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David_Gerard comments on Boltzmann Brains and Anthropic Reference Classes (Updated) - Less Wrong
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Do you mean, they have written about Boltzmann brains, or that they actually raise concerns similar to those you raise in this post? A string of names does not actually assert the latter.
All of the physicists I named, except Hartle, have raised concerns about the Boltzmann brain problem threatening observational cosmology. Hartle has argued against the SSA, so he thinks Boltzmann brains aren't problematic. I probably shouldn't have included his name in the list. Still, the fact that he has published on the issue suggests that he regards it as more than just nonsense.