Eigenvalue estimates without Bakry-Emery-Ricci bounds

Abstract

We establish a lower bound for the real eigenvalues of a Laplace-Beltrami operator with an $L^{\infty }$-drift term. We make no assumptions that the operator is self-adjoint or that the drift has any additional regularity. In the case where the operator is self-adjoint, this establishes a lower bound on the spectrum without assuming a lower bound for the Bakry-Emery Ricci tensor. Put colloquially, this result states that no matter which way the wind blows, heat will diffuse at a definite rate depending only on the geometry of the underlying space and the maximal wind speed.

24 pages, 1 figure. This paper was previously titled "On the spectrum of $L^{\infty }$-drifted Laplace-Beltrami operators." arXiv admin note: substantial text overlap with arXiv:1811.01037