What happens at the boundary of a black hole is in confusion and debate. And of course it involves entanglement and QM, and quantum field theory. Suskind who prefers quantum loop gravity in involved:-http://www.nytimes.com/2013/08/13/science/space/a-black-hole-mystery-wrapped-in-a-firewall-paradox.html?nl=todaysheadlines&emc=edit_th_20130813&_r=0-Does Ruth's theory solve the problem?