- Letter
- Open Access
Alternative to collective coordinates
Phys. Rev. D 103, L041701 – Published 12 February, 2021
DOI: https://doi.org/10.1103/PhysRevD.103.L041701
Abstract
Collective coordinates provide a powerful tool for separating collective and elementary excitations, allowing both to be treated in the full quantum theory. The price is a canonical transformation which leads to a complicated starting point for subsequent calculations. Sometimes the collective behavior of a soliton is simple but nontrivial, and one is interested in the elementary excitations. We show that in this case an alternative prescription suffices, in which the canonical transformation is not necessary. The use of a nonperturbative operator which creates a soliton state allows the theory to be constructed perturbatively in terms of the soliton normal modes. We show how translation invariance may be perturbatively imposed. We apply this to construct the two-loop ground state of an arbitrary scalar kink.
Physics Subject Headings (PhySH)
See Also
Two-loop scalar kinks
kink mass at two loops
Article Text
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