期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/05/005
关键词
cosmology with extra dimensions; string theory and cosmology; initial conditions and eternal universe; Cosmic strings; domain walls; monopoles
资金
- National Science Foundation [06533561, 0353314]
Topology-changing transitions between vacua of different effective dimensionality are studied in the context of a 6-dimensional Einstein-Maxwell theory. The landscape of this theory includes a 6d de Sitter vacuum (dS(6)), a number of dS(4) x S-2 and AdS(4) x S-2 vacua, and a number of AdS(2) x S-4 vacua. We find that compactification transitions dS(6) -> AdS(2) x S-4 occur through the nucleation of electrically charged black hole pairs, and transitions from dS(6) to dS(4) x S-2 and AdS(4) x S-2 occur through the nucleation of magnetically charged spherical black branes. We identify the appropriate instantons and describe the spacetime structure resulting from brane nucleation.
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