Aug 4 – 8, 2015
America/Detroit timezone

The lifetime of the electroweak vacuum

Aug 5, 2015, 5:00 PM
30m
Kalamazoo (Michigan League)

Kalamazoo

Michigan League

Electroweak and Higgs Theory EWK and Higgs Sector

Speaker

Marc Sher (William and Mary College)

Description

If the Standard Model (SM) is valid up to extremely high energy scales, then the Higgs potential becomes unstable at approximately 10^11 GeV. Calculations of the lifetime showed that it vastly exceeds the age of the Universe. However, these calculations are extremely sensitive to effects from Planck scale higher-dimensional operators and, without knowledge of these operators, firm conclusions about the lifetime of the SM vacuum cannot be drawn. It is surprising that the Planck scale operators can have such a large effect when the instability is at 10^11 GeV. There are two reasons for the size of this effect. In typical tunneling calculations, the value of the field at the center of the critical bubble is much larger than the point of the instability; in the SM case, this turns out to be numerically within an order of magnitude of the Planck scale. In addition, tunneling is an inherently non-perturbative phenomenon, and may not be as strongly suppressed by inverse powers of the Planck scale. We include effective higher dimensional Planck-scale operators and show that they can have an enormous effect on the tunneling rate.
Oral or Poster Presentation Oral

Primary author

Marc Sher (William and Mary College)

Presentation materials