数字游戏-转自李淼的博客
在李淼的博客中发现的一篇文章,蛮有意思的。(PS:李淼可真能灌水的,如果他来牧夫的话,绝对是水王)http://limiao.net.sixxs.org/92
在最新的Polchinski的文章中,他给出一个关系:
http://tex.72pines.com.sixxs.org/latex.php?latex=$%5Crho_V%3De%5E%7B-283.2%7DM_P%5E4$
用自然对数是自然的。他问,我们能不能解释283呢?遗憾的是,我相信,他支持的人择原理也许永远不能解释283,除非用我本帖最后提到的方法。
要了解283.2是怎么来的,我们先看Polchinski用的是什么Planck质量。如果定义http://tex.72pines.com.sixxs.org/latex.php?latex=$M_P%5E2%3D%7B1%5Cover+G%7D$(在自然单位中),我们就有
http://tex.72pines.com.sixxs.org/latex.php?latex=$M_P%3D1.22%5Ctimes+10%5E%7B19%7DGev$
现在,暗能量大约是http://tex.72pines.com.sixxs.org/latex.php?latex=$%5Crho_V%3D%282%5Ctimes+10%5E%7B-3%7Dev%29%5E4$,所以
http://tex.72pines.com.sixxs.org/latex.php?latex=$%5Cln+%7BM_P%5E4%5Cover%5Crho_V%7D%3D%5Cln+%280.61%5Ctimes+10%5E%7B31%7D%29%5E4%3D283.54$
Polchinski得到283.2,因为他忽略了http://tex.72pines.com.sixxs.org/latex.php?latex=$%5Cln1.38%3D0.32$。不论是283.2还是283.5,我们将小数点后面的数看作是高阶修正,所以,最重要的是解释283。
如果Pauli还活着,并且生病的话,估计他的病房号应该是283,而不是137。
Ramanujan说,每一个数都是特别的,283也不例外。首先,我们注意到,283其实是一个素数,介于http://tex.72pines.com.sixxs.org/latex.php?latex=$16%5E2%3D256$和http://tex.72pines.com.sixxs.org/latex.php?latex=$17%5E2%3D289$之间。其实,有一个很漂亮的等式:
http://tex.72pines.com.sixxs.org/latex.php?latex=$283%3D256%2B27%3D4%5E4%2B3%5E3$。
如果我们要将numerology(数字命理学)进行到底,我们说,时空是4维的,所以有http://tex.72pines.com.sixxs.org/latex.php?latex=$4%5E4$,但这不够,因为空间是3维的,还应加上http://tex.72pines.com.sixxs.org/latex.php?latex=$3%5E3$。不过,如果Pauli听到我的理论,一定会气得从地下爬起来。
用Planck质量做单位不一定很有道理,比方我们可以换用约化的Planck质量做单位,其定义是http://tex.72pines.com.sixxs.org/latex.php?latex=$M_p%5E2%3D%7B1%5Cover+8%5Cpi+G%7D$,这样,http://tex.72pines.com.sixxs.org/latex.php?latex=$M_P%3D2.43%5Ctimes+10%5E%7B18%7DGev$。我们就有
http://tex.72pines.com.sixxs.org/latex.php?latex=$%5Cln+%7BM_P%5E4%5Cover%5Crho_V%7D%3D%5Cln%281.215%5Ctimes+10%5E%7B30%7D%29%5E4%3D277.1$。
现在我们的任务是解释277,可怜的Pauli,他不得不从283号病房搬到277号。他聊以自慰的是,277还是一个素数。我现在没有了先前的4维时空和3维空间的理论了,不过,283和277之差是6,一个完全数。并且,277和365天相差是88,多么吉利的数字!
最后我想提一下,人类的平均怀孕期是280天,不论是283还是277,都在一个标准误差范围内。既然要提倡人择原理,将这两个数做比较大概不算太过分 http://limiao.net.sixxs.org/wp-includes/images/smilies/icon_smile.gif
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写好本帖,我用代理到Motl的博客那里走了一遭,他终于停止了无休止的关于政治和全球暖化的长篇大论,给了一点点时间给物理学,下面是他的最新帖子:
As Amanda from SG has reminded me, Joe Polchinski participated at the Solvay Conference and gave an interesting talk about the cosmological constant and the string landscape that you can now see in the written form. I think that he defines very well what the problem is - more precisely, what the three problems are - and what are the two basic categories of explanations of the value of the cosmological constant. I would call these two categories “genuine explanations” and “non-explanations”, but it is a matter of terminology. Many readers consider Joe’s review to be the best available defense of the anthropic reasoning.
The paper is recommended especially to everyone who thinks that the cosmological constant problem is an easy problem. Joe shows how the loops contributing to the Lamb shift couple to soft gravitons which is why you can’t declare the short-distance physics “absent”. Our colleagues who are experts in numerology will surely try to explain why
vacuum energy = exp (-283.2) Mplanck^4
Where does the number 283.2 come from? http://limiao.net.sixxs.org/wp-includes/images/smilies/icon_wink.gif
他最后提到numerology,你看,我已经作了最权威的numerology解释,从此登上民科大师的宝座。 转贴过来的文字丢失了公式,链接打不开……
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又发现链接很怪异,似乎是ipv6到ipv4的桥,于是把域名的最后两个后缀去掉就好了。
[ 本帖最后由 bearcat 于 2008-12-10 20:13 编辑 ] 链接打不开::070821_07.jpg:: ::070821_07.jpg:: 用ipv4的参考这两个链接:
http://limiao.net/92
http://cn.arxiv.org/abs/hep-th/0603249
话说这个文章没啥意思,随便找个数都能搞出点七拼八凑的东西来。
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