Logarithmic topological Hochschild homology of the truncated Brown--Peterson spectrum

Abstract

We study logarithmic topological Hochschild homology (log THH) of the truncated Brown--Peterson spectra $\mathrm{BP}\langle n\rangle$. We first construct compatible prelog structures on $\mathrm{BP}\langle n\rangle$ generated by the classes $v_i$. Then we compute the $V(n)$-homotopy groups of log THH of $\mathrm{BP}\langle n\rangle$ for the prelog structures generated by $v_n$ and $(v_1,\cdots,v_n)$, under the assumption that the Smith--Toda complex $V(n)$ exists as a ring spectrum. At height $2$ and for $p\geq7$, we also compute the $V(2)$-homotopy groups of log THH of $\mathrm{BP}\langle 2\rangle/v_1$ relative to $v_2$.