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PreprintCC BY 4.0arXiv

Modified hydrogen recombination rate due to non-Hubble redshift effects

  • I. V Krasnov
  • N. S. Nedelko
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Abstract

The accumulation of observational data in recent years has led to a peculiar situation in which measurements of the cosmological parameters made by various collaborations and using different methods yield significantly different values. A solution to this problem may be found by modifying the models used to obtain these values. In this work, we revisit the standard approach to the recombination calculation and investigate a mechanism that can introduce corrections to the rate at which Lyman-alpha photons escape the resonance line. We find that interactions of Lyman-alpha line photons with moving neutral hydrogen atoms can become a source of such a correction. An analysis of CMB data for the modified model favors the existence of a non-Hubble redshift effect and prefers slightly higher values of H0 and smaller values of Ωm and S8 compared to the standard ΛCDM model, as well as a smaller value of the scalar spectrum index ns.

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Cite

BibTeXRIS
BibTeX
@misc{krasnov2026modified,
  title = {{Modified hydrogen recombination rate due to non-Hubble redshift effects}},
  author = {I. V Krasnov and N. S. Nedelko},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.21992},
  eprint = {2610.21992},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.21992},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Modified hydrogen recombination rate due to non-Hubble redshift effects
AU  - I. V Krasnov
AU  - N. S. Nedelko
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2610.21992
UR  - https://arxiv.org/abs/2610.21992
AB  - The accumulation of observational data in recent years has led to a peculiar situation in which measurements of the cosmological parameters made by various collaborations and using different methods yield significantly different values. A solution to this problem may be found by modifying the models used to obtain these values. In this work, we revisit the standard approach to the recombination calculation and investigate a mechanism that can introduce corrections to the rate at which Lyman-alpha photons escape the resonance line. We find that interactions of Lyman-alpha line photons with moving neutral hydrogen atoms can become a source of such a correction. An analysis of CMB data for the modified model favors the existence of a non-Hubble redshift effect and prefers slightly higher values of H_0 and smaller values of Ω_m and S_8 compared to the standard ΛCDM model, as well as a smaller value of the scalar spectrum index n_s.
ER  -