Allahverdi, Rouzbeh and Frey, Andrew R. and Mazumdar, Anupam (2007) Graceful exit from a stringy landscape via MSSM inflation. Physical Review, 76 (2). 026001. ISSN 0556-2821Full text not available from this repository.
The cosmological evolution of the string landscape is expected to consist of multiple stages of old inflation with a large cosmological constant, each of which ends by tunneling. Old inflation has a well-known graceful exit problem as the observable universe becomes empty, devoid of any entropy. Simultaneously, in the quest for reheating the right degrees of freedom, it is important that the final stage of inflation reheat the standard model sector. It is known that inflation can occur naturally along a flat direction of the minimal supersymmetric standard model (MSSM), solving the reheating problem, but the initial conditions require a large degree of fine-tuning. In this paper, we study how inflation of a MSSM flat direction can be embedded into the string theory landscape to solve both the graceful exit problem of old inflation and the fine-tuning problem of MSSM inflation, elaborating on ideas of Bousso and Polchinski. The fluctuations of the MSSM flat direction during old inflation create regions with initial conditions favorable for eternal inflation, which also allows the cosmological constant to continue to relax. This final phase of inflation also provides all the usual benefits of MSSM inflation, including straightforward reheating into standard model degrees of freedom.
|Journal or Publication Title:||Physical Review|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited By:||Dr Anupam Mazumdar|
|Deposited On:||27 Jan 2010 16:41|
|Last Modified:||26 Jul 2012 16:59|
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