20.500.12556/DiRROS-24527 False vacuum decay rate from thin to thick walls We consider a single real scalar field in flat spacetime with a polynomial potential up to ϕ4, that has a local minimum, the false vacuum, and a deeper global minimum, the true vacuum. When the vacua are almost degenerate we are in the thin wall regime, while as their difference in potential energy increases, we approach the thick wall regime. We give explicit simple formulae for the decay rate of the false vacuum in 3 and 4 spacetime dimensions. Our results include a careful treatment both of the bounce action, which enters at the exponent of the decay rate, and of the functional determinant at one loop, which determines the prefactor. The bounce action is computed analytically as an expansion in the thin wall parameter in generic D dimensions. We find that truncating such an expansion at second order we obtain a remarkably accurate bounce action also deep into thick wall regimes. We calculate the functional determinant numerically in 3 and 4 dimensions and fit the results with simple polynomials of the same thin wall parameter. This allows us to write the complete one-loop decay rate as a compact expression, which works accurately from thin to thick wall regimes. metastable states false vacuum decay rates thermal field theory early Universe razpad lažnega vakuuma true false true SISSA Italija Angleški jezik Slovenski jezik © The Authors. Neznano 2025-12-04 08:11:32 2025-12-04 08:11:33 2025-12-06 03:38:45 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Soavtorji: Miha Nemevšek, Yutaro Shoji, Lorenzo Ubaldi; Opis vira z dne 17. 4. 2025; str. 1-48 Vol. 2025, article no. 120 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-03-03 2025-03-04 2025-04-16 53 1029-8479 10.1007/JHEP04(2025)120 233074947 https://link.springer.com/article/10.1007/JHEP04(2025)120 1 87a11885-d0e0-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=36571 RAZ_Matteini_Marco_2025.pdf RAZ_Matteini_Marco_2025.pdf 1 8CECDDFDD58110BE159501351A049475 5c3dc496b0c0059c34f0bb35b953cb98c1769fae89ea97954358868e6ad51566 d87efc62-d0e0-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=36572 Institut Jožef Stefan 0 0 0