In Srednicki (ch14 say), he looks at integrals of the form [tex] \int\, \frac{d^{d}l}{l^4}...[/tex]. This is of course diveregent at large l if d>=4, which is easily seen by looking at the integrals measure in hyperspherical coords.(adsbygoogle = window.adsbygoogle || []).push({});

However, what about small l divergences, surely these occur if d<4, e.g. if d=3 we have something that goes as [tex] \frac{1}{l^2} [/tex], which diverges for small l. Why are we not concerned about this and only large l divergences?

Thanks

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# What about small momentum divergences?

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