Singularity at the Demise of a Two-Dimensional Black Hole


Justin Feng


May 6, 2024




Room 7S1


In this talk, I consider the conformal diagram for a 1+1 dimensional evaporating black hole in a "baby universe" scenario, demonstrating that the "pinch off" point is in fact a kind of quasiregular singularity characterized by points possessing two future-directed light cones and two past-directed light cones. Such singularities appear in the 1+1 trousers spacetime, and the 1+1 evaporating black hole is in fact conformal to a region of the latter. I then discuss a class of emergent Lorentz signature theories, and argue that they can provide a microscopic description for these singularities.


Justin Feng is a Junior Fellow at LeCosPA, working on a variety of topics related to General Relativity. He got his undergraduate degree at the University of Irvine and his PhD at the University of Texas, Austin. He held postdoctoral research positions at UT, Austin and the University of Lisbon, before joining LeCosPA in 2023.

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