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Philosophical Foundations of Physics

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Can Time Unfold in the Wrong Direction?

By Bryan 10 March 2009 philosophy of physics, spacetime, time 11 Comments

The unfolding of time is typically described as a sequence of spatial regions: one region of space gets realized, and then another, and then another. For example: consider a region…

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How to Create a Closed Timelike Curve

By Bryan 9 March 2009 funky, spacetime, time 1 Comment

Time along the vertical axis; space along the horizontal…. Voila! And now, how to travel to the past…. Soul Physics is authored by Bryan W. Roberts. Thanks for subscribing. Want…

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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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Geneva Summer School in Philosophy of Physics

By Bryan 22 September 2008 conferences, philosophy of physics, spacetime No Comments

Read About It Here. The Geneva Summer School in Philosophy of Physics, 2008 was a 1-week intensive summer school in the middle of the Swiss alps. This year, scholars and…

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Rotating Discs in GR: Part I

By Bryan 14 July 2008 general relativity, spacetime 3 Comments

Introduction. Craig Callender (2001) and Jeremy Butterfield (2004) have recently suggested that the Rotating Disc Argument (RDA) fails in General Relativity. I argue that this conclusion is wrong: two recharged…

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