Journal
PHYSICAL REVIEW D
Volume 95, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.95.085011
Keywords
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Funding
- U.S. Department of Energy [DE-SC0013607]
- Stolt-Nielsen Fund for Education of the American-Scandinavian Foundation
- Norway-America Association
- U.S. Department of Energy (DOE) [DE-SC0013607] Funding Source: U.S. Department of Energy (DOE)
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Tunneling in quantum field theory is worth understanding properly, not least because it controls the long-term fate of our Universe. There are, however, a number of features of tunneling rate calculations which lack a desirable transparency, such as the necessity of analytic continuation, the appropriateness of using an effective instead of classical potential, and the sensitivity to short-distance physics. This paper attempts to review in pedagogical detail the physical origin of tunneling and its connection to the path integral. Both the traditional potential-deformation method and a recent, more direct, propagator-based method are discussed. Some new insights from using approximate semiclassical solutions are presented. In addition, we explore the sensitivity of the lifetime of our Universe to short-distance physics, such as quantum gravity, emphasizing a number of important subtleties.
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