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Philosophical Foundations of Physics

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Ice water on closed timelike curves

By Bryan 6 December 2009 general relativity, philosophy of physics, thermodynamics

Today, let’s kick off our shoes and relax our standards for what counts as a reasonable spacetime. Let’s talk about spacetimes allowing for a certain kind of time travel, called…

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Hyper-intelligent fish and black hole thermodynamics

By Bryan 11 July 2009 general relativity, philosophy of physics, quantum theory, spacetime, thermodynamics

Bill Unruh’s recent collection on black hole analogues begins, Deep beneath the great encircling seas of the Discworld lived a species of hyper-intelligent fish. (Unruh 2007, p.1) Unusual, but inspiring:…

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Why does matter follow geodesics?

By Bryan 6 February 2009 general relativity, spacetime

In the very first lessons on General Relativity, we learn that free particles follow geodesics — the equivalent of straight lines in curved spacetimes. Why? Well, it’s easy to show…

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Two Tough Cases of Underdetermination

By Bryan 27 January 2009 general relativity

John Earman once pointed out two tough cases of underdetermination, neither of which arises in a silly algorithmic way. Today, I’d like to argue for an important difference between these…

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No, there are STILL no deadly mini-black holes!

By Bryan 23 January 2009 general relativity, news, philosophy of physics, quantum gravity

Kentucky, who runs a fantastic blog over at arxivblog.org, has pointed out a new calculation about black hole creation here on earth. The paper (arxiv) suggests that mini-black holes might…

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