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Gauge-invariant bilinears in one SU(2) hypermultiplet

Physical scope

A local algebraic check of the mass and cubic superpotential terms in the classical N=2 SU(2) model for one fundamental hypermultiplet; it is not a quantum or empirical claim.

Example

Use the defining representation R=C2 with group homomorphism ρfund:SU(2)→U(2) given by ρfund(u)=u acting by matrix multiplication. In each superspace fiber let Q be a column in R, let Q~ be a row in R∗, and let Φ act by ρfund∗(Φ). Under any chiral supergauge transformation UR=eiΛR, set Q′=URQ, Q~′=Q~UR−1, and Φ′=URΦUR−1. Then the mass bilinear Q~Q and cubic bilinear Q~ΦQ in the adopted N=2 superpotential are gauge invariant. This checks gauge invariance of these two terms only; it does not prove the extended supersymmetry variation.

Facts & Assumptions

Given: The fundamental representation and chiral supergauge transformations in the Example, under the adopted N=2 classical model.

[A1]

Four-dimensional N=2 SU(2) vector and hypermultiplet model: one hypermultiplet has chiral superfields Q in R and Q~ in R∗, with superpotential 2 Q~ΦQ+mQ~Q.

[F1]

Four-dimensional N=1 non-Abelian vector superfield in connection normalization: in a representation R, a chiral matter superfield transforms as ΦR↦eiΛRΦR under an admissible chiral supergauge parameter.

Verification

Given: [A1], [F1], and the fundamental representation U=eiΛR with its dual action on R∗.

1.1givenA1F1algebra

The dual action is right multiplication by U−1, so Q~′Q′=Q~U−1UQ=Q~Q. Thus the mass bilinear is invariant.

2.1givenA1F1step 1.1algebra∎

The adjoint action gives Q~′Φ′Q′=Q~U−1(UΦU−1)UQ=Q~ΦQ. Hence the cubic bilinear, and therefore the stated linear combination of mass and cubic terms, is invariant.

Depends on

Dependency tree · 2 levels