International Joint Workshop on the Standard Model and Beyond 2024 & 3rd Gordon Godfrey Workshop on Astroparticle Physics

Session

Early Universe

10 Dec 2024, 14:00

202 (Ainsworth Building)

Conveners

Early Universe

• Seyda Ipek

18. Implications of a new SU(2) flavour group in early-universe phase transitions

Prof. Alan Stanley Cornell (University of Johannesburg (ZA))

10/12/2024, 14:00

Contributed Talk

Mounting evidence suggests that planned and present gravitational-wave detectors may be sensitive to signatures from first-order phase transitions in the early universe. Here, we investigate the influence of heavy vector-like fermions on the phase transition. Specifically, we consider the recently-proposed "flavour transfer" model, where the SM flavour structure is augmented by a new...

28. Revisiting the phase transition of the flaton potential

Tomasz Dutka (Korea Institute for Advanced Study)

10/12/2024, 14:30

Contributed Talk

Recently, there has been a lot of attention given to cosmological first-order phase transitions in various contexts. To achieve a strong first-order phase transition a flat symmetry-breaking potential is commonly required. For instance, a classically scale invariant potential can provide such a flat potential, $V\sim {\varphi }^4\log \varphi$, albeit with a large dilution factor and run-away bubbles....

66. Early Universe phase transitions in a Scale Invariant Standard Model

Joshua Cesca

10/12/2024, 14:50

Contributed Talk

The mass hierarchy problem is concerned with the large differences in scale present in our universe, namely between the Higgs mass ($125$ GeV) and the Planck mass (${10}^{19}$ GeV). The Standard Model currently offers no explanation for this difference which prompts the investigation of other fundamental theories. It has been argued that scale invariance of physical laws may be a solution to...

54. Affleck-Dine Dirac Leptogenesis

Neil Barrie

10/12/2024, 15:10

Contributed Talk

We present a minimal framework that realises successful Dirac Leptogenesis through the Affleck-Dine mechanism. A single right-handed neutrino and a neutrinophillic Higgs doublet are introduced to the Standard Model, which couple via a Yukawa interaction. The inflationary setting is induced by a combination of the two Higgs doublets, with their global symmetry violating interactions leading to...

23. Leptogenesis in the Zee Model

Adam Lackner

10/12/2024, 15:30

Contributed Talk

Is it possible to get leptogenesis to work in the Zee Model? Come to this talk and find out!