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Noether theorem |
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| Apr7-04, 07:46 AM | #1 |
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Noether theorem
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no,location=no, scrollbars=yes,resize=yes,status=no,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Can anyone think of classical field theory without Noether theorem ?\nAnd can we talk about existence of field theory before Noether theorem ?\nS.Wienberg point 1927 as the birth date of field theory, correlate with Dirac works.\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>Can anyone think of classical field theory without Noether theorem ?
And can we talk about existence of field theory before Noether theorem ? S.Wienberg point 1927 as the birth date of field theory, correlate with Dirac works. |
| Apr7-04, 08:05 AM | #2 |
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<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no,location=no, scrollbars=yes,resize=yes,status=no,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\n\n\nAlexander Kubelsky wrote:\n\n\\> Can anyone think of classical field theory without Noether theorem ?\n\\> And can we talk about existence of field theory before Noether theorem ?\n\\> S.Wienberg point 1927 as the birth date of field theory, correlate with Dirac works.\n\nIMO too much is made of this topic and a more or less simple result is\nmade to seem mysterious. The answer is, to the extent a part of physics\nis expressible by a variational principle, then the ideas of Noether\nwill be important. Every real field theory I know of is expressible that\nway.\n\nField theory proper began equally with Dirac, Jordan, and Pauli. The\npapers are\n\nDirac, Proc. Roy. Soc. London A, 114 (1927) p.243, 710\nJordan and Pauli, Zeits. f. Physik 47 (1928) p. 151\n\nThe formulation of quantum electrodynamics followed in three papers from\n1929-1931:\n\nPauli and Heisenberg, Zeits. f. Physik 56 (1929) p. 1\nPauli and Heisenberg, Zeits. f. Physik 59 (1930) p. 169\nFermi, Rev. Mod. Phys. 4 (1931) p. 131\n\nThe positron was then discovered in the lab and it\'s been all downhill\nsince :)\n\nPascual Jordan is an interesting case. He was certainly on the same\nlevel as the other famous inventers of quantum theory, but got mixed up\nin German politics and was besmirched with Naziism (in his case there is\nno plausible deniability, as with Heisenberg). Today he is a forgotten name.\n\n-drl\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>Alexander Kubelsky wrote:
> Can anyone think of classical field theory without Noether theorem ? > And can we talk about existence of field theory before Noether theorem ? > S.Wienberg point 1927 as the birth date of field theory, correlate with Dirac works. IMO too much is made of this topic and a more or less simple result is made to seem mysterious. The answer is, to the extent a part of physics is expressible by a variational principle, then the ideas of Noether will be important. Every real field theory I know of is expressible that way. Field theory proper began equally with Dirac, Jordan, and Pauli. The papers are Dirac, Proc. Roy. Soc. London A, 114 (1927) p.243, 710 Jordan and Pauli, Zeits. f. Physik 47 (1928) p. 151 The formulation of quantum electrodynamics followed in three papers from [itex]1929-1931:[/itex] Pauli and Heisenberg, Zeits. f. Physik 56 (1929) p. 1 Pauli and Heisenberg, Zeits. f. Physik 59 (1930) p. 169 Fermi, Rev. Mod. Phys. 4 (1931) p. 131 The positron was then discovered in the lab and it's been all downhill since :) Pascual Jordan is an interesting case. He was certainly on the same level as the other famous inventers of quantum theory, but got mixed up in German politics and was besmirched with Naziism (in his case there is no plausible deniability, as with Heisenberg). Today he is a forgotten name. [itex]-drl[/itex] |
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