Mass equidistribution for lifts on hyperbolic $4$-manifolds

Abstract

This paper is part of a broader project to establish the quantum unique ergodicity conjecture for Hecke-Maass forms on arithmetic hyperbolic $4$-manifolds. The conjecture is known in dimensions $2$ and $3$, but dimensions $4$ and higher present a new difficulty: ruling out concentration along certain homogeneous submanifolds whose stabilizers are non-tempered. We overcome it here for the Pitale lifts, a family of non-holomorphic analogues of Saito-Kurokawa lifts. Our main new ingredient is a construction of an amplifier with exceptional geometric properties. To the best of our knowledge, this is the first successful use of amplification to rule out concentration along a non-tempered subgroup.

arXiv comment31 pages