Homotopy classes appendix in Weinberg's QFT book, Part I

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SUMMARY

The forum discussion centers on understanding specific formulas in Part I of Steven Weinberg's Quantum Field Theory (QFT) trilogy, particularly Formula 2.B.7 and 2.B.10. Pierre expresses his comprehension of Formula 2.B.7 but seeks clarification on Formula 2.B.10, found on page 97 of the paperback edition. Philipp also requests insight into Formula 2.B.7, indicating a shared struggle with these mathematical concepts. The discussion highlights the challenges faced by self-learners in grasping complex QFT formulas.

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  • Review the derivation of Formula 2.B.7 in Weinberg's QFT Part I
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Students and self-learners of Quantum Field Theory, physicists seeking to deepen their understanding of Weinberg's work, and anyone grappling with complex mathematical formulations in theoretical physics.

jouvelot@cri.ensmp.fr
Hi,

I'm trying to teach myself QFT, and I'm stuck with one formula in Part
I of Weinberg's trilogy.

I think I managed to understand how one gets Formula 2.B.7 in the
appendix of Chapter 2, thanks to the information provided by Weinberg,
but don't get 2.B.10, page 97. Could anyone one give me a hint on how
to get it? FWIW, I'm using the paperback edition.

Since this is not key issue, but mostly a technical mathematical point,
I wouldn't want to get bogged down too long by this, but this is
getting irritating :-)

TIA,

Pierre
 
Physics news on Phys.org
hi,

i am also trying to do the same as you do. but I got stucked on the formula (2.B.7). It seems that you have the answer, could you please provide me with that one. I am not sure what is really done to achieve this result in (2.B.7).

greets

- philipp
 

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