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	<title>Lost in Translation</title>
	<link>http://blogs.jhu.edu/pekingli</link>
	<description>Shouts and Silence of pekingli</description>
	<pubDate>Sat, 22 Mar 2008 21:39:58 +0000</pubDate>
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		<title>MSSM-like from string</title>
		<link>http://blogs.jhu.edu/pekingli/archives/2459</link>
		<comments>http://blogs.jhu.edu/pekingli/archives/2459#comments</comments>
		<pubDate>Thu, 29 Nov 2007 22:56:36 +0000</pubDate>
		<dc:creator>pekingli</dc:creator>
		
		<category>Notes</category>

		<guid isPermaLink="false">http://blogs.jhu.edu/pekingli/archives/2459</guid>
		<description><![CDATA[Akin Wingerter&#8217;s talk today is about building MSSM-like model from string compactification.
Gauge hierarchy and family structure of fermions confused a whole generation of people. We are so eager to have a more fundanmental(or upper) understanding that we counldn&#8217;t help building all possible toy model based on imagenation. People like this can get jobs simply because, a real &#8220;top-down&#8221; touch is just impossible. Roughly speaking, everything can [...]]]></description>
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		<title>Destablization</title>
		<link>http://blogs.jhu.edu/pekingli/archives/1923</link>
		<comments>http://blogs.jhu.edu/pekingli/archives/1923#comments</comments>
		<pubDate>Thu, 22 Nov 2007 21:41:30 +0000</pubDate>
		<dc:creator>pekingli</dc:creator>
		
		<category>Notes</category>

		<guid isPermaLink="false">http://blogs.jhu.edu/pekingli/archives/1923</guid>
		<description><![CDATA[This is a talk given by Jon right before Thanksgiving. 
he and Adam Falk&#8217;s work is about one soft breaking term that people previously thought may appear in supersymmetry breaking lagrangian. They study from spontonously breaking way, found goldstino loop always appear along with this soft breaking term, just as pion decay term always appear with mass term(Goldberger-Treiman [...]]]></description>
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		<item>
		<title>Draft</title>
		<link>http://blogs.jhu.edu/pekingli/archives/1214</link>
		<comments>http://blogs.jhu.edu/pekingli/archives/1214#comments</comments>
		<pubDate>Mon, 26 Feb 2007 17:54:35 +0000</pubDate>
		<dc:creator>pekingli</dc:creator>
		
		<category>Notes</category>

		<guid isPermaLink="false">http://blogs.jhu.edu/pekingli?p=1214</guid>
		<description><![CDATA[Today, Gritsan mentioned how to calculate distance defletion inside detector &#8212; chop it into slabs.
This idea is exactly as the way Lorentz got the formula connecting reflection index and scattering amplitude, which further helped Krammers and Kronig got optical theorem.
Optical Theorem connects two things, total cross section, and forward scattering amplitude. Rediculous at the first [...]]]></description>
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		<item>
		<title>Lecture Notes 1  (9.22)</title>
		<link>http://blogs.jhu.edu/pekingli/archives/1136</link>
		<comments>http://blogs.jhu.edu/pekingli/archives/1136#comments</comments>
		<pubDate>Mon, 25 Sep 2006 13:28:33 +0000</pubDate>
		<dc:creator>pekingli</dc:creator>
		
		<category>Notes</category>

		<guid isPermaLink="false">http://blogs.jhu.edu/pekingli/2006/09/25/lecture-notes-1-922/</guid>
		<description><![CDATA[从非相对论量子力学到相对论量子场论。
motivation: 
QFT内含的对称性使得公式表述异常简单，却因存在太多的纵横联系使最简明的物理思想掩盖在华丽外壳之下。既然量子力学作为QFT的极限，后者最简明的思想应该多半显示出来，事实正是如此。
Example:
1。量子力学隐含了镜像反演平方为正负1的事实，并在自由度高于2维将符号赋予玻色，费米（子）
2。非相对论玻色弦振动要求负能量激发态的反粒子解释，并在此解释下自洽。
3。非相对论费米弦振动负能量激发态不仅要求反粒子解释，还要求处理正负频对应，否则中性粒子的实条件不能满足。
homework:
将以上内容推广到高维和相对论情形，注意对称性衍生出的表述简洁，因果律在对称性联系下自然满足。
这揭示了一个事实：离散对称，初条件+连续对称=物理。
bonus:
旋量也许是低维几何最深刻的基础
]]></description>
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