Brans-Dicke宇宙中的轻子数生成

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讨论了Brans-Dicke理论中的辅助性标量φ在宇宙的重子数不对称起源中所扮演的可能角色.在Morganstern关于Brans-Dicke(BD)宇宙学的一系列工作的基础上,讨论了这个引力性标量场的导数和重子流JμB或者"重子-轻子"流JμB-L的耦合效应.发现由这个耦合形成的自发重子数生成机制,只要其中大统一发生的时标足够提前,就可以产生足够的重子数不对称nB/s~10-10.此外,也研究了由Davoudiasl引进的里奇标量R的导数和重子流之间的相互作用耦合在辐射为主的BD宇宙中的重子数生成效应.结果表明,在此情况下因为R不再为零也同样可以获得重子数的不对称,从而不同于爱因斯坦宇宙框架下的相关结论.
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