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A translation surface is obtained by taking plane polygons and gluing their edges by translations. We ask which subgroups of the Veech group of a primitive translation surface can be realised via a translation covering. For many primitive surfaces we prove that partition stabilising congruence subgroups are the Veech group of a covering surface. We also address the coverings via their monodromy groups and present examples of cyclic coverings in short orbits, i.e. with large Veech groups.

cyclic covering --- monodromy group --- Kongruenzgruppe --- zyklische Überlagerung --- Translationsüberlagerung --- translation coveringVeechgruppe --- congruence subgroup --- Monodromiegruppe --- Veech group

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Mumford-Tate groups are the fundamental symmetry groups of Hodge theory, a subject which rests at the center of contemporary complex algebraic geometry. This book is the first comprehensive exploration of Mumford-Tate groups and domains. Containing basic theory and a wealth of new views and results, it will become an essential resource for graduate students and researchers. Although Mumford-Tate groups can be defined for general structures, their theory and use to date has mainly been in the classical case of abelian varieties. While the book does examine this area, it focuses on the nonclassical case. The general theory turns out to be very rich, such as in the unexpected connections of finite dimensional and infinite dimensional representation theory of real, semisimple Lie groups. The authors give the complete classification of Hodge representations, a topic that should become a standard in the finite-dimensional representation theory of noncompact, real, semisimple Lie groups. They also indicate that in the future, a connection seems ready to be made between Lie groups that admit discrete series representations and the study of automorphic cohomology on "ients of Mumford-Tate domains by arithmetic groups. Bringing together complex geometry, representation theory, and arithmetic, this book opens up a fresh perspective on an important subject.

Mumford-Tate groups. --- Geometry, Algebraic. --- Algebraic geometry --- Geometry --- Hodge theory --- Mumford-Tate groups --- Deligne torus integer. --- Galois group. --- Grothendieck conjecture. --- Hodge decomposition. --- Hodge domain. --- Hodge filtration. --- Hodge orientation. --- Hodge representation. --- Hodge structure. --- Hodge tensor. --- Hodge theory. --- Kubota rank. --- Lie algebra representation. --- Lie group. --- Mumford-Tate domain. --- Mumford-Tate group. --- Mumford-Tate subdomain. --- Noether-Lefschetz locus. --- Vogan diagram method. --- Weyl group. --- abelian variety. --- absolute Hodge class. --- algebraic geometry. --- arithmetic group. --- automorphic cohomology. --- classical group. --- compact dual. --- complex manifold. --- complex multiplication Hodge structure. --- complex multiplication. --- endomorphism algebra. --- exceptional group. --- holomorphic mapping. --- homogeneous complex manifold. --- homomorphism. --- mixed Hodge structure. --- moduli space. --- monodromy group. --- natural symmetry group. --- oriented imaginary number fields. --- period domain. --- period map. --- polarization. --- polarized Hodge structure. --- pure Hodge structure. --- reflex field. --- semisimple Lie algebra. --- semisimple Lie group. --- Γ-equivalence classes.