Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-20
Phys.Rev. D71 (2005) 023517
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, references and comments added, the version accepted for publication in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.71.023517
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.
Okada Nobuchika
Seto Osamu
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