$\mathrm{C}_{3}$ in dimension 4
This tangent representation satisfies the necessary conditions for a hyperelliptic fourfold, but it is not known whether it is realized by an actual variety. See completeness in dimension 4.
- holonomy group
- $\mathrm{C}_{3}$, order $3$, SmallGroup $[3,1]$ · character table
- tangent representation $\rho$
- $\rho(g_{1}) = \operatorname{diag}(1, 1, \zeta_{3}, \zeta_{3}^{2})$
- order of $\omega_X$
- 1
- number of moduli
- 6
- irregularity $q = \dim \operatorname{Aut}^0(X)$
- 2
- Albanese
- the Albanese variety has dimension $2$; the general fiber has dimension $2$ and is an abelian variety or a hyperelliptic variety (details)
- $\mathbf{D}^{\mathrm{b}}(X)$
- indecomposable
- Hochschild cohomology $\dim \mathrm{HH}^\bullet$
- $(1, 4, 10, 20, 26, 20, 10, 4, 1)$
Hodge diamond
1
2 2
2 6 2
2 8 8 2
1 6 12 6 1
2 8 8 2
2 6 2
2 2
1
2 2
2 6 2
2 8 8 2
1 6 12 6 1
2 8 8 2
2 6 2
2 2
1
polyvector fields $\mathrm{H}^q(X,\bigwedge^p T_X)$
1
22
262
2882
161261
2882
262
22
1
22
262
2882
161261
2882
262
22
1
References
- A. Demleitner, The classification of hyperelliptic groups in dimension 4. arXiv:2211.07998
- A. Demleitner, C. Gleissner, The classification of rigid hyperelliptic fourfolds, Ann. Mat. Pura Appl. (4) 202 (2023) 1425–1450. MR4576947 doi
- P. Belmans, A. Demleitner, P. Núñez, The Albanese morphism for hyperelliptic varieties, Indag. Math. (N.S.) 37 (2026) 1450–1475. MR5103244 doi