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Unified origin of baryons and dark matter |
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| Authors: | Ryuichiro Kitano Hitoshi Murayama Michael Ratz |
| Institution: | 1. Theoretical Division T-8, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;2. Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8568, Japan;3. Department of Physics, University of California, Berkeley, CA 94720, USA;4. Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;5. Physik Department T30, Technische Universität München, James-Franck-Straße, 85748 Garching, Germany |
| Abstract: | We investigate the possibility that both the baryon asymmetry of the universe and the observed cold dark matter density are generated by decays of a heavy scalar field which dominates the universe before nucleosynthesis. Since baryons and cold dark matter have common origin, this mechanism yields a natural explanation of the similarity of the corresponding energy densities. The cosmological moduli and gravitino problems are avoided. |
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