Stephen Hawking (1942-2018)

Roger Penrose writes in the Guardian, providing a scientifically precise summary of Hawking’s accomplishments as a physicist (worth reading in full at the link). Penrose and Hawking collaborated to produce important singularity theorems in general relativity in the late 1960s. Here is a nice BBC feature: A Brief History of Stephen Hawking. The photo above …

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Black Hole Memory and Soft Hair

A recent paper by Hawking, Perry, and Strominger (Soft Hair on Black Holes) proposes a new kind of soft hair (i.e., soft gravitons or photons) on the black hole horizon. This hair is related to recent results on BMS symmetries and soft (zero) modes by Strominger and collaborators. The existence of an infinite number of …

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