions by Rawsha [ revision history ]
closed May 13, 2015 as per community consensus
Most voted comments show all comments

@Prathyush it's no way a great question,  the correct answers are given on the linked duplicate, but more importantly - it's a duplicate.

@Prathush please look at the revision history. The original version was  a plainly obvious layman question, which is really not suitable for PO.

Also, to cast a "Leave Open" vote you have to downvote the closevote both me and @Dimension10 linked to. Just posting a comment here does not achieve this.

@Upvoters and otherw who think the question should not be closed can vote to reopen here.

I disagree with the down votes, as a lay man, but I respect the integrity of this forum.

However, I would argue that this question is way beyond "popular". Answers and comments would presumably be valuable to this forum. I also believe that the answer is arguably more diffficult than appropriate for a popular science  forum. Indeed, how many really really do understand these two theories? Although I am not a physicist (I'm a physician and statistician) I would try to grasp a non-popular answer.

@Rawsha It is expected that you have some familiarity with both Quantum field theory and General Relativity before you can ask this question, even to remotely try and understand it. Without that kind of effort it is simply futile to talk about this. And listening to video lectures for 30hrs simply does not count. 

I will answer the question(modified) to the best of my knowledge. The simplest reason to search for a theory of QG is because there are domains of experiences that in principle can be created in out universe that we cannot explain.

For instance when one studies quantum field theory on the background geometry of a black hole it becomes apparent that black holes evaporate thermally.(Along with having an entropy proportional to their area.) 

We among many things want to understand how to describe such a process. Certainly this situation can be created in the universe(atleast in principle)

Most recent comments show all comments

Duplicate of http://physicsoverflow.org/8828, and voting to close as such.

@Dimension10 I am not sure how wise it was to edit the question into a better form, if we want to close it (as quick as possible) anyway. In the original version it was plainly visible that it is a popular question apart from possibly a duplicate...

But it is probably not too important in this case, I am not sure.





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