Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 19; Problem P19.9.
Using the Riemann tensor, we can get an idea of the force felt by someone falling into a black hole. 399 more words
Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 19; Problem P19.8.
The component of a four-vector along a… 466 more words
A new article in the Chronicle of Higher Education (http://chronicle.com/article/Is-Philosophy-Obsolete-/145837/) uses the old Einstein-Putnam-Penrose argument to help show that philosophy is still needed, because science by itself has such a weird idea of time (therefore philosophy must deal with the “appearance” or “manifest image” of time). 341 more words
Johnny and Phil were practically household names in my family. I was first introduced to them when I was still in diapers via Silly Wizard (1970-1988) and also through Relativity, the 1985 Scots-Irish quartet along with Tríona Ní Dhomhnaill and Mícheál Ó Domhnaill (brother and sister). 172 more words