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We give an elementary explicit construction of cell decomposition of the moduli space of projective structures on a two dimensional surface analogous to the decomposition of Penner/Strebel for moduli space of complex structures. The…

High Energy Physics - Theory · Physics 2008-02-03 V. V. Fock

The moduli space of algebraic foliations on P2 of a fixed degree and with a center singularity has many irreducible components. We find a basis of the Brieskorn module defined for a rational function and prove that set of pull-back…

Dynamical Systems · Mathematics 2020-10-05 Yadollah Zare , Susumu Tanabe

We prove that for genus greater than or equal to 5, the moduli space of super Riemann surfaces is not projected (and in particular is not split): it cannot be holomorphically projected to its underlying reduced manifold. Physically, this…

High Energy Physics - Theory · Physics 2023-07-21 Ron Donagi , Edward Witten

We construct toroidal compactifications of the moduli spaces of Drinfeld $\mathbb{F}_q[T]$-modules of rank $d$ with level $N$ structure as moduli spaces of log Drinfeld modules of rank $d$ with level $N$ structure. The toroidal…

Algebraic Geometry · Mathematics 2024-10-01 Takako Fukaya , Kazuya Kato , Romyar Sharifi

In this article, we consider certain irreducible subvarieties of the moduli space of compact Riemann surfaces determined by the specification of actions of finite groups. We address the general problem of determining which among them are…

Algebraic Geometry · Mathematics 2024-07-31 Rubén A. Hidalgo , Jennifer Paulhus , Sebastián Reyes-Carocca , Anita M. Rojas

This is an expository article which describes one approach to the construction and classification of harmonic tori "of finite type", namely, via their ring of polynomial Killing fields. To keep the discussion focussed, the first section is…

Differential Geometry · Mathematics 2014-09-16 I McIntosh

We construct moduli stacks of wild Riemann surfaces in the (pure) untwisted case, for any complex reductive structure group, and we define the corresponding (pure) wild mapping class groups.

Algebraic Geometry · Mathematics 2025-11-18 Jean Douçot , Gabriele Rembado , Matteo Tamiozzo

We conclude the classification of isoparametric (or equivalently, polar) foliations of complex and quaternionic projective spaces. This is done by investigating the projections of certain inhomogeneous isoparametric foliations of the…

Differential Geometry · Mathematics 2024-09-11 Miguel Dominguez-Vazquez , Andreas Kollross

This paper emphasizes the ubiquitous role of moduli spaces of algebraic curves in associative algebra and algebraic topology. The main results are: (1) the space of an operad with multiplication is a homotopy Gerstenhaber (i.e., homotopy…

High Energy Physics - Theory · Physics 2024-09-25 Murray Gerstenhaber , Alexander A. Voronov

The main result of this paper is the explicit computation of the equations defining the moduli space of triples $(C,p,z)$ (where $C$ is an integral and complete algebraic curve, $p$ a smooth rational point and $z$ a formal trivialization…

alg-geom · Mathematics 2016-08-15 J. M. Muñoz Porras , F. J. Plaza Martín

In this paper, we construct the moduli spaces of filtered $G$-local systems on curves for an arbitrary reductive group $G$ over an algebraically closed field of characteristic zero. This provides an algebraic construction for the Betti…

Algebraic Geometry · Mathematics 2025-07-08 Pengfei Huang , Hao Sun

In this short note, completing a sequence of studies by Cooperstein, Kasikova and Shult, we consider the k-Grassmannians of a number of polar geometries of finite rank n. We classify those subspaces that are isomorphic to the j-Grassmannian…

Group Theory · Mathematics 2010-10-04 Rieuwert J. Blok , Bruce N. Cooperstein

We contribute to the foundations of tropical geometry with a view towards formulating tropical moduli problems, and with the moduli space of curves as our main example. We propose a moduli functor for the moduli space of curves and show…

Algebraic Geometry · Mathematics 2020-04-29 Renzo Cavalieri , Melody Chan , Martin Ulirsch , Jonathan Wise

The goal of the paper is to set the foundations and prove some topological results about moduli spaces of non-smooth metric measure structures with non-negative Ricci curvature in a synthetic sense (via optimal transport) on a compact…

Metric Geometry · Mathematics 2023-10-10 Andrea Mondino , Dimitri Navarro

This note is devoted to the definition of moduli spaces of rational tropical curves with n marked points. We show that this space has a structure of a smooth tropical variety of dimension n-3. We define the Deligne-Mumford compactification…

Algebraic Geometry · Mathematics 2007-05-23 Grigory Mikhalkin

We give an example of a one dimensional foliation $\cal F$ of degree two in a Zariski open set of a four dimensional weighted projective space which has only an enumerable set of algebraic leaves. These are defined over rational numbers and…

Algebraic Geometry · Mathematics 2021-09-17 Hossein Movasati

We describe a family of hyperplane arrangements depending on a positive integer parameter $r$, which we refer to as the $r$-braid arrangements, and which can be viewed as a generalization of the classical braid arrangement. The wonderful…

Algebraic Geometry · Mathematics 2025-06-24 Vance Blankers , Emily Clader , Iva Halacheva , Haggai Liu , Dustin Ross

In this paper, we study the moduli space of rational curves in a general low degree hypersurface in the Orthogonal Grassmanian $OG(k,n+1)$ of $k$-dimensional isotropic subspaces of an $n+1$-dimensional vector space equipped with a…

Algebraic Geometry · Mathematics 2025-12-10 Srijan Ghosh

We study de Rham character sheaves on a commutative connected algebraic group $G$, defined as multiplicative line bundles with integrable connection. We construct a group algebraic space $G^\flat$ representing their moduli problem on…

Algebraic Geometry · Mathematics 2026-02-04 Gabriel Ribeiro

The moduli space of principally polarized abelian varieties with real structure and with level $N=4m$ structure (with $m \ge 1$) is shown to coincide with the set of real points of a quasi-projective algebraic variety defined over $\mathbb…

Algebraic Geometry · Mathematics 2007-05-23 Mark Goresky , Yung sheng Tai