Electroweak Vacuum Stabilized by Moduli during/after Inflation

Understand

It is known that the present electroweak vacuum is likely to be metastable and it may lead to a serious instability during/after inflation.

• We propose a simple solution to the problem of vacuum instability during/after inflation.
• If there is a moduli field which has Planck-suppressed interactions with the standard model fields, the Higgs quartic coupling in the early universe naturally takes a different value from the present one.
• A slight change of the quartic coupling in the early universe makes the Higgs potential absolutely stable and hence we are free from the vacuum instability during/after inflation.