Baryogenesis and entropy generation in a superstring model |
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| Affiliation: | 1. Department of Civil and Infrastructure Engineering at the American University of Ras Al Khaimah (AURAK), Ras Al Khaimah, United Arab Emirates;2. Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology, Jalandhar, 144011, India;3. Department of Civil Engineering, American University of Sharjah, Sharjah, United Arab Emirates;1. Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA;2. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, USA;3. Hospital for Special Surgery, New York, NY, USA |
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| Abstract: | We work out details of a previously proposed senario for baryogenesis in a superstring model, based on the Affleck-Dine mechanism exploiting the decays of large expectation values for squark and slepton fields after inflation. We show how the coefficients of the relevant quartic scalar operators can aquire the necessary imaginary parts. We examine possible sources of entropy among the gauge-singlet scalar and fermion fields including the gravitino, as well as the low-energy SU(2)L × U(1)2 → SU(2)L × U(1)Y → U(1)em phase transitions. We argue that none of these dilute substantailly the baryon-to-entropy ratio, which can easily be in the range preferred by cosmology. This means, in particular, that the Polonyi and gravitino problems are solved. |
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