Statistics – Applications
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvd..44.3620a&link_type=abstract
Physical Review D (Particles and Fields), Volume 44, Issue 11, 1 December 1991, pp.3620-3627
Statistics
Applications
20
Applications Of Electroweak Models To Specific Processes, Spontaneous Breaking Of Gauge Symmetries, Particle-Theory And Field-Theory Models Of The Early Universe
Scientific paper
The electroweak vacuum need not be absolutely stable. For certain top-quark and Higgs-boson masses in the minimal standard model, it is instead metastable with a lifetime exceeding the present age of the Universe. The decay of our vacuum may be nucleated at low temperature by quantum tunneling or at high temperature by thermal excitation. We show that the requirement that the vacuum survive the high temperatures of the early Universe places the strongest constraints from vacuum stability on the top-quark and Higgs-boson masses in the minimal standard model. If a single Higgs boson is found experimentally, these constraints may place an upper bound on the scale of new physics beyond the minimal standard model. In contrast with other work, we examine temperatures very large compared to the scale of weak symmetry restoration and find much stronger bounds. We also present a simple analytic approximation that directly relates the bounds to the running coupling constants of the minimal standard model.
Arnold Peter
Vokos Stamatis
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