Super-horizon Perturbations and CMBA
Ding-fang Zeng, Yi-hong Gao
TL;DR
This paper argues that super-horizon perturbations influence the average CMB temperature but do not affect its anisotropy within a given Hubble volume, based on a thought experiment.
Contribution
It introduces a gedanken experiment showing super-horizon modes cannot be detected as real perturbations within a Hubble volume, affecting only the average CMB.
Findings
Super-horizon modes do not produce observable anisotropies in CMBA.
Observers cannot detect super-horizon perturbations as real modes.
Super-horizon perturbations influence only the average CMB temperature.
Abstract
We provided a gedanken experiment and argued that since observers inside a given Hubble volume could not detect the super horizon perturbation modes as real perturbations, these modes could only affect the average value of the cosmic microwave background (CMB), but not its anisotropy properties (CMBA) in that Hubble volume.
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Taxonomy
TopicsCosmology and Gravitation Theories · Radio Astronomy Observations and Technology · Galaxies: Formation, Evolution, Phenomena