s******y
发帖数: 2 | 1 英刊评出有史以来最杰出的十位物理学家
新华社伦敦１１月２９日电（记者毛磊）英国《物理世
界》杂志新推出一期千年特刊，评选出了有史以来１０名最
杰出的物理学家，其中名列榜首的是“相对论之父”爱因斯
坦。
该杂志在世界范围内对１００余名一流物理学家进行了
问卷调查。根据投票结果，十大物理学家中名列二至七位的
分别为英国的牛顿和麦克斯韦、丹麦的玻尔、德国的海森伯
格、意大利的伽利略和美国的费曼。英国的狄拉克和奥地利
的薛定谔以同样的票数并列第八位，紧随其后的是新西兰籍
物理学家卢瑟福。
在当代物理学家眼中，爱因斯坦的狭义和广义相对论、
牛顿的运动和引力定律再加上量子力学理论，是有史以来最
重要的三项物理学发现。接受调查的物理学家们还列举了下
个千年有待解决的一些主要物理学难题，如量子引力、聚变
能、高温超导体和太阳磁场等。大多数物理学家在调查中都
认为，在可预见的将来，并不存在所谓理论物理学的终结。 | l*********s
发帖数: 10 | 2 Nonsense!
Had Feymann made more contribution to Physics than Dirac?
Feymann's most important contribution to Physics is his path
integral formulism for quantum mechanics and fields, but the
idea stemed from Dirac. How come he got a position ahead
of Dirac?
I think it's because he is the most important native American
physicist, and nowadays American is the centre of Science.
In fact, C N Yang made more important contribution than him,
but he is a American-Chinese, so... :(
【在 s******y 的大作中提到】
: 英刊评出有史以来最杰出的十位物理学家
: 新华社伦敦１１月２９日电（记者毛磊）英国《物理世
: 界》杂志新推出一期千年特刊，评选出了有史以来１０名最
: 杰出的物理学家，其中名列榜首的是“相对论之父”爱因斯
: 坦。
: 该杂志在世界范围内对１００余名一流物理学家进行了
: 问卷调查。根据投票结果，十大物理学家中名列二至七位的
: 分别为英国的牛顿和麦克斯韦、丹麦的玻尔、德国的海森伯
: 格、意大利的伽利略和美国的费曼。英国的狄拉克和奥地利
: 的薛定谔以同样的票数并列第八位，紧随其后的是新西兰籍
| q*****m
发帖数: 73 | 3
The idea is stolen from Schwinger. My boss knows that
very well.
【在 l*********s 的大作中提到】
: Nonsense!
: Had Feymann made more contribution to Physics than Dirac?
: Feymann's most important contribution to Physics is his path
: integral formulism for quantum mechanics and fields, but the
: idea stemed from Dirac. How come he got a position ahead
: of Dirac?
: I think it's because he is the most important native American
: physicist, and nowadays American is the centre of Science.
: In fact, C N Yang made more important contribution than him,
: but he is a American-Chinese, so... :(
| s**e
发帖数: 103 | 4
Agree. But Feynman is very popular, that's why. I think one had better judge
a person's contribution some a hundred years later, otherwise people will
tends to think what is happening recently of more importance.
BTW, C.N.Yang's contribution not necessarily more improtant than Feynman.
But he is a Chinese, so maybe you like him more. :o)
【在 l*********s 的大作中提到】
: Nonsense!
: Had Feymann made more contribution to Physics than Dirac?
: Feymann's most important contribution to Physics is his path
: integral formulism for quantum mechanics and fields, but the
: idea stemed from Dirac. How come he got a position ahead
: of Dirac?
: I think it's because he is the most important native American
: physicist, and nowadays American is the centre of Science.
: In fact, C N Yang made more important contribution than him,
: but he is a American-Chinese, so... :(
| s**e
发帖数: 103 | 5
really? I thought Feynman got it when he was at Princeton after reading a
paper of Dirac. Anyway, can you tell me your boss' story?
To me, every masters of that time, such as Dirac, Bethe, Weisskopf, Pauli
Heisenberg etc. has some correct ideas about QFT. But Feynman, Schwinger and
Tomonaga are the ones who really made it. Just like there ideas resemble to
relativity before Einstein,
【在 q*****m 的大作中提到】
:
: The idea is stolen from Schwinger. My boss knows that
: very well.
| b****d
发帖数: 30 | 6 Feymann Rules is cool, without it, High Energy Physics can barely have any
graduate students, so its significance can never be underestimated :)
【在 l*********s 的大作中提到】
: Nonsense!
: Had Feymann made more contribution to Physics than Dirac?
: Feymann's most important contribution to Physics is his path
: integral formulism for quantum mechanics and fields, but the
: idea stemed from Dirac. How come he got a position ahead
: of Dirac?
: I think it's because he is the most important native American
: physicist, and nowadays American is the centre of Science.
: In fact, C N Yang made more important contribution than him,
: but he is a American-Chinese, so... :(
| q*****m
发帖数: 73 | 7 Schwinger has the idea first. But he is a quiet man
while Feynman is more pupular. 'Schwinger will never
forgive Feynman of stolen his ideas' is what my boss
told me.
I dislike Feynman since then.
【在 s**e 的大作中提到】
:
: really? I thought Feynman got it when he was at Princeton after reading a
: paper of Dirac. Anyway, can you tell me your boss' story?
: To me, every masters of that time, such as Dirac, Bethe, Weisskopf, Pauli
: Heisenberg etc. has some correct ideas about QFT. But Feynman, Schwinger and
: Tomonaga are the ones who really made it. Just like there ideas resemble to
: relativity before Einstein,
| s**e
发帖数: 103 | 8
what idea? You mean calculation of g-2 or path integral?
【在 q*****m 的大作中提到】
: Schwinger has the idea first. But he is a quiet man
: while Feynman is more pupular. 'Schwinger will never
: forgive Feynman of stolen his ideas' is what my boss
: told me.
: I dislike Feynman since then.
| s**t
发帖数: 2 | 9 这些人最早的是伽利略吧?
那以前的人白活了? 至少该有亚里斯多德, :)
【在 s******y 的大作中提到】
: 英刊评出有史以来最杰出的十位物理学家
: 新华社伦敦１１月２９日电（记者毛磊）英国《物理世
: 界》杂志新推出一期千年特刊，评选出了有史以来１０名最
: 杰出的物理学家，其中名列榜首的是“相对论之父”爱因斯
: 坦。
: 该杂志在世界范围内对１００余名一流物理学家进行了
: 问卷调查。根据投票结果，十大物理学家中名列二至七位的
: 分别为英国的牛顿和麦克斯韦、丹麦的玻尔、德国的海森伯
: 格、意大利的伽利略和美国的费曼。英国的狄拉克和奥地利
: 的薛定谔以同样的票数并列第八位，紧随其后的是新西兰籍
| p**h
发帖数: 99 | 10 所以, 爱因斯坦他爸妈也应算上.
【在 s**t 的大作中提到】
: 这些人最早的是伽利略吧?
: 那以前的人白活了? 至少该有亚里斯多德, :)
| | | f*******d
发帖数: 339 | 11
I suspect your boss is a student of Schwinger?
The idea of path integral is developed by Feynman. Schwinger so disliked
this idea that later he developed his own version which is called
quantum action principle, but I think no one uses it (at least I never heard
anyone use it).
Of course, Dirac get the path integral formula earlier than Feynman, but
he probabily did not recognize its importance or even physical meaning.
This is like Lorentz and Poincare
developed the Lorentz transformation befo
【在 s**e 的大作中提到】
:
: what idea? You mean calculation of g-2 or path integral?
| g***s
发帖数: 30 | 12 go shi, aristotle 算什么物理学家
根本没有一个科学的态度
【在 s**t 的大作中提到】
: 这些人最早的是伽利略吧?
: 那以前的人白活了? 至少该有亚里斯多德, :)
| b****d
发帖数: 30 | 13 galileo莱赣衡琌材瞶厩產
【在 g***s 的大作中提到】
: go shi, aristotle 算什么物理学家
: 根本没有一个科学的态度
| d*n
发帖数: 137 | 14
yes, I think so.
I think Laudau contributed more than Feynman and Yang.
Laudu level:
1. Newton, Einstein
2.Dirac Bohr, Shrodingger,Heisenbur
2.5 Laudau
3 Feynman etc
Above given by Laudau
4 Yang, Li, etc
【在 s**e 的大作中提到】
:
: what idea? You mean calculation of g-2 or path integral?
| s**e
发帖数: 103 | 15
I don't think so. Landau is very smart, but contribution bigger than Feynman?
【在 d*n 的大作中提到】
:
: yes, I think so.
: I think Laudau contributed more than Feynman and Yang.
: Laudu level:
: 1. Newton, Einstein
: 2.Dirac Bohr, Shrodingger,Heisenbur
: 2.5 Laudau
: 3 Feynman etc
: Above given by Laudau
: 4 Yang, Li, etc
| s**e
发帖数: 103 | 16
what do you mean by scientific attitude? everything has a beginning, probably
for the people thousands years later, everybody now don't have a scientific
attitude.
【在 g***s 的大作中提到】
: go shi, aristotle 算什么物理学家
: 根本没有一个科学的态度
| s******y
发帖数: 202 | 17
是压, 所以他们都不是物理学家!
【在 s**e 的大作中提到】
:
: what do you mean by scientific attitude? everything has a beginning, probably
: for the people thousands years later, everybody now don't have a scientific
: attitude.
| l*********s
发帖数: 10 | 18 I dare myself to conjecture that although Dirac is the
first one who have the idea of Path Integral Formulism
of Quantum Mechanics and Fields, but since he haa already
got his Canonical Quantization Formulism, why bother to
set up another "equavelent" one? So he left it to the
other Physicists, and Feynman is the lucky one who picked
up the idea and fulfiled it. After all, the first time
Path Integral Formulism show its power is in the proving
of renormalizability of Gauge Fields (1999 Noble Pri
【在 f*******d 的大作中提到】
:
: I suspect your boss is a student of Schwinger?
: The idea of path integral is developed by Feynman. Schwinger so disliked
: this idea that later he developed his own version which is called
: quantum action principle, but I think no one uses it (at least I never heard
: anyone use it).
: Of course, Dirac get the path integral formula earlier than Feynman, but
: he probabily did not recognize its importance or even physical meaning.
: This is like Lorentz and Poincare
: developed the Lorentz transformation befo
| l*********s
发帖数: 10 | 19 As for comparison of C N Yang and Feynman, my judgement is
irrespetive of race. Actually Yang's contribution is more
fundamental (important) than Feynman's. Yang's Gauge Theory
set up the framework to describe and unify elementary
interactions, which is the supreme goal of Physicists's
reserach.
【在 d*n 的大作中提到】
:
: yes, I think so.
: I think Laudau contributed more than Feynman and Yang.
: Laudu level:
: 1. Newton, Einstein
: 2.Dirac Bohr, Shrodingger,Heisenbur
: 2.5 Laudau
: 3 Feynman etc
: Above given by Laudau
: 4 Yang, Li, etc
| l*********s
发帖数: 10 | 20 Schwinger is the first one sloved the problem of renormalization
of QED, and Feynman also did it after his work by using his path
integral method, but Feynman is so popular that almost everyone
forget it's Schwinger who solved the problem first, this lead
Schwinger's unhappy about Feynman.
【在 f*******d 的大作中提到】
:
: I suspect your boss is a student of Schwinger?
: The idea of path integral is developed by Feynman. Schwinger so disliked
: this idea that later he developed his own version which is called
: quantum action principle, but I think no one uses it (at least I never heard
: anyone use it).
: Of course, Dirac get the path integral formula earlier than Feynman, but
: he probabily did not recognize its importance or even physical meaning.
: This is like Lorentz and Poincare
: developed the Lorentz transformation befo
| | | A**z
发帖数: 184 | 21 爱隐私谈虽然NB，不过我觉得牛顿更伟大，如过让我评，
我会把他们两个的位置换一下。
【在 s******y 的大作中提到】
: 英刊评出有史以来最杰出的十位物理学家
: 新华社伦敦１１月２９日电（记者毛磊）英国《物理世
: 界》杂志新推出一期千年特刊，评选出了有史以来１０名最
: 杰出的物理学家，其中名列榜首的是“相对论之父”爱因斯
: 坦。
: 该杂志在世界范围内对１００余名一流物理学家进行了
: 问卷调查。根据投票结果，十大物理学家中名列二至七位的
: 分别为英国的牛顿和麦克斯韦、丹麦的玻尔、德国的海森伯
: 格、意大利的伽利略和美国的费曼。英国的狄拉克和奥地利
: 的薛定谔以同样的票数并列第八位，紧随其后的是新西兰籍
| s**********i
发帖数: 711 | 22
it is for the most excellent? IMO, einstein is the most excellent one,
but newton contributed much more than einstein, and is the greatest.
【在 A**z 的大作中提到】
: 爱隐私谈虽然NB，不过我觉得牛顿更伟大，如过让我评，
: 我会把他们两个的位置换一下。
| l***e
发帖数: 33 | 23
~~~~~~~~~~
是不是excellent, 那得看和谁比, 怎么比. 例如说如果把
牛顿的流数法和莱布尼兹的微积分相比, 那也就是so so而已.
牛顿和莱布尼兹之争是数学史上著名的公案. 我记得我读过的一本书上提过,
欧洲(or 英国)的数学家由于固执地坚持流数法, 其数学水平落后先进水平几十年
(or 十几年?). 其中一些细节我记不清了. 但大意如此.
~~~~
*shrug | m*****e
发帖数: 207 | 24 Leibniz's notation was so important :))
【在 l***e 的大作中提到】
:
: ~~~~~~~~~~
: 是不是excellent, 那得看和谁比, 怎么比. 例如说如果把
: 牛顿的流数法和莱布尼兹的微积分相比, 那也就是so so而已.
: 牛顿和莱布尼兹之争是数学史上著名的公案. 我记得我读过的一本书上提过,
: 欧洲(or 英国)的数学家由于固执地坚持流数法, 其数学水平落后先进水平几十年
: (or 十几年?). 其中一些细节我记不清了. 但大意如此.
: ~~~~
: *shrug
| f*******d
发帖数: 339 | 25
What you said is simply unture. Just ask anyone who know QED the question
"who invented QED renormalization", I bet the answer is "Tomonaga, Schwinger
and Feynman", or "Schwinger and Feynman". Maybe some people forget that
it is Tomonaga who did it before both Schwinger and Feynman, but no one
would
forget Schwinger's contribution. Schwinger was unhappy because
he does not have the fame of Feynman, but Feynman did not steal
any idea from Schwinger, and path integral is Feynman's contribution wh
【在 l*********s 的大作中提到】
: Schwinger is the first one sloved the problem of renormalization
: of QED, and Feynman also did it after his work by using his path
: integral method, but Feynman is so popular that almost everyone
: forget it's Schwinger who solved the problem first, this lead
: Schwinger's unhappy about Feynman.
| s**e
发帖数: 103 | 26
at least now, people are thinking gauge theory is not enough for us to
bring in gravity.
【在 l*********s 的大作中提到】
: As for comparison of C N Yang and Feynman, my judgement is
: irrespetive of race. Actually Yang's contribution is more
: fundamental (important) than Feynman's. Yang's Gauge Theory
: set up the framework to describe and unify elementary
: interactions, which is the supreme goal of Physicists's
: reserach.
| f*******d
发帖数: 339 | 27
general relativity is also a gauge theory.
【在 s**e 的大作中提到】
:
: at least now, people are thinking gauge theory is not enough for us to
: bring in gravity.
| s**e
发帖数: 103 | 28
In some sense, but not a gauged quantum field theory. In order to have a
quantum theory with gravity, one may need things other than gauge symmetry.
【在 f*******d 的大作中提到】
:
: general relativity is also a gauge theory.
| f*******d
发帖数: 339 | 29
Not "in some sense", general relativity is a full gauge field
theory, the only thing is that it is not a quantum theory, but that have
nothing to do with gauge or not.
【在 s**e 的大作中提到】
:
: In some sense, but not a gauged quantum field theory. In order to have a
: quantum theory with gravity, one may need things other than gauge symmetry.
| s**e
发帖数: 103 | 30
anyway, my point is that gauge theory may not be able to solve the quantum
gravity problem for us, we need new principls.
【在 f*******d 的大作中提到】
:
: Not "in some sense", general relativity is a full gauge field
: theory, the only thing is that it is not a quantum theory, but that have
: nothing to do with gauge or not.
| | | s**e
发帖数: 103 | 31
let me explain my 'in some sense'. Purely classically, if you want to view it
as a field theory, then the general coordinate transformation induce a gauge
group. But you can also view it as the geometry of the space time, then there
is no point to talk about gauged field theory.
【在 f*******d 的大作中提到】
:
: Not "in some sense", general relativity is a full gauge field
: theory, the only thing is that it is not a quantum theory, but that have
: nothing to do with gauge or not.
| f*******d
发帖数: 339 | 32
Even then, there are gauge choices inside GR (heard about synchronous gauge,
conformal gauge, etc.?). Furthermore, what is gauge field? Isn't it some
connections on fibre bundles, according to Yang's new understanding? In that
sense, even the Yang-Mills field is geometry.
theory? According to Yang's more recent view, it is
【在 s**e 的大作中提到】
:
: let me explain my 'in some sense'. Purely classically, if you want to view it
: as a field theory, then the general coordinate transformation induce a gauge
: group. But you can also view it as the geometry of the space time, then there
: is no point to talk about gauged field theory.
| s**e
发帖数: 103 | 33
My point is general relativity does not need gauge symmetry as a guiding principle.
you can call it conformal gauge, I can call it conformal frame.
gauge symmetry is a very strong principle that guide us through the building
of standard model (and some extensions) of particle physics. But it seems not
powerful enough to give us a qunatum gravity. and whatever it can say about
the classical gravity, we don't necessarily need it to reach the same
conclusion.
and there are other symmtries that n
【在 f*******d 的大作中提到】
:
: Even then, there are gauge choices inside GR (heard about synchronous gauge,
: conformal gauge, etc.?). Furthermore, what is gauge field? Isn't it some
: connections on fibre bundles, according to Yang's new understanding? In that
: sense, even the Yang-Mills field is geometry.
: theory? According to Yang's more recent view, it is
|
|
