Hopkins' algebraic chromatic splitting conjecture

From papers

Let EE_* be the coefficient ring of Morava EE-theory at height nn, let EEE_*E be its cooperations, and let v0=p,v1,,vn1v_0=p,v_1,\ldots,v_{n-1} denote the usual periodicity elements. For i1i\geq 1, consider the inverse systems of EEE_*E-comodules E/(p,,vn2,vn1i)E_*/(p,\ldots,v_{n-2},v_{n-1}^i) and their derived limits. Let ι ⁣:S0LK(n)S0\iota\colon S^0\to L_{K(n)}S^0 be the unit map and let ζ ⁣:S1LK(n)S0\zeta\colon S^{-1}\to L_{K(n)}S^0 be the class constructed from the determinant fiber sequence. Hopkins' algebraic chromatic splitting conjecture. For all heights n2n\geq 2 and sufficiently large primes pp, there are isomorphisms of EEE_*E-comodules

limEEsE/(p,,vn2,vn1i){E/(p,,vn2)s=0,vn11E/(p,,vn2)s=1,0otherwise.\varprojlim_{E_*E}^{s}E_*/(p,\ldots,v_{n-2},v_{n-1}^{i})\cong\begin{cases} E_*/(p,\ldots,v_{n-2}) & s=0,\\ v_{n-1}^{-1}E_*/(p,\ldots,v_{n-2}) & s=1,\\ 0 & \mathrm{otherwise.}\end{cases}

Moreover, these isomorphisms should be topologically realized by ι\iota and ζ\zeta, respectively. This algebraic form predicts the two nonzero derived-limit contributions corresponding to the unit and the degree 1-1 class in the K(n)K(n)-local sphere. It is motivated by height-two computations and is recorded in the cited literature; the source presents it as a conjecture and does not state that it has been resolved in the stated generality.

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Sources & referencesView supporting material

Primary source

Tobias Barthel and Piotr Pstrągowski, “Morava K-theory and Filtrations by Powers”, arXiv:2111.06379 (2021).

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