Hilbert series for contractads and modular compactifications
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arXiv
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| Format: | Preprint |
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2024
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| author | Khoroshkin, Anton Lyskov, Denis |
| author_facet | Khoroshkin, Anton Lyskov, Denis |
| contents | Contractads are operadic-type algebraic structures well-suited for describing configuration spaces indexed by a simple connected graph $Γ$. Specifically, these configuration spaces are defined as $\mathrm{Conf}_Γ(X):=X^{|V(Γ)|}\setminus \cup_{(ij)\in E(Γ)} \{x_i=x_j\}$. In this paper, we explore functional equations for the Hilbert series of Koszul dual contractads and provide explicit Hilbert series for fundamental contractads such as the commutative, Lie, associative and the little discs contractads.
Additionally, we focus on a particular contractad derived from the wonderful compactifications of $\mathrm{Conf}_Γ(\mathbb{k})$, for $\mathbb{k}=\mathbb{R},\mathbb{C}$. First, we demonstrate that for complete multipartite graphs, the associated wonderful compactifications coincide with the modular compactifications introduced by Smyth. Second, we establish that the homology of the complex points and the homology of the real locus of the wonderful contractad are both quadratic and Koszul contractads. We offer a detailed description of generators and relations, extending the concepts of the Hypercommutative operad and cacti operads, respectively. Furthermore, using the functional equations for the Hilbert series, we describe the corresponding Hilbert series for the homology of modular compactifications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_05909 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Hilbert series for contractads and modular compactifications Khoroshkin, Anton Lyskov, Denis Quantum Algebra Algebraic Geometry Algebraic Topology Combinatorics 18M60, 14N20 Contractads are operadic-type algebraic structures well-suited for describing configuration spaces indexed by a simple connected graph $Γ$. Specifically, these configuration spaces are defined as $\mathrm{Conf}_Γ(X):=X^{|V(Γ)|}\setminus \cup_{(ij)\in E(Γ)} \{x_i=x_j\}$. In this paper, we explore functional equations for the Hilbert series of Koszul dual contractads and provide explicit Hilbert series for fundamental contractads such as the commutative, Lie, associative and the little discs contractads. Additionally, we focus on a particular contractad derived from the wonderful compactifications of $\mathrm{Conf}_Γ(\mathbb{k})$, for $\mathbb{k}=\mathbb{R},\mathbb{C}$. First, we demonstrate that for complete multipartite graphs, the associated wonderful compactifications coincide with the modular compactifications introduced by Smyth. Second, we establish that the homology of the complex points and the homology of the real locus of the wonderful contractad are both quadratic and Koszul contractads. We offer a detailed description of generators and relations, extending the concepts of the Hypercommutative operad and cacti operads, respectively. Furthermore, using the functional equations for the Hilbert series, we describe the corresponding Hilbert series for the homology of modular compactifications. |
| title | Hilbert series for contractads and modular compactifications |
| topic | Quantum Algebra Algebraic Geometry Algebraic Topology Combinatorics 18M60, 14N20 |
| url | https://arxiv.org/abs/2406.05909 |