English

On the vanishing of the hyperdeterminant under certain symmetry conditions

Algebraic Geometry 2024-07-10 v1

Abstract

Given a vector space VV over a field \K\K whose characteristic is coprime with d!d!, let us decompose the vector space of multilinear forms V(d)V=λWλ(X,\K)V^*\otimes\overset{\text(d)}{\ldots}\otimes V^*=\bigoplus _\lambda W_\lambda(X,\K) according to the different partitions λ\lambda of dd, i.e. the different representations of SdS_d. In this paper we first give a decomposition W(d1,1)(V,\K)=i=1d1W(d1,1)i(V,\K)W_{(d-1,1)}(V,\K)=\bigoplus_{i=1}^{d-1}W_{(d-1,1)}^i(V,\K). We finally prove the vanishing of the hyperdeterminant of any F(λ(d),(d1,1))W(d1,1)i(V,\K)F\in(\bigoplus_{\lambda\ne(d),(d-1,1)})\oplus W_{(d-1,1)}^i(V,\K). This improves the result in [10] and [1], where the same result was proved without this new last summand.

Keywords

Cite

@article{arxiv.2407.06603,
  title  = {On the vanishing of the hyperdeterminant under certain symmetry conditions},
  author = {Enrique Arrondo and Alicia Tocino},
  journal= {arXiv preprint arXiv:2407.06603},
  year   = {2024}
}