Brane World Cosmological Solution to the Gravitino Problem

Show simple item record Okada, Nobuchika 2019-05-21T19:16:59Z 2019-05-21T19:16:59Z 2005-01-19
dc.description.abstract We investigate the thermal production of gravitinos in the context of the brane world cosmology. Since the expansion law is modified from the one in the standard cosmology, the Boltzmann equation for the gravitino production is altered. We find that the late-time gravitino abundance is proportional to the “transition temperature”, at which the modified expansion law in the brane world cosmology is connecting with the standard one, rather than the reheating temperature after inflation as in the standard cosmology. This means that, even though the reheating temperature is very high, we can avoid the overproduction of gravitinos by taking the transition temperature low enough. Therefore, the gravitino problem can be solved. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) en_US
dc.subject Gravity in more than four dimensions, Kaluza-Klein theory, unified field theories; alternative theories of gravity en_US
dc.subject Supergravity en_US
dc.subject String and brane phenomenology en_US
dc.title Brane World Cosmological Solution to the Gravitino Problem en_US
dc.type text en_US

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