TL;DR
This paper develops an unfolded system for describing an on-shell free hypermultiplet, revealing how harmonic superspace formulations naturally emerge and demonstrating the universality of unfolded dynamics across various superspace frameworks.
Contribution
It introduces an unfolded system for hypermultiplets that unifies different superspace formulations and highlights the background universality of the unfolded approach.
Findings
Harmonic superspace arises from the unfolded system via vielbeinization.
The unfolded approach unifies formulations in harmonic, N=2, N=1 superspaces, and Minkowski space.
The harmonic contribution is reflected in the universal unfolded fiber.
Abstract
We construct an unfolded system that describes an on-shell free massless hypermultiplet and show that the standard harmonic superspace formulation of this model naturally arises from the "vielbeinization" of unfolded 1-forms associated to R-symmetry. Moreover, using this system as an example, we demonstrate the phenomenon of background universality of the unfolded dynamics approach: we systematically deduce formulations in harmonic, N=2, and N=1 superspaces, as well as the component formulation in Minkowski space, directly from this unfolded system. We also comment on a putative off-shell extension of the on-shell system we constructed, and show how the harmonic contribution is reflected in the universal unfolded fiber.
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