这是一位做弦论的同学在我们系上所蒐集的物理笑话 -- The following quotes are either from me, or from people I know. "Jump off the roof; that'll teach you about gravity!" - in reference to what one should say to a mathematician trying to learn general relativity. "That'll probably be less painful than reading Wald." - as a response to the quote directly above. "No no no; it's a simple matter of cohomology" - one physicist to another after a talk "I'll make a tensor out of you." - whispered by a grad student at the board trying to explain how to convert the levi-civita tensor density into a tensor. "It's some curve-fitting bullshit" - in reference to using thermodynamics to model economics. "Is canonical momentum momentum that is fired out of a cannon?" - a grad student at one of my review sessions for a mechanics final from http://www.joshphysics.com/quotes/ -- 补上一点实用的点 有个很不错的物理社群，上面有很多高手可以回答大家的问题 有时候我自己读QFT读不懂时就上来查，相当有帮助 http://physics.stackexchange.com/questions/tagged/quantum-field-theory -- 新爱因斯坦还没出现, 现在上场的都是罗伦兹. --

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