The Serre--Hochschild plane of a finite-dimensional algebra

RESUMO

For a finite-dimensional algebra $A$ over a field we organize the Hochschild cohomology of $A$ with coefficients in all derived tensor powers of the Serre bimodule $\omega=\D A$ into a single bigraded derived invariant, the \emph{Serre--Hochschild plane} $\T^{p,m}(A)$, defined over all of $\mathbb Z^2$ without inverting $\omega$. The column $m=0$ is the Tamarkin--Tsygan calculus, $m=1$ is dual Hochschild homology (the column governing Han's conjecture), $m=2$ recovers the $\tau$-Hochschild shadow, and $m=-1$ Keller's Calabi--Yau completions. We prove a ladder theorem making every column a symmetric module over the calculus, a coefficient spectral sequence, a Serre reflection fixing the Han column, a dictionary identifying the plane of a geometric algebra with twisted polyvector cohomology of a smooth projective variety, finite generation of the homology column under the condition $\Fg$ with a growth trichotomy for $\dim\HH_n(A)$, and a complete graded Tate criterion for Han's conjecture on periodic algebras. Han's conjecture follows for symmetric periodic algebras in every characteristic and for local periodic algebras in characteristic zero. We exhibit the first example of a stably traceless periodic algebra, showing that the graded criterion is sharp.