Reflection Positivity of N=1 Wess-Zumino model on the lattice with exact U(1)_R symmetry

TL;DR

This paper investigates the reflection positivity of the N=1 Wess-Zumino model on the lattice with exact U(1)_R symmetry, revealing issues in bosonic reflection positivity and proposing a simplified model that preserves key symmetries.

Contribution

It demonstrates that a simplified nearest-neighbor bosonic action can maintain U(1)_R symmetry and reflection positivity despite breaking manifest supersymmetry in the free limit.

Findings

Reflection positivity is violated in the bosonic part of the original formulation.

Spectral density positivity holds only for spatial momenta below a certain threshold.

A simplified model with a nearest-neighbor bosonic action preserves U(1)_R symmetry and reflection positivity.

Abstract

By using overlap Majorana fermions, the ${\cal N}=1$ chiral multiple can be formulated so that the supersymmetry is manifest and the vacuum energy is cancelled in the free limit, thanks to the bilinear nature of the free action. It is pointed out, however, that in this formulation the reflection positivity is violated in the bosonic part of the action, although it is satisfied in the fermionic part. It is found that the positivity of the spectral density of the bosonic two-point correlation function is ensured only for the spacial momenta $a | p_k | \lesssim 1.72$ $(k=1,2,3)$. It is then argued that in formulating ${\cal N}=1$ Wess-Zumino model with the overlap Majorana fermion, one may adopt a simpler nearest-neighbor bosonic action, discarding the free limit manifest supersymmetry. The model still preserves the would-be U(1)$_R$ symmetry and satisfies the reflection positivity.