Speaker
Description
The flavor symmetry-breaking scale of the Froggatt-Nielsen (FN) mechanism is very weakly constrained by current experiments and can lie anywhere from a few TeV to the Planck scale. We develop ultraviolet (UV) complete models that generate the FN mechanism, with a global $U (1)_{\rm{FN}}$ flavor symmetry for two commonly used charge assignments. We explore the possibility of a strong first-order phase transition (SFOPT) induced by the flavon, using the one-loop finite temperature effective potential. We show that for flavor symmetry-breaking scales of ∼ $10^4 − 10^7$ GeV, the associated stochastic gravitational wave (GW) background may be strong enough to be detected at upcoming GW observatories such as the Big Bang Observer (BBO) and the Einstein Telescope (ET). We identify viable regions of the parameter space for the best detection prospects. Both flavor models can produce a detectable GW background, however, the GW signature does not discriminate between them.
| Session | Beyond the Standard Model |
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