Recent content by shuijing

Hi, is anyone familiar with topological insulator? I read an interesting paper: http://arxiv.org/abs/1703.09365, Black hole as topological insulator Abstract: Black holes are extraordinary massive objects which can be described classically by general relativity, and topological insulators are...

Thanks for the response. I listened to a talk given by Wald about information paradox. His idea is that a pure state envoled into a mixed state doesn't break the unitary. I think that maybe in QFT this idea is better understandable. The formation of black hole is just a phase transition which...

In QFT, which have infinite degree of freedom, there exlst infinite unitary nonequvilent representation. Expecially after phase transition, the two representation are unitary nonequvilent. So can we say that unitary are broken in QFT? Or a pure state can evolved to a mixed state which is a...