About: Ward Identity makes QED logarithmic divergent   Sponge Permalink

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Quick question regarding superficial degrees of freedom and Ward identities. For instance in Peskin and Schroeder it is stated that the photon-self energy is superficially quadratically UV divergent but due to the Ward identity it is only logarithmically divergent. I don't see this argument. The self-energy is given by How does the Ward identity, or in other words, gauge invariance kill of the divergences? Best, A friendly helper

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  • Ward Identity makes QED logarithmic divergent
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  • Quick question regarding superficial degrees of freedom and Ward identities. For instance in Peskin and Schroeder it is stated that the photon-self energy is superficially quadratically UV divergent but due to the Ward identity it is only logarithmically divergent. I don't see this argument. The self-energy is given by How does the Ward identity, or in other words, gauge invariance kill of the divergences? Best, A friendly helper
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  • Quick question regarding superficial degrees of freedom and Ward identities. For instance in Peskin and Schroeder it is stated that the photon-self energy is superficially quadratically UV divergent but due to the Ward identity it is only logarithmically divergent. I don't see this argument. The self-energy is given by How does the Ward identity, or in other words, gauge invariance kill of the divergences? Best, A friendly helper
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