Baryo-Leptogenesis induced by modified gravities in the primordial Universe
Baryo-Leptogenesis induced by modified gravities in the primordial Universe
复制标题
原始宇宙中重力改变引起的重子轻体发生
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
L. Pizza
中科院分区：
文献类型：
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作者：
L. Pizza
本文用修正的引力理论分析了宇宙中物质与反物质之间的不对称性这一长期存在的问题。特别地，我们研究了引力的两种f（R）理论模型，通过适当地选择自由参数，在广义相对论（GR）预测的辐射主导（RD）阶段，对宇宙的尺度因子引入了一点扰动，即，$a（t）\sim t^{1/2}$。这个小扰动产生了相差零的Ricci标量，即，$R\neq 0$，它再现了在引力重子生成和引力稀薄生成理论框架内计算的不对称因子$\eta$的正确大小。自由参数的适时选择进行了讨论，以获得与实验数据一致的结果。此外，势的形式$V$，标量张量理论共形等价的$f（R）$理论再现的权利不对称因子，在这里得到。
The long-standing problem of the asymmetry between matter and antimatter in the Universe is, in this paper, analysed in the context of the modified theories of gravity. In particular we study two models of $f(R)$ theories of gravitation that, with the opportune choice of the free parameters, introduce a little perturbation to the scale factor of the Universe in the radiation dominated (RD) phase predicted by general relativity (GR), i.e., $a(t)\sim t^{1/2}$. This little perturbation generates a Ricci scalar different by zero, i.e., $R\neq 0$ that reproduces the correct magnitude for the asymmetry factor $\eta$ computed in the frame of the theories of the gravitational baryogenesis and gravitational leptogenesis. The opportune choice of the free parameters is discussed in order to obtain results coherent with experimental data. Furthermore, the form of the potential $V$, for the scalar-tensor theory conformally equivalent to the $f(R)$ theory which reproduces the right asymmetry factor, is here obtained.
影响因子：
5
作者：
Berry, Christopher P. L.;Gair, Jonathan R.
通讯作者：
Gair, Jonathan R.