Isomorphism classes and geometric classification of three-dimensional Jordan algebras and the length function

@misc{hernandez2026isomorphism,
  title = {{Isomorphism classes and geometric classification of three-dimensional Jordan algebras and the length function}},
  author = {Isabel Hernandez and Maria Eugenia Martin and Rodrigo Lucas Rodrigues and Carlos Andre Gomes Silva},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.00315},
  eprint = {2611.00315},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.00315},
}

TY  - UNPB
TI  - Isomorphism classes and geometric classification of three-dimensional Jordan algebras and the length function
AU  - Isabel Hernandez
AU  - Maria Eugenia Martin
AU  - Rodrigo Lucas Rodrigues
AU  - Carlos Andre Gomes Silva
PY  - 2026
DA  - 2026/11/01
PB  - arXiv
DO  - 10.48550/arxiv.2611.00315
UR  - https://arxiv.org/abs/2611.00315
AB  - We investigate the algebraic classification of Jordan algebras of dimensions at most three over arbitrary fields with more than two elements. Our approach combines the theory of nilalgebras and radicals with Peirce, Wedderburn decompositions and the length function. In characteristic two, we adapt the Peirce decomposition to organize the classification, including the field-dependent isomorphism conditions among parametrized families. We also study the varieties of Jordan algebra structures up to dimension three over an algebraically closed field of characteristic two. Besides explicit degenerations and standard arguments, we introduce the alicyclic and characteristic conditions as geometric obstructions to degeneration. We determine the rigid algebras and irreducible components in both dimensions. In dimension three, one component is the nine-dimensional affine space of square-zero products; unlike the other three components, it contains no open orbit.
ER  -