A ug 2 00 0 Brane World Phenomenology and the Z 2 Symmetry
نویسندگان
چکیده
The Friedmann equation for a positive tension brane world with and without the Z2 symmetry is derived and the possible effects of dropping the Z2 symmetry on the expansion of our Universe are discussed. The global solutions for the metric in the infinite extra dimension case are found; cosmological constraints are discussed. This is applied to various phenomenological aspects of brane worlds, including phase transitions, topological defects and GUT baryogenesis. Important differences to the usual case are elucidated. DAMTP-2000-79 SWAT/264 [email protected] [email protected] [email protected] [email protected]
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