sage
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Comments on Penrose's new book.
I just browsed through Penrose's new book "road to reality" for about an hour in a bookstore. here are some of my personal comments (obviously not very complete since I only read some physics parts of it).
I think there should a clear warning for beginners before reading this book. If you have not learned the subject, be very careful. His treatment is certainly not a fair and balanced account for the status of the research in the field. For example, in the section of beyond the Standard Model, which is a big field now, only an almost completely unknown work is mentioned, ignoring any other developments. He has a lot of cirtisism of string theory. On the other hand, when he talks about loop quantum gravity, everything seems to be very rosy. he does not even mention the problems of LQG.
I think his book should be treated as strictly his personal point of view. I know it is definitely not the widely accepted point of view in the field.
There also seems to be some mistakes on the physics issues in this book. He does not seem to understand the essence of spotaneous symmetry breaking and his critisism of it seems to be wrong. His point of view on renormalization is at best ancient.
I also remeber that some of colleagues in cosmology assured me that many of his point of view on cosmology are also just wrong.
| 发表时间：2005-11-22, 21:45:14 |
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轩轩
发表文章数: 1352
武功等级: 易筋经
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Re: Comments on Penrose's new book.
似乎粒子物理学家多数对penrose的新书有批评态度 他的新书我感觉前面写得比后面要好 后面确实感觉他写的太乏力了 写了8年啊 penrose是一个数学家 他的物理感可能不是很强？ 当然相对论肯定是很好 相对论与粒子物理之间的语言和风格之间的矛盾似乎不能调和 我挺喜欢penrose的文章 他的扭量计划 和抽象指标 看上去 非常优雅 当然不是很物理这确实是事实 广义相对论似乎更象是一门数学：）
总的说来 喜欢数学的人 他的新书是值得一买的：）
witten有300多篇文章,评价他我用2个字:大文豪.
《相对论通俗演义》
i will love you till the null infinity.
| 发表时间：2005-11-22, 23:10:20 |
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sage
发表文章数: 1125
武功等级: 天山六阳掌
(第六重)
内力值: 535/535
Re: Comments on Penrose's new book.
forgot to mention another mistake in Penrose's book,
he believes Cabbibo angle is some angle between strong and weak eigenstates, which is flattly wrong.
| 发表时间：2005-11-22, 23:31:19 |
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HPC
发表文章数: 244
武功等级: 逍遥拳
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Re: Comments on Penrose's new book.
一个人对事物的看法必然与其受到的教育背景以及周边的环境密切相关.
这样一来, 倒有了丰富的思想, 生活因此而变得有意思起来.
我是受到GR这个团体深刻影响的人, 因此对粒子物理学家的很多做法不以为然. 甚至以GR的传统去reformulate它们.
但是对里面的非常重要的思想到是颇为欣赏的, 但对他们陈述问题的方式实在不满意. 哪怕对于已经成熟的理论,也不注意数学的少许严格.
Faith, Fashion and Fancy.
| 发表时间：2005-11-22, 23:34:49 |
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HPC
发表文章数: 244
武功等级: 逍遥拳
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Re: Comments on Penrose's new book.
Penrose对超对称的表述的模糊的不满就可以看作是广义相对论学派的作风。
Faith, Fashion and Fancy.
| 发表时间：2005-11-23, 21:05:55 |
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Omni