What are soft theorems ? I tried reading Weinberg’s paper but couldn’t understand it, are there any resources on this ? I am very interested in the case of scalars.
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$\begingroup$ If you know enough quantum field theory, then Strominger's lectures are great: arxiv.org/abs/1703.05448 (here also a link to the youtube video of the class: youtube.com/playlist?list=PLwLjkVy3evOazQ3FoRH-Sz8Eoxx2oriXL ) $\endgroup$ – M.Jo Jan 17 '19 at 10:53
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$\begingroup$ Which Weinberg paper? $\endgroup$ – Qmechanic♦ Jan 20 '19 at 17:25