Imprint of galactic rotation curves and metric fluctuations on the recombination era anisotropy

Philip D. Mannheim

doi:10.1016/j.physletb.2023.137851

paper

Imprint of galactic rotation curves and metric fluctuations on the recombination era anisotropy

arXiv:2212.13942 · doi:10.1016/j.physletb.2023.137851

Abstract

In applications of the conformal gravity theory it has been shown that a scale of order 105 Mpc due to large scale inhomogeneities such as clusters of galaxies is imprinted on the rotation curves of galaxies. Here we show that this same scale is imprinted on recombination era anisotropies in the cosmic microwave background. We revisit an analysis due to Mannheim and Horne, to show that in the conformal gravity theory the length scale of metric signals that originate in the primordial nucleosynthesis era at $1 0^{9 \circ}$ K can fill out the entire recombination era sky. Similarly, the length scale of acoustic signals that originate at $1 0^{13 \circ}$ K can also fill out the entire recombination era sky. We show that the amplitudes of metric fluctuations that originate in the nucleosynthesis era can grow by a factor of $1 0^{12}$ at recombination, and by a factor of $1 0^{18}$ at the current time. In addition we find that without any period of exponential expansion a length scale as small as $1 0^{- 33}$ cm can grow to the size of the recombination sky if it begins to grow at a temperature of order $1 0^{33}$ degrees.

arXiv comment16 pages

Imprint of galactic rotation curves and metric fluctuations on the recombination era anisotropy

Abstract

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