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Constant gauge-coupling matrix from the quadratic N=2 prepotential

Physical scope

A finite-dimensional calculation of the gauge-coupling Hessian in the adopted quadratic ultraviolet N=2 model; it does not establish an exact low-energy effective action.

Example

For the adopted microscopic prepotential FUV(Φ)=i2g2κC(Φ,Φ) with g>0 and κ(Ta,Tb)=δab, the Hessian Fab=∂a∂bFUV is the constant matrix iδab/g2. Its imaginary part is positive definite and independent of the scalar field Φ. This is a property of the adopted quadratic ultraviolet model; it does not assert a non-polynomial low-energy prepotential.

Facts & Assumptions

Given: The quadratic ultraviolet prepotential and positive dimensionless coupling in the N=2 model.

[A1]

Four-dimensional N=2 SU(2) vector and hypermultiplet model: g>0, κ(Ta,Tb)=δab, and FUV(Φ)=i2g2κC(Φ,Φ).

Verification

Given: [A1] and coordinates Φ=∑a=13ΦaTa on su(2)C.

1.1givenA1algebra

Bilinearity and the normalized basis give FUV=i2g2∑a=13(Φa)2. Differentiating this polynomial first in Φa and then in Φb yields Fab=iδab/g2, with no dependence on Φ.

2.1givenA1step 1.1algebra∎

Since g>0, for every nonzero z∈C3 the Hermitian quadratic form of the imaginary part is ∑a∣za∣2/g2>0. Thus the coupling matrix is positive definite, including at Φ=0.

Depends on

Dependency tree · 2 levels