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Št. zadetkov: 5
False vacuum decay rate of scalar field at one loop
Nikiša Plešec, Miha Nemevšek, Lorenzo Ubaldi
Magistrsko delo
Oznake: false vacuum decay;decay rate;scalar field theory;thin-wall limit;quantum fluctuations;renormalization;functional determinant;
This thesis explores the false vacuum decay rate of a scalar field at one-loop order in two, three, and four dimensions using semiclassical methods. The results are compared with established analytical solutions in the thin-wall limit, where the true and false vacua are nearly degenerate. A central ...
Leto: 2024 Vir: Fakulteta za matematiko in fiziko (UL FMF)
False vacuum decay rate from thin to thick walls
Marco Matteini, Miha Nemevšek, Yutaro Shoji, Lorenzo Ubaldi
Izvirni znanstveni članek
Oznake: razpad lažnega vakuuma;metastable states;false vacuum;decay rates;thermal field theory;early Universe;
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 ...
Leto: 2025 Vir: Institut Jožef Stefan (IJS)
Revising the full one-loop gauge prefactor in electroweak vacuum stability
Pietro Baratella, Miha Nemevšek, Yutaro Shoji, Katarina Trailović, Lorenzo Ubaldi
Izvirni znanstveni članek
Oznake: fizika;vakum;
We revisit the decay rate of the electroweak vacuum in the standard model with the full one-loop prefactor. We focus on the gauge degrees of freedom and derive the degeneracy factors appearing in the functional determinant using group theoretical arguments. Our treatment shows that the transverse mo ...
Leto: 2025 Vir: Institut Jožef Stefan (IJS)
Functional determinants for false vacuum decay
Pietro Baratella, Miha Nemevšek, Katarina Trailović, Yutaro Shoji, Lorenzo Ubaldi
Izvirni znanstveni članek
Oznake: razpad lažnega vakuuma;false vacuum;decay rates;Higgs properties;multi-Higgs models;functional determinants;
We derive simple expressions to regularise functional determinants from fluctuations of fields with spin 0, 1/2, and 1. These are important for the precise dimensionful determination of false vacuum decay rates. We work in D = 4 Euclidean dimensions and use familiar Feynman diagrammatic techniques w ...
Leto: 2025 Vir: Institut Jožef Stefan (IJS)
Super heavy dark matter from inflationary Schwinger production
Mar Bastero-Gil, Paulo B. Ferraz, Lorenzo Ubaldi, Roberto Vega-Morales
Izvirni znanstveni članek
Oznake: teoretična fizika;temna snov;temni fotoni;
We consider a simple setup with a dark sector containing dark electrons charged under an Abelian 𝑈⁢(1)𝐷 gauge symmetry. We show that, if the massless dark photon associated to the 𝑈⁢(1)𝐷 is produced during inflation in such a way as to form a classical dark electric field, then dark electron-pos ...
Leto: 2024 Vir: Institut Jožef Stefan (IJS)
Št. zadetkov: 5
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