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Riemann tensor in a 2-d curved space

Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 19; Problem P19.6.

Here’s another example of the Riemann tensor… 94 more words

Physics

Evolution of the bits

Last week, I had ordered ‘Programming the universe’ by Seth Lloyd. Partly because I have read about him and listened to his online talks earlier, also partly inspired by the reference to him by Scott Aaronson, whose… 522 more words

Riemann tensor in 2-d flat space

Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 19; Problem P19.5.

Another example of the Riemann tensor in a 2-d space. 80 more words

Physics

Relativity Carefully Rebuilds Rollout for Paul Walker's 'Brick Mansions'

Paul Walker’s sudden death in an automobile crash in November was devastating to his millions of fans. It also presented a challenge for Relativity, distributor of action movie “Brick Mansions,” which had been scheduled for a February release. 223 more words

News

Ricci tensor and curvature scalar

Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 19; Box 19.5, Problem P19.1.

We can form contractions over the indices of the… 181 more words

Physics

The Bianchi identity for the Riemann tensor

Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 19; Box 19.4.

Another relation of the Riemann tensor involves the covariant derivative of the tensor, and is known as the Bianchi identity (actually the second Bianchi identity; the first identity is the… 161 more words

Physics

Science is Not As Easy As You Think: Underdetermination Edition

What I’m about to claim will probably either come as a shock or confirm long-held suspicions: the scientific method—that system of coming up with and then experimentally testing hypotheses that we learned in middle school—is… 718 more words

Pop Philosophy