Article ID Journal Published Year Pages File Type
9861526 Physics Letters B 2005 6 Pages PDF
Abstract
We argue that in the context of string theory a large number N of connected degenerate supersymmetric vacua will lead to a ground state for the universe with a small, non-zero cosmological constant. For concreteness, we imagine a history where quantum fluctuations in any one vacuum give an energy density ∼H2mpl2 but the universe quickly cascades to a state of energy density ∼H2mpl2/N at the beginning of inflation. A similar process can occur at the electroweak and other phase transitions. The wavefunction of the universe becomes a superposition of many string vacua.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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