An odd version of the Grothendieck--Teichmüller Lie algebra and the odd Deligne--Drinfeld conjecture

@misc{naef2026version,
  title = {{An odd version of the Grothendieck--Teichmüller Lie algebra and the odd Deligne--Drinfeld conjecture}},
  author = {Florian Naef and Thomas Willwacher},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.41766},
  eprint = {2610.41766},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.41766},
}

TY  - UNPB
TI  - An odd version of the Grothendieck--Teichmüller Lie algebra and the odd Deligne--Drinfeld conjecture
AU  - Florian Naef
AU  - Thomas Willwacher
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2610.41766
UR  - https://arxiv.org/abs/2610.41766
AB  - We study an ``odd'' version of the Grothendieck--Teichmüller Lie algebra that is obtained by replacing free Lie algebras in even generators by free graded Lie algebras in odd generators in the classical definition. These odd variants are related to the ``odd'' Kontsevich graph complex in the same way as the classical Grothendieck--Teichmüller group is related to the even Kontsevich graph complex. We show an odd analog of the Deligne--Drinfeld conjecture, namely that the odd Grothendieck--Teichmüller Lie algebra is isomorphic to a free graded Lie algebra in one odd generator of weight 3. Thus we in particular compute the odd graph cohomology in the bottom cohomological degree, showing that it is mostly zero.
ER  -