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arXiv 1207.2135hep-phastro-ph.COhep-th
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人为选择的重子数与等曲率约束

Anthropically Selected Baryon Number and Isocurvature Constraints

John McDonald

摘要:

观察到的重子和暗物质密度的相似性表明,它们在物理上是相关的,无论是通过粒子物理机制还是人择。人择选择的先决条件是产生不同Omega_{B} / Omega_{DM}的超视界大小的结构域。在这里,我们考虑通过随机变化的相位或幅度的复杂的字段Φ在通货膨胀期间的域的不同重子密度的生成。重子等曲率扰动是任何这样的机制的自然结果。我们推导了膨胀过程中膨胀率H_{I}和质量参数μ的重子等曲率边界,μ破坏了Φ势的整体U(1)对称性。我们表明,当μ < H_{I}(如预期的超对称模型)的重子等曲率约束,可以满足只有当H_{I}是非常小的,H_{I} < 10^{7} GeV,或者如果非重整化普朗克抑制的修正φ势被排除到一个高的顺序。或者,如果mu足够大,mu > 10^{16} GeV,则可能存在未抑制的Phi电势。我们表明,重子等曲率约束可以自然地满足阿弗莱克-丁重子生成,作为沿MSSM平坦方向的非重整化项的高阶抑制的结果。

英文摘要:

The similarity of the observed baryon and dark matter densities suggests that they are physically related, either via a particle physics mechanism or anthropic selection. A pre-requisite for anthropic selection is the generation of superhorizon-sized domains of different Omega_{B}/Omega_{DM}. Here we consider generation of domains of different baryon density via random variations of the phase or magnitude of a complex field Phi during inflation. Baryon isocurvature perturbations are a natural consequence of any such mechanism. We derive baryon isocurvature bounds on the expansion rate during inflation H_{I} and on the mass parameter mu which breaks the global U(1) symmetry of the Phi potential. We show that when mu < H_{I} (as expected in SUSY models) the baryon isocurvature constraints can be satisfied only if H_{I} is unusually small, H_{I} < 10^{7} GeV, or if non-renormalizable Planck-suppressed corrections to the Phi potential are excluded to a high order. Alternatively, an unsuppressed Phi potential is possible if mu is sufficiently large, mu > 10^{16} GeV. We show that the baryon isocurvature constraints can be naturally satisfied in Affleck-Dine baryogenesis, as a result of the high-order suppression of non-renormalizable terms along MSSM flat directions.

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