Reading, Three Roads to Quantum Gravity, by Lee Smolin.
One of the few simple formula's in the book stunned me. A formula by Unruh, please see page 82. When one accelerates through empty space it is as if out the blue you are surrounded by a "hot" gas. Quoting Smolin: "This effect implies that there is a kind of addendum to Einstein's famous equivalence principle. According to Einstein, a constantly accelerating observer should be in a situation just like an observer sitting on the surface of a planet. Unruh told us that this is true only if the planet has been heated to a temperature that is proportional to the acceleration."
Paperback ISBN: 0465078362
Hardcover ASIN: 0465078354
The entire book is intriguing revelations and concepts of the universe we live in. It is well written and easy to follow. Smolin is trying to integrate all current theoretical work to find the solution to the problem of quantum gravity. Rather than just following his own line of
theory, he is looking at all theories (such as string theory) to truly understand gravity. I truly enjoyed this work!
Topic: My review of Three Roads to Quantum Gravity by Lee Smolin. http://three roads , http://quantum gravity , gravity.com.