  In this paper, we study the gravity algebra structure on the negative cyclic
homology or the cyclic cohomology of several classes of algebras. These
algebras include: Calabi-Yau algebras, symmetric Frobenius algebras, unimodular
Poisson algebras, and unimodular Frobenius Poisson algebras. The relationships
among these gravity algebras are also discussed under some additional
conditions.
