The normal to the superfluid transition of liquid helium breaks is a U(1) global symmetry. Since it is a continuous, global symmetry (unlike superconductivity which is a gauge theory), I expect that there be Goldstone bosons in the theory like phonons or magnons which result from the spontaneous breakdown of translational invariance in crystals and rotational symmetry in ferromagnets, respectively. However, while reading online, and textbooks on statistical mechanics, I sparsely encounter Goldstone bosons in the context of superfluid transition.
Can someone suggest a reference (a condensed matter physics reference, in particular) which mentions about Goldstone modes in superfluids? If my guess is incorrect (i.e., there are no such modes) do correct me. If the presence of such modes is debated and controversial in the condensed matter community, and therefore not a standard textbook material, also let me know.