作者astroY (astroY)
看板NTUNL
標題僭越了..:p
時間Fri May 17 00:18:58 2002
宇宙中的非線性-吳俊輝
linear system
1.orbit of planets on human-life time scale.
2.R^3/T^2 = const.
GM/R^2=w^2R, w=2π/T
3.Cosmic Microwave Background.
non-linear system
1.solar system-orbits of planets & gaps in asteroid orbit.
2.compact binary system:gravitation radiation.
3.N-body gravitational system:formation of structures in the universe.
4.CMB:SZ-effect, lensing effect,interactions with cosmic defects.
5.cosmic strings:their evolution history from a fractal system in the
4-dimension space-time coordinates.
6.superstring theory:solutions of the Einstein's equation.
L ＿
／ꄠ＼ ＿＿
∕＿＿﹨ ／ ＼
︶
R
L α R^d d:fractal dimension
d=4/3 radom walk
d>4/3 self seeking
content of the universe
P=ωρ
1.matter ω=0
2.radiation ω=1/3
3.dark matter ω=-1 (!)
哀哀 很久沒聽這麼精采得演講
後半段著重於 討論cobe觀測到的CMB微量(10^-5%)起伏變化
以及暴漲(inflation)及宇宙弦(cosmic string)的兩種解釋
神奇呀..不同結晶相變接合處造成的能量陡昇形成弦
卻又與超弦(superstring)理論的弦不同..待查證!
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