A Soft-Limit Theorem for the On-Shell Scattering Amplitudes Describing Processes Involving Massive Nambu-Goldstone Bosons
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In this thesis we consider systems where both Lorentz invariance and a continuous symmetrygroup G is explicitly broken by coupling a chemical potential µ to one of the generators Qof G. In such systems it is well known that there exist two different types of massive Goldstonebosons, denoted here as mNGBs and pNGBs. In this thesis we managed to prove that a scattering amplitude describing processes involving mNGBs vanish in the soft limit of the mNGB.