Loop-Quantum Gravity versus String Theory [closed]

Basically asking what were the motives behind each theory. What was it that led physicists toward these ideas?

closed as too broad by John Rennie, JamalS, user1504, Qmechanic♦Jun 6 '14 at 18:01

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• This is far too broad a question to be answered here. There are numerous books and blog posts on the subject. You need to go off and do some reading around the area and come back to us if there are any specific technical issues you need clarifying. – John Rennie Jun 6 '14 at 17:39
• I was basically asking what were the motives behind each theory. What was it that lead physistist toward these ideas? – Numoru Jun 6 '14 at 17:42
• Lee Smolin - The Trouble With Physics', or Three roads to quantum gravity' by the same author. – 299792458 Jun 6 '14 at 17:42
• @New_new_newbie : Feel I now need to promote String Theory in face of Smolin! So 'at' user24176 try reading The Fabric of The Cosmos by Brian Grene. I read it as a first year undergrad and really loved it. I hear there is also a movie now, but I cannot comment on it. Moreover, I believe that one can watch it online, but I'm unsure where. – Flint72 Jun 7 '14 at 9:02