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STRING & M THEORY

March 8, 2013
After many desperate attempts to prove that the cosmological constant must vanish, now we face an even more complicated problem. We must understand why the cosmological constant, or the slowly changing dark energy, is at least 120 orders smaller than the Planck density  KALLOSH, LINDE (2002)

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Each bubble nucleation proceeding from a very large vacuum energy represents a symbolic “ball” rolling down the landscape from some dizzy height at random, and ending up in one of the valleys, or vacuum states. So the ensemble of physical by-laws available from string theory becomes actualized as an ensemble of pocket universes, each with its own distinctive low-energy physics. The total number of such universes may be infinite, and the total variety of  possible low-energy physics finite, but stupendously big.

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