Fast optimization algorithms and the cosmological constant

TitleFast optimization algorithms and the cosmological constant
Publication TypeJournal Article
Year of Publication2017
AuthorsBao, N, Bousso, R, Jordan, SP, Lackey, B
JournalPhysical Review D
Date Published2017/11/13

Denef and Douglas have observed that in certain landscape models the problem of finding small values of the cosmological constant is a large instance of an NP-hard problem. The number of elementary operations (quantum gates) needed to solve this problem by brute force search exceeds the estimated computational capacity of the observable universe. Here we describe a way out of this puzzling circumstance: despite being NP-hard, the problem of finding a small cosmological constant can be attacked by more sophisticated algorithms whose performance vastly exceeds brute force search. In fact, in some parameter regimes the average-case complexity is polynomial. We demonstrate this by explicitly finding a cosmological constant of order 10−120 in a randomly generated 109 -dimensional ADK landscape.