We extend Torleif Veen's calculation of higher topological Hochschild homology ${ \sf THH}^{ [n]}_*(\mathbb{ F}_p)$ from $n\leq 2p$ to $n\leq 2p+2$ for $p$ odd, and from $n=2$ to $n\leq 3$ for $p=2$. We calculate higher Hochschild homology ${ \sf HH}_*^{ [n]}(k[x])$ over $k$ for any integral domain $k$, and ${ \sf HH}_*^{ [n]}(\mathbb{ F}_p[x]/x^{ p^\ell})$ for all $n>0$. We use this and \'etale descent to calculate ${ \sf HH}_*^{ [n]}(\mathbb{ F}_p[G])$ for all $n>0$ for any cyclic group $G$, and therefore also for any finitely generated abelian group $G$. We show a splitting result for higher ${ \sf THH}$ of commutative $\mathbb{ F}_p$-group algebras and use this technique to calculate higher topological Hochschild homology of such group algebras for as large an $n$ as ${ \sf THH}^{ [n]}_*(\mathbb{ F}_p) $ is known for.
Categories: math.AT