Free perverse algebra conjecture for perverse Eilenberg–MacLane spaces

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Let P=[n]{\mathtt P}=[n], let p‾\overline{p} be a Goresky–MacPherson perversity, and let mm be the differential degree of a generator xx. Write H∙‾∗\mathscr H^\ast_{\overline{\bullet}} for the perverse cohomology algebra. Free perverse algebra conjecture. The following isomorphisms of perverse algebras should hold:

H∙‾∗(K(Q,m,[n],p‾);Q)≅⋀∙‾x,\mathscr H^\ast_{\overline{\bullet}}(K(\mathbb{Q},m,[n],\overline{p});\mathbb{Q})\cong \bigwedge_{\overline{\bullet}} x,

where ⋀∙‾x\bigwedge_{\overline{\bullet}}x is the free rational commutative graded perverse algebra on one generator of differential degree mm and perverse degree p‾\overline{p}, and

H∙‾∗(K(F2,m,[n],p‾);F2)≅K∙‾∗(x),\mathscr H^\ast_{\overline{\bullet}}(K(\mathbb{F}_{2},m,[n],\overline{p});\mathbb{F}_{2})\cong \mathscr K^\ast_{\overline{\bullet}}(x),

where K∙‾∗(x)\mathscr K^\ast_{\overline{\bullet}}(x) is the free unstable perverse algebra on one generator of differential degree mm and perverse degree p‾\overline{p}. These formulas would identify the perverse cohomology algebras with the free algebras generated by the fundamental class, extending the classical rational and mod-22 calculations; the statement is presented conditionally in the source and remains open here.

References

Primary source

David Chataur and Daniel Tanré, “Natural operations in Intersection Cohomology”, arXiv:2005.04960 (2025).

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