Apr 24 – 28, 2017
Palais des Papes, Avignon
Europe/Paris timezone

Gravitational waves from the QCD chiral phase transition before the electroweak symmetry breaking

Apr 24, 2017, 5:30 PM
Chambre du Trésorier (Palais des Papes, Avignon)

Chambre du Trésorier

Palais des Papes, Avignon


Dr Kengo Shimada (LAPTh)


If the electroweak sector of the standard model is described by classically conformal dynamics, we show that the electroweak phase transition can be triggered by the chiral condensation of six massless quarks in the standard model in the supercooled universe.
The phase transition is first-order and occurs below the QCD scale temperature.
One of the phenomenological consequences of this scenario is sizable gravitational waves from the bubble collisions.
We derive the necessary conditions for the scenario to occur, using the specific example of the classically conformal B-L model.
We also briefly mention other cosmological implications, such as possibilities for electroweak baryogenesis and altered dark matter productions.

Primary authors

Dr Kengo Shimada (LAPTh) Pasquale Serpico (LAPTH, Annecy-le-vieux) Prof. Satoshi Iso (High Energy Accelerator Research Organization (KEK))

Presentation materials