Recent content by lfighter

There're lots of work trying to calculate the properties of condensed matter using an asymtotically AdS black hole. However, I think all these attempts lack a proof, and what they actually do is just pick a small part off the whole curve and claim this part gives the correct result.

This is briefly explained in Peter West's book Introduction to Supersymmetry and Supergravity.

Actually I prefer Bousso's statement that the cloning paradox and entanglement paradox don't exist at all(http://arxiv.org/abs/1207.5192). No observer can see both of the qubits, so it does not contradict no cloning principle. This is the 'observer complementarity'.

Lee Smolin actually wish to combine string theory and LQG together, or form a novel theory that have both feature. But this is very very hard.

You don't know what Witten is interested in and why. One month ago he wrote a condensed matter theory paper with Shou-Cheng Zhang and Xiao-Liang Qi(http://arxiv.org/abs/1206.1407). It's hard to predict his next move.

A non perturbative vacuum may be topologically different from the trivial or ordinary vacuum. That is, one cannot use a topologically trivial transformation(homotopic to identical mapping) to transform it to the trivial vacuum. You can read some references on instanton to get more information.

There's a view point that a spin-2 field in quantum field theory has to generate the general relativity(See Nima's lecture at Pitp 2011, IAS). Maybe this is not satisfying. A novel approach by Verlinde is gravity may have an entropic origin. However, this theory is far from well-developed.