Neveu–Schwarz unitarity conjecture for minimal W-algebra highest weight modules

Let Wmin⁡k(g)W^k_{\min}(\mathfrak g) be the minimal WW-algebra, let Pk+P^+_k denote the relevant set of dominant integral weights, and let A(k,ν)A(k,\nu) be the lower bound for the conformal weight. Write

{LW(ν,ℓ)∣ν∈Pk+, ν non-extremal, ℓ≥A(k,ν)}\left\{L^W(\nu,\ell)\mid \nu\in P^+_k,\ \nu\text{ non-extremal},\ \ell\ge A(k,\nu)\right\}

for the already known unitary highest weight modules, where extremality means that ν(θi∨)>Mi(k)+χi\nu(\theta_i^\vee)>M_i(k)+\chi_i for some ii. Neveu–Schwarz unitarity conjecture. The set of unitary highest weight modules over Wmin⁡k(g)W^k_{\min}(\mathfrak g) is the union of

{LW(ν,ℓ)∣ν∈Pk+, ν non-extremal, ℓ≥A(k,ν)}\left\{L^W(\nu,\ell)\mid \nu\in P^+_k,\ \nu\text{ non-extremal},\ \ell\ge A(k,\nu)\right\}

and

{LW(ν,A(k,ν))∣ν∈Pk+, ν extremal}.\left\{L^W(\nu,A(k,\nu))\mid \nu\in P^+_k,\ \nu\text{ extremal}\right\}.

The non-extremal part is a theorem, while the conjecture asserts unitarity and completeness for the extremal boundary modules.

References

Primary source

Victor G. Kac, Pierluigi Möseneder Frajria and Paolo Papi, “Spectral flow and application to unitarity of representations of minimal W-algebras”, arXiv:2508.06873 (2026).

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