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I am aware that that the most researched approach is that of string theory. I have also heard about quantum loop gravity. What other approaches are there to unify gravity and QFT? Also, please include a brief description of that approach, and how it is different from the others.

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This is a textbook example of the kinds of list questions that aren't appropriate for SE sites. But it could perhaps be reworked into an appropriate question without too drastic changes. – David Zaslavsky♦ Dec 18 '12 at 9:41
Possible duplicates: physics.stackexchange.com/q/4340/2451 and links therein. – Qmechanic♦ Dec 18 '12 at 10:33

closed as not constructive by David Zaslavsky♦ Dec 18 '12 at 9:39

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This sounds like an essay question :-)

There are lots and lots of suggestions for quantum gravity, few of which have convinced many. I would start with the list in the Wkikipedia article on quantum gravity and follow the links from there.

My own favourite amongst the also-rans is Causal Dynamical Triangulation because it seems an interesting idea, though I think its chance of success is low.

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