Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-06-14
JHEP 0409 (2004) 060
Physics
High Energy Physics
High Energy Physics - Theory
52 pages, 7 figures, 1 table. Added discussion on supercritical string vacua, added references
Scientific paper
10.1088/1126-6708/2004/09/060
We study some gravitational instanton solutions that offer a natural realization of the spontaneous creation of inflationary universes in the brane world context in string theory. Decoherence due to couplings of higher (perturbative) modes of the metric as well as matter fields modifies the Hartle-Hawking wavefunction for de Sitter space. Generalizing this new wavefunction to be used in string theory, we propose a principle in string theory that hopefully will lead us to the particular vacuum we live in, thus avoiding the anthropic principle. As an illustration of this idea, we give a phenomenological analysis of the probability of quantum tunneling to various stringy vacua. We find that the preferred tunneling is to an inflationary universe (like our early universe), not to a universe with a very small cosmological constant (i.e., like today's universe) and not to a 10-dimensional uncompactified de Sitter universe. Such preferred solutions are interesting as they offer a cosmological mechanism for the stabilization of extra dimensions during the inflationary epoch.
Firouzjahi Hassan
Henry Tye S.-H.
Sarangi Saswat
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