tiger
Dec1-04, 11:06 AM
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=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>Hi,everyone!\nI have read a quantum field book that massive particles can have three\n\'physical\' polarization states; but massless vector, just like photon\nonly have two because of its zero mass.\nThen it give a sum expression of virtual photon polarizations, it obvious\nthe author only consider two polarizations. I wonder since virtual photon\nhave a nonzero mass (m^2<0), why cann\'t we just construct its polarization\nlike massive particles? Is there some "physical" reason here?\n\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>Hi,everyone!
I have read a quantum field book that massive particles can have three
'physical' polarization states; but massless vector, just like photon
only have two because of its zero mass.
Then it give a sum expression of virtual photon polarizations, it obvious
the author only consider two polarizations. I wonder since virtual photon
have a nonzero mass (m^2<0), why cann't we just construct its polarization
like massive particles? Is there some "physical" reason here?
I have read a quantum field book that massive particles can have three
'physical' polarization states; but massless vector, just like photon
only have two because of its zero mass.
Then it give a sum expression of virtual photon polarizations, it obvious
the author only consider two polarizations. I wonder since virtual photon
have a nonzero mass (m^2<0), why cann't we just construct its polarization
like massive particles? Is there some "physical" reason here?