From: Amara Graps (amara@amara.com)
Date: Fri Aug 23 2002 - 05:26:10 MDT
High Energy Physics - Theory, abstract
http://xxx.uni-augsburg.de/abs/hep-th/0208156
hep-th/0208156
From: Andrei Linde <linde@hbar.stanford.edu>
Date: Wed, 21 Aug 2002 19:56:28 GMT (201kb)
Supergravity, Dark Energy and the Fate of the Universe
Authors: Renata Kallosh, Andrei Linde, Sergey Prokushkin, Marina Shmakova
Comments: 18 pages, 12 figures, ReVTeX
Report-no: SLAC-PUB-9408
Subj-class: High Energy Physics - Theory; Popular Physics; Space Physics
We propose a description of dark energy and acceleration of the
universe in extended supergravities with de Sitter (dS) solutions.
Some of them are related to M-theory with non-compact internal
spaces. Masses of ultra-light scalars in these models are quantized
in units of the Hubble constant: m^2 = n H^2. If dS solution
corresponds to a minimum of the effective potential, the universe
eventually becomes dS space. If dS solution corresponds to a maximum
or a saddle point, which is the case in all known models based on
N=8 supergravity, the flat universe eventually stops accelerating
and collapses to a singularity. We show that in these models, as
well as in the simplest models of dark energy based on N=1
supergravity, the typical time remaining before the global collapse
is comparable to the present age of the universe, t = O(10^{10})
years. We discuss the possibility of distinguishing between various
models and finding our destiny using cosmological observations.
Paper: Source (201kb), PostScript, or Other formats
-- ******************************************************************** Amara Graps, PhD email: amara@amara.com Computational Physics vita: ftp://ftp.amara.com/pub/resume.txt Multiplex Answers URL: http://www.amara.com/ ******************************************************************** "Math is Hard." --Ken
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