Title: Chameleon-Photon Mixing in a Primordial Magnetic Field Show Chinese title

Title: 原初磁场中的变色龙光子混合

Abstract: We consider the non-resonant mixing between photons and scalar ALPs with masses much less than the plasma frequency along the path, with specific reference to the chameleon scalar field model. The mixing would alter the intensity and polarization state of the cosmic microwave background (CMB) radiation. We find that the average modification to the CMB polarization modes is negligible. However the average modification to the CMB intensity spectrum is more significant and we compare this to high precision measurements of the CMB monopole made by the far infrared absolute spectrophotometer (FIRAS) on board the COBE satellite. The resulting 95\% confidence limit on the scalar-photon conversion probability in the primordial field (at 100 GHz) is P < 2.6x10^{-2}. This corresponds to a degenerate constraint on the photon-scalar coupling strength, g, and the magnitude of the primordial magnetic field. Taking the upper bound on the strength of the primordial magnetic field derived from the CMB power spectra, B < 5.0x10^{-9}G, this would imply an upper bound on the photon-scalar coupling strength in the range g < 7.14x10^{-13}GeV^{-1} to g < 9.20x10^{-14}GeV^{-1}, depending on the power spectrum of the primordial magnetic field. Show Chinese abstract

Abstract: 我们研究了光子与标量ALP（其质量远小于路径上的等离子体频率）之间的非共振混合，特别参考了变色龙标量场模型。 这种混合会改变宇宙微波背景（CMB）辐射的强度和偏振状态。 我们发现CMB偏振模式的平均修改可以忽略不计。 然而，CMB强度谱的平均修改更为显著，我们将其与COBE卫星上搭载的远红外绝对光谱辐射计（FIRAS）所测量的CMB单极子进行了比较。 在原初场（100 GHz）中，标量-光子转换概率的95%置信限为P < 2.6×10^{-2}。 这对应于光子-标量耦合强度g和原初磁场强度的退化约束。 根据从CMB功率谱推导出的原初磁场强度上限B < 5.0×10^{-9}G，这表明光子-标量耦合强度的上限范围为g < 7.14×10^{-13}GeV^{-1}到g < 9.20×10^{-14}GeV^{-1}，具体取决于原初磁场功率谱。