论文标题
重新评估灰尘在形成CMB中的作用
Reassessing Dust's Role in Forming the CMB
论文作者
论文摘要
The notion that dust might have formed the cosmic microwave background (CMB) has been strongly refuted on the strength of four decades of observation and analysis, in favour of recombination at a redshift z ~ 1080. But tension with the data is growing in several other areas, including measurements of the Hubble constant H(z) and the BAO scale, which directly or indirectly impact the physics at the surface of last scattering (LSS). R_H = CT Universe至少解决了其中的一些张力。我们在本文中表明 - 如果BAO量表实际上等于声学范围---在这种宇宙学中，LSS的红移为z_cmb〜16，将其放置在流行III星形成的时代，然后在15> z> 6的重新离子时代之前，在15> z> 6的时代之前，z_cmb and h_cmb and h_0 = h_0 = h_0 = h_0 = h_0 = h_0 = h_0 = h_0 =今天应该是〜3 k，因此H_0和Baryon与光子比不是独立的免费参数。这种情况可能是由于粉尘对CMB光子的重新化而产生的，这可能是由Pop III星的射出物提供给星际介质的。因此，灰尘的再生可能会在R_H = CT宇宙中作为相关成分重新呈现。即将到来的高灵敏度仪器应能够轻松地通过（i）检测Z〜1080处的重组线或（ii）在〜2-4％的频率范围内建立强大的频率依赖性变化来区分重组和尘埃场景。
The notion that dust might have formed the cosmic microwave background (CMB) has been strongly refuted on the strength of four decades of observation and analysis, in favour of recombination at a redshift z ~ 1080. But tension with the data is growing in several other areas, including measurements of the Hubble constant H(z) and the BAO scale, which directly or indirectly impact the physics at the surface of last scattering (LSS). The R_h=ct universe resolves at least some of this tension. We show in this paper that---if the BAO scale is in fact equal to the acoustic horizon---the redshift of the LSS in this cosmology is z_cmb ~ 16, placing it within the era of Pop III star formation, prior to the epoch of reionization at 15 > z > 6. Quite remarkably, the measured values of z_cmb and H_0 = H(0) in this model are sufficient to argue that the CMB temperature today ought to be ~ 3 K, so H_0 and the baryon to photon ratio are not independent free parameters. This scenario might have resulted from rethermalization of the CMB photons by dust, presumably supplied to the interstellar medium by the ejecta of Pop III stars. Dust rethermalization may therefore yet resurface as a relevant ingredient in the R_h=ct universe. Upcoming high sensitivity instruments should be able to readily distinguish between the recombination and dust scenarios by either (i) detecting recombination lines at z ~ 1080, or (ii) establishing a robust frequency-dependent variation of the CMB power spectrum at the level of ~ 2-4% across the sampled frequency range.
