27 research outputs found
Accelerating universe emergent from the landscape
We propose that the existence of the string landscape suggests the universe
can be in a quantum glass state, where an extremely large viscosity is
generated, and long distance dynamics slows down. At the same time, the short
distance dynamics is not altered due to the separation of time scales. This
scenario can help to understand some controversies in cosmology, for example
the natural existence of slow roll inflation and dark energy in the landscape,
the apparent smallness of the cosmological constant. We see also that moduli
stabilization is no longer necessary. We further identify the glass transition
point, where the viscosity diverges, as the location of the cosmic horizon. We
try to reconstruct the geometry of the accelerating universe from the structure
of the landscape, and find that the metric should have an infinite jump when
crossing the horizon. We predict that the static coordinate metric for dS space
breaks down outside the horizon.Comment: 20 pages, no figures, harvma
Can we predict for the Non-SUSY sector of the Landscape ?
We propose a new selection criteria for predicting the most probable
wavefunction of the universe that propagates on the string landscape
background, by studying its dynamics from a quantum cosmology view. Previously
we applied this proposal to the sector of the landscape. In this work
the dynamic selection criterion is applied to the investigation of the
non- sector.In the absence of detailed information about its structure,
it is assumed that this sector has a stochastic distribution of vacua
energies.The calculation of a distribution probability for the cosmological
constants , obtained from the density of states ,
indicates that the most probable wavefunction is peaked around universes with
zero . In contrast to the {\it extended wavefunction} solutions
found for the sector with -vacua and peaked around
, wavefunctions residing on the non-
sector exhibit {\it Anderson localization}.Although minisuperspace is a limited
approach it presently provides a dynamical quantum selection rule for the most
probable vacua solution from the landscape.Comment: 6 pages, 1 figur