#### Vol. 14, No. 10, 2020

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Moduli spaces of symmetric cubic fourfolds and locally symmetric varieties

### Chenglong Yu and Zhiwei Zheng

Vol. 14 (2020), No. 10, 2647–2683
##### Abstract

We realize the moduli spaces of cubic fourfolds with specified group actions as arithmetic quotients of complex hyperbolic balls or type $IV$ symmetric domains, and study their compactifications. We prove the geometric ($GIT$) compactifications are naturally isomorphic to the Hodge theoretic (Looijenga, in many cases Baily–Borel) compactifications. The key ingredients of the proof are the global Torelli theorem by Voisin, the characterization of the image of the period map given by Looijenga and Laza independently, and the functoriality of Looijenga compactifications proved in the Appendix.

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