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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 16 Comments

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 1 Comment

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 2 Comments

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 3 Comments

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 1 Comment

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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