A Quantum-Mechanical Mechanism for Reducing the Cosmological Constant

Abstract

We exhibit a mechanism which dynamically adjusts cosmological constant toward $0^{+}$. The adjustment is quantum-mechanical, discharging cosmological constant in random discrete steps. It renders de Sitter space unstable, and triggers its decay toward Minkowski. Since the instability dynamically stops at $\Lambda =0$, the evolution favors the terminal Minkowski space without a need for anthropics. The mechanism works for any QFT coupled to gravity.

Comments: 10 pages LaTeX, 2 figures; v2: additional comments, preprint number added