Tunneling problems by quantum Monte Carlo

Дата и время публикации : 1999-01-11T14:00:57Z

Авторы публикации и институты :
Nikolai Prokof’ev (Russian Research Center “Kurchatov Institute”)
Boris Svistunov (Russian Research Center “Kurchatov Institute”)
Igor Tupitsyn (Russian Research Center “Kurchatov Institute”)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 4 pages, LaTex, 3 Postscript figures
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We develop a new numerical scheme which allows precise solution of coherent tunneling problems, i.e., problems with exponentially small transition amplitudes between quasidegenerate states. We explain how this method works for the single-particle (tunneling in the double-well potential) and many-body systems (e.g., vacuum-to-vacuum transitions), and gives directly the instanton shape and tunneling amplitude. Most importantly, transition amplitudes may be calculated to arbitrary accuracy (being limited solely by statistical errors) no matter how small are their absolute values.

Category: Physics