"Creating the Baryon Asymmetry from Lepto-Bubbles," by Jessica Turner (IPPP, Durham)

Monday, June 5, 2017 - 3:00pm to 4:00pm
TEPAPP Seminars

Theory of Elementary Particles, Astroparticle Physics, and Phenomenology (TEPAPP) Seminar

Physics & Astronomy Building (PAB) Room 4-330
Monday, June 5, 2017

Guest Speaker: Jessica Turner (IPPP, Durham) ​

Talk Title: "Creating the Baryon Asymmetry from Lepto-Bubbles"


The origin of the asymmetry between matter and anti-matter of the Universe remains one of the most important open questions in particle physics and cosmology. We propose a novel mechanism, the lepto-bubbles mechanism, to dynamically generate this observed asymmetry. The particle that undergoes the phase transition is a SM-singlet scalar which couples to the lepton number violating Weinberg dimension-5 operator. The phase transition provides an out of equilibrium condition and the time dependent complex couplings of the scalar to the Weinberg operator are CP-violating. Therefore, the CPPT mechanism satisfies Sakharov's conditions without the introduction of the right-handed neutrinos or the see-saw mechanism. We calculate the lepton asymmetry produced by the phase transition using the closed time path formalism.

4-330 PAB