The slice decomposition conjecture for the quaternionic norm of real bordism

Let Q8Q_8 be the quaternion group, let C2C_2 be its indicated subgroup, and let NC2Q8MURN_{C_2}^{Q_8} MU\mathbb{R} denote the quaternionic norm of real bordism. For a subgroup LL of Q8Q_8, write ρL\rho_L for the real regular representation of LL, HNC2LZH N_{C_2}^{L}\underline{\mathbb{Z}} for the corresponding Eilenberg–Mac Lane spectrum, and PnnP_n^n for the nn-slice of a Q8Q_8-equivariant spectrum. Slice decomposition conjecture. The slices of NC2Q8MURN_{C_2}^{Q_8} MU\mathbb{R} are of the form

PnnNC2Q8MURQ8+LΣiρLHNC2LZ,P_n^n N_{C_2}^{Q_8} MU\mathbb{R} \simeq \bigvee {Q_8}_+\wedge_L \Sigma^{i\rho_L} H N_{C_2}^{L}\underline{\mathbb{Z}},

for subgroups LL of Q8Q_8. The conjecture is motivated by the Hill–Hopkins–Ravenel description of the slices of NC2C2nMURN_{C_2}^{C_{2^n}} MU\mathbb{R}, but the corresponding formula for the quaternionic norm is not established in the supplied text.

Sources & referencesView supporting material

Primary source

Bertrand J. Guillou, Jesse Keyes and David Mehrle, “The Zero Slice of Quaternionic Real Bordism”, arXiv:2605.01174 (2026).

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