The proposed structure of the irreducible standard representation for p/3 < c < p/2

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Let H1,c(S3,h)H_{1,c}(S_3,\mathfrak{h}) be the rational Cherednik algebra over an algebraically closed field of characteristic p>3p>3, with c∈Fpc\in\mathbb{F}_p. Let M1,c(Stand)M_{1,c}(\mathrm{Stand}) be the Verma module for the standard representation, and let L1,c(Stand)L_{1,c}(\mathrm{Stand}) be its irreducible quotient. For p/3<c<p/2p/3<c<p/2, the proposed quotient is obtained by factoring out the submodule generated by one-dimensional vectors of types Sign\mathrm{Sign}, Triv\mathrm{Triv}, Sign\mathrm{Sign}, and Triv\mathrm{Triv} in degrees −p+3c-p+3c, 3p−3c3p-3c, p+3cp+3c, and 5p−3c5p-3c, respectively.

Proposed structure. The quotient and its character and Hilbert polynomial are

L1,c(Stand)=M1,c(Stand)/⟨the four specified generating spaces⟩,L_{1,c}(\mathrm{Stand})=M_{1,c}(\mathrm{Stand})/\langle\text{the four specified generating spaces}\rangle, χL1,c(Stand)(z)=χSh∗(z)([Stand]−z−p+3c[Sign]−z3p−3c[Triv]−zp+3c[Sign]−z5p−3c[Triv]+z4p[Stand]),\chi_{L_{1,c}(\mathrm{Stand})}(z)=\chi_{S\mathfrak{h}^*}(z)\left([\mathrm{Stand}]-z^{-p+3c}[\mathrm{Sign}]-z^{3p-3c}[\mathrm{Triv}]-z^{p+3c}[\mathrm{Sign}]-z^{5p-3c}[\mathrm{Triv}]+z^{4p}[\mathrm{Stand}]\right), hL1,c(Stand)(z)=2−z−p+3c−z3p−3c−zp+3c−z5p−3c+2z4p(1−z)2.h_{L_{1,c}(\mathrm{Stand})}(z)=\frac{2-z^{-p+3c}-z^{3p-3c}-z^{p+3c}-z^{5p-3c}+2z^{4p}}{(1-z)^2}.

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References

Primary source

Martina Balagovic and Jordan Barnes, “Representations of the rational Cherednik algebra H_t,c(S_3,) in positive characteristic”, arXiv:2307.06603 (2023).

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