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String theorists have become increasingly convinced of the
existence of a landscape of string theory vacua. The number of vacua
is probably infinite. It is natural to ask if there is any selection
principle that picks up a particular set of vacua as more likely
for the universe to begin its life in. The wavefuntion of the universe
is one possible selection principle. There exist two possible
choices for the wavefunction depending on the boundary condition
imposed at the origin of the universe - the Hartle Hawking
(HH) wavefunction, and the Linde-Vilenkin wavefunction (LV). Both
of them aim at describing the creation of a deSitter universe
from "nothing". However, a naive use of either wavefunction leads to
absurd results. We propose a possible modification of the wavefunction
that leads to a "modified wavefunction" for the universe and which is
devoid of the problems with the HH and the LV wavefunctions. The
application of this modified wavefunction to KKLT and KKLMMT type vacua
suggests that the universe prefers to begin its life in an inflationary
phase with an inflationary scale that is favored by the WMAP data.
16 09 2005, ISCAP Seminar Room Pupin 908, 2:00 pm
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