Steve Hsu has started a conversation that closely parallels discussion in Loop Quantum Cosmology regarding black hole bounce. http://infoproc.blogspot.com/2006/08/spacetime-topology-change-and-black.html http://arxiv.org/abs/hep-th/0608175 http://arxiv.org/abs/gr-qc/9908031 http://arxiv.org/abs/hep-th/0103019 In LQC the equation that replaces the classical Friedman or the Wheeler-DeWitt equations has gravity turn out to be repulsive at high densities and many solutions avoid singularity and exhibit a bounce. Ashtekar has pointed to evidence that in the LQC model gravitational collapse and re-expansion can connect two large classical regions of spacetime. http://arxiv.org/abs/gr-qc/0509075 (Class. Quant. Grav.) A black hole can (at least in some circumstances in the LQC model) produce a new region of the universe. The bounce phenomenon is being studied both analytically and by numerical simulations at Penn State. http://arxiv.org/abs/gr-qc/0604013 (Phys. Rev. D) It turns out, in other words, that Martin Bojowald, Abhay Ashtekar, and several collaborators have been making a detailed study of a mechanism by which what Steve Hsu is talking about might actually happen: a quantum gravity mechanism by which a new region of space might expand from the pit of a black hole. This is not something that quantum gravitists put into their model by hand. The bounce phenomenon appeared in a 2001 analysis by Bojowald ("Absence of Singularity in Loop Quantum Cosmology") and a number of LQG papers have been published since then, investigating the subject. Here is a list of 122 papers which cite Bojowald's original "Absence of Singularity in LQC" paper: http://arxiv.org/cits/gr-qc/0102069 These things seem to fit rather nicely together and it is noteworthy that Stephen Hsu seems to be coming to it from an entirely different direction. So I want in this thread to look at what his message is and at some of the material he gives links to.