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'harlequin and ivy' posted by Little green man - 31/03/2009, 01:34:29
'Did he just copy&paste the faces? Srsly. (N/T)' posted by Nemi - 31/03/2009, 11:08:29
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呵呵：我不太理è§
£çš„就是off shell
呵呵：我不太理解的就是off shell的光子，因为K^2=0是这个内线传播子的奇点，所以这些光子必须off shell，这样内线所在的区域是否满足能量守恒？从wiki上找到的一段话，A common mooesnccptiin about off shell sets is that they violate energy conservation law while in fact they do not – because energy can not be mathematically defined over an arbitrary small time period (see uncertainty principle). The longer the time within which energy has to be defined, the more accurately it can be defined. Therefore, the energy of a virtual particle is an arbitrary value allowed by the uncertainty principle.感觉这种解释有点回避问题。
(VISITOR) AUTHOR'S NAME
John

MESSAGE TIMESTAMP
17 december 2014, 11:00:52

AUTHOR'S IP LOGGED
117.169.1.49



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