Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-03-20
AIPConf.Proc.903:634-637,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
To appear in Proceedings of Susy06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Inte
Scientific paper
10.1063/1.2735264
The anthropic principle is based on the observation that, within narrow bounds, the laws of physics are such as to have allowed the evolution of life. The string theoretic approach to understanding this observation is based on the expectation that the effective potential has an enormous number of local minima with different particle masses and perhaps totally different fundamental couplings and space time topology. The vast majority of these alternative universes are totally inhospitable to life, having, for example, vacuum energies near the natural (Planck) scale. The statistics, however, are assumed to be such that a few of these local minima (and not more) have a low enough vacuum energy and suitable other properties to support life. In the inflationary era, the "multiverse" made successive transitions between the available minima until arriving at our current state of low vacuum energy. String theory, however, also suggests that the absolute minimum of the effective potential is exactly supersymmetric. Questions then arise as to why the inflationary era did not end by a transition to one of these, when will the universe make the phase transition to the exactly supersymmetric ground state, and what will be the properties of this final state.
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