Publication Date

1998

Journal or Book Title

PHYSICAL REVIEW LETTERS

Abstract

One of the puzzles of the Standard Model is why the mass parameter which determines the scale of the Weak interactions is closer to the scale of Quantum Chromodymanics (QCD) than to the Grand Unification or Planck scales. We discuss a novel approach to this problem which is possible in theories in which different regions of the universe can have different values of the the physical parameters. In such a situation, we would naturally find ourselves in a region which has parameters favorable for life. We explore the whole range of possible values of the mass parameter in the Higgs potential, μ2, from +M2 P to −M2 P and find that there is only a narrow window, overlapping the observed value, in which life is likely to be possible. The observed value of μ2 is fairly typical of the values in this range. Thus multiple domain theories in which μ2 varies among domains may give a promising approach to solving the fine tuning problem and explaining the closeness of the QCD scale and the Weak scale.

Comments

This is a pre-published version which is collected from arXiv. The published version is at http://prl.aps.org/pdf/PRL/v80/i9/p1822_1.

Volume

80

Pages

1822-1825

Issue

9

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