Stagflation -- Bose-Einstein condensation in the early universe

Understand

Our universe experienced the accelerated expansion at least twice; an extreme inflationary acceleration in the early universe and the recent mild acceleration.

• By introducing the Bose-Einstein condensation (BEC) phase of a boson field, we have been developing a unified model of dark energy (DE) and dark matter (DM) for the later mild acceleration.
• In this scenario, two phases of BEC (=DE) and normal gas (=DM) transform with each other through BEC phase transition.
• This unified model has successfully explained the mild acceleration as an attractor.