Descent spectral sequence surjectivity conjecture for truncated Brown–Peterson spectra

Suppose that d53fnd53f\langle n\rangle is equipped with an E3\mathbb E_3-MU\mathrm{MU}-algebra structure. Let

E2(THH(MU))E_2(\operatorname{THH}(\mathrm{MU}))

and

E2(THH(d53fn))E_2(\operatorname{THH}(d53f\langle n\rangle))

be the E2E_2-pages of the descent spectral sequences for

THH(MU)THH(MU/MU)\operatorname{THH}(\mathrm{MU})\to\operatorname{THH}(\mathrm{MU}/\mathrm{MU})

and

THH(d53fn)THH(d53fn/MU).\operatorname{THH}(d53f\langle n\rangle)\to\operatorname{THH}(d53f\langle n\rangle/\mathrm{MU}).

Descent spectral sequence surjectivity conjecture. The map

E2s,t(MU)E2s,t(d53fn)E_2^{s,t}(\mathrm{MU})\to E_2^{s,t}(d53f\langle n\rangle)

is surjective for 0sn0\leq s\leq n. This would imply degeneration of the descent spectral sequence for THH(d53fn)\operatorname{THH}(d53f\langle n\rangle), given degeneration for THH(MU)\operatorname{THH}(\mathrm{MU}) and the concentration of the target in 0sn+10\leq s\leq n+1.

Sources & referencesView supporting material

Primary source

David Jongwon Lee, “Integral topological Hochschild homology of connective complex K-theory”, arXiv:2206.02411 (2026).

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