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arXiv 1111.3026astro-ph.COhep-ph
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宇称和电荷宇称违反变α理论对CMB的影响分析

Analysing the Effect on CMB in a Parity and Charge Parity Violating Varying Alpha Theory

Debaprasad Maity, Pisin Chen

摘要:

本文详细研究了我们最近提出的宇称和电荷宇称(PCP)破坏变化α模型对宇宙微波背景(CMB)光子通过星系团内介质(ICM)的影响。众所周知,ICM由磁化等离子体组成。根据我们的模型,由于非平凡的标量光子相互作用,CMB的偏振和强度会受到影响,当穿越ICM。我们已经计算了这种偏振和强度的演变集体,被称为斯托克斯参数的CMB光子在其旅程通过ICM和测试我们的结果对后发星系团的Sunyaev-Zel'dovich(SZ)测量。我们的模型包含一个PCP违反参数,$β$,和α变化的尺度$ω$。利用推导出的对Coma团的光子-标量转换几率${\bar P}_{γ\rightarrow ϕ}$的约束条件,在参考文献[1]中,[34]我们在($ω,β$)参数平面中发现了等值线图。在这个参数空间中的$β=0$线对应于充分研究的麦克斯韦-狄龙型模型,其具有$ω\gtrapprox 6.4 \times 10^{9}$ GeV的下限。通常,随着$β$的绝对值增加,$ω$的下限也增加。我们的模型一般预测修改的CMB极化与非平凡的依赖于奇偶违反耦合参数$β$。然而,在这项特殊的研究中,它是不受约束的。我们表明,这种效果原则上可以检测到在未来的测量CMB偏振,使$β$也可以受到约束。

英文摘要:

In this paper we study in detail the effect of our recently proposed model of parity and charge-parity (PCP) violating varying alpha on the Cosmic Microwave Background (CMB) photon passing through the intra galaxy-cluster medium (ICM). The ICM is well known to be composed of magnetized plasma. According to our model, the polarization and intensity of the CMB would be affected when traversing through the ICM due to non-trivial scalar photon interactions. We have calculated the evolution of such polarization and intensity collectively, known as the stokes parameters of the CMB photon during its journey through the ICM and tested our results against the Sunyaev-Zel'dovich (SZ) measurement on Coma galaxy cluster. Our model contains a PCP violating parameter, $β$, and a scale of alpha variation $ω$. Using the derived constrained on the photon-to-scalar conversion probability, ${\bar P}_{γ\rightarrow ϕ}$, for Coma cluster in ref.[34] we found a contour plot in the ($ω,β$) parameter plane. The $β=0$ line in this parameter space corresponds to well-studied Maxwell-dilaton type models which has lower bound on $ω\gtrapprox 6.4 \times 10^{9}$ GeV. In general, as the absolute value of $β$ increases, lower bound on $ω$ also increases. Our model in general predicts the modification of the CMB polarization with a non-trivial dependence on the parity violating coupling parameter $β$. However, it is unconstrained in this particular study. We show that this effect can in principle be detected in the future measurements on CMB polarization such that $β$ can also be constrained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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