Dynamical Manifestation of the Goldstone Phenomenon at 1-loop

Details Dynamical Manifestation of the Goldstone Phenomenon at 1-loop Dynamical Manifestation of the Goldstone Phenomenon at 1-loop

1999-09-22

arxiv.org/abs/hep-ph/9909474v1

Phys.Lett. B469 (1999) 188-192

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, Latex

Scientific paper

10.1016/S0370-2693(99)01305-2

We have calculated the damping rate $\Gamma (|{\bf k}|)$ for classical on-shell Goldstone modes of the O(2) symmetric scalar fields propagating in a thermal medium of the broken symmetry phase taking into account the effect of the explicit symmetry breaking. The result of the one-loop analysis can be expanded around $\Gamma (0)$, which depends non-analytically on the parameter of the explicit symmetry breaking, h. $\Gamma (0)$ vanishes when $h\to 0$, demonstrating in this way the absence of the restoring force, when the equilibrium direction of the symmetry breaking is modulated homogeneously.

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