Topological Hochschild homology of truncated Brown-Peterson spectra II

Abstract

We compute topological Hochschild homology of ${\mathbb{E}}_3$-MU-algebra forms of the second truncated Brown-Peterson spectrum with Adams summand coefficients at $p=2$ and conditionally at arbitrary primes. We also provide a new computational tool, a variant of the Brun spectral sequence, for computing topological Hochschild homology of truncated Brown-Peterson spectra with certain coefficients. As a consequence, we show that ${\mathbb{E}}_3$-MU-algebra forms of truncated Brown-Peterson spectra are not Thom spectra $\mathrm{BP}⟨n⟩$ at the prime $p=2$ for any $n\ge 2$.