Seminar Fred Jegerlehner

Fred Jegerlehner
About the role of the Higgs boson in the early universe

The Higgs boson discovered recently at the LHC has been
found to have a very special numerical value. Depending on some
technical details in calculating the Standard Model (SM) effective
parameters, the ground state of the SM, characterized by a minimum of
the potential of the Higgs particle, either is just sharply missing a
stable vacuum or actually is found to remain stable up the the Planck
scale. I discuss this latter scenario, which implies a huge effective
Higgs mass and a huge cosmological constant in the early phase of the
universe just after the Big Bang. In fact the SM predicts a huge dark
energy contribution which triggers the inflation of the early
universe. Reheating is provided by the heavy Higgses decaying
predominantly into top--anti-top quark pairs. Later, after the
universe has cooled down, the originally positive Higgs potential mass
term changes sign which triggers the Higgs mechanism and the
electroweak phase transition. After the SM particles have acquired
their masses, the yet abundant heavy flavors particles, like the top
and anti-top quarks, decay into normal matter. In such a scenario the
SM likely can also explain the matter--anti-matter asymmetry. In the
era, when the SM undergoes the electroweak phase transition,
surprisingly the Higgs as well as the cosmological constant match with
the corresponding low energy values, while they are quadratically and
quartically enhanced in the Planck cutoff before the Higgs mechanism
has taken place.

Thursday, April 17, 2014 - 11:00 - 11:45