Posted in Geometric Physics Group Meeting on March 28, 2008 | No Comments »
L. Szabadoz will come to NCU.
F. Hehl — P.R.A 77, 022106.
2-D Gravity. (This talk will be held next week.)
Negative Energy (by Jim Nester):
Take a finite region, how to measure the mass of a galaxy?
Brill & Deser
Homogeneous Cosmology — Equation can be homogeneous but the solution can’t be.
Posted in Geometric Physics Group Meeting on January 25, 2008 | No Comments »
1. Bianchi Cosmology: homogeneous (but not isotropic)
2. We need the model investigated to be isotropic.
3. Find some special cases for isotropic in Bianchi Cosmology.
4. If we classified the 9 types of Bianchi Cosmology, there are 2 classes:
Class A: Type I, II, VIII, IX.
Class B: Type III to VII_{h}
5. Few cases can be isoptropic:
Bianchi I [...]
Posted in Geometric Physics Group Meeting on January 11, 2008 | No Comments »
2008, Jan 3, NCU Relativity and Geometric Physics Group Meeting 討論的主題是由Jim Nester 主講: Spinor’s repesentation: idempotents and projections
Note: I hope I can make a Latex edition for this topic.
Posted in Geometric Physics Group Meeting on December 28, 2007 | No Comments »
2007, Dec 27, NCU Relativity and Geometric Physics Group Meeting 討論的主題是由Teofilo Vargas 主講: P. Davis 的 ”Anthropic Principle”。
會中提到了:
Brandon Carter: “Anthropic Principle in Cosmology“
P. Davies: Cosmic Jackpot
Barrow-Tipler: The Anthropic Cosmological Principle. Oxford Univ. Press. ISBN 0-19-282147-4.
這是一個很大的題目，可以用物理學、哲學、形上學各種角度切入，要列舉的參考文獻太多了…
李淼老師在科學與信仰的博文中評論了P. Davies的文章，從這裡面可以找到很多相關文章。另外，在不只一個世界中也對M. Tegmark的平行宇宙多所著墨。
這個題目我還沒能有什麼評論，得爬在更多的巨人身上才能看得更遠。
Posted in Geometric Physics Group Meeting on December 19, 2007 | No Comments »
2007, Dec 13, NCU Relativity and Geometric Physics Group Meeting 討論的主題是由Teofilo Vargas 主講: M. Tegmark 的 ”On the dimensionality of spacetime”。
會中提到了3篇文章:
Barrow-Tipler
M. Tegmark (C.Q.G. 14 L69, (1997)): ”On the dimensionality of spacetime”
I. M. Freeman (Am. J. Phys. 37, 1222, (1969)): “Why is space three dimensional? Based on B¨uchel …”
這是一個有趣的題目…。
後來研究了一下 M. Tegmark，他寫了幾篇有趣的文章：”Shut up and calculate“、”Many lives [...]
