MCTP HET BROWN BAG SEMINAR
BBN and the Unnatural Weak Scale


Oct
30
2013

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  • Speaker: David Pinner (University of California - Berkeley, Berkeley Center for Theoretical Physics)
  • Host Department: Physics
  • Date: 10/30/2013
  • Time: 12:00 PM - 1:00 PM

  • Location: 3481 Randall

  • Description:

    The discovery of a perturbatively-coupled, 125 GeV Higgs, together with the absence of LHC signals for supersymmetry, places the principle of naturalness under tension. In this talk I will discuss the possibility that the weak scale is unnatural, with its value determined environmentally in the landscape. In particular, this environmental selection may be driven by BBN: as the weak scale is increased, the abundance of Hydrogen in the early universe is rapidly depleted. That our own universe contains an O(1) fraction of primordial Helium arises as a conspiracy among the weak scale, the neutron-proton mass difference, and the planck scale.