Alleviating the Hubble Tension via Cosmological Time Dilation in the meVSL Model
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912581369724928 |
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| author | Lee, Seokcheon |
| author_facet | Lee, Seokcheon |
| contents | We show that a minimally extended varying-speed-of-light (meVSL) cosmology can alleviate the Hubble tension through a single parameter, b. This parameter both shortens the sound horizon at the drag epoch and modifies cosmological time dilation for transients, Delta_t_obs=(1+z)^n Delta_t_emit with n=1-b/4. The reduction in r_d raises the early-universe-inferred H_0 from CMB/BAO analyses, while departures of n from unity provide an independent, time-domain probe of b. Using Fisher forecasts for a DES-like survey, we estimate the supernova sample size required to detect sub-percent deviations in n under realistic statistical and systematic uncertainties. For illustration, b=0.03 yields z_drag = 1108 and r_d = 135 Mpc, consistent with H_0=~73 km/s/Mpc. We conclude that current and upcoming time-domain surveys can place competitive constraints on b and, jointly with CMB/BAO, provide a self-consistent observational test of meVSL's ability to alleviate the H_0 discrepancy. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_08840 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Alleviating the Hubble Tension via Cosmological Time Dilation in the meVSL Model Lee, Seokcheon General Physics We show that a minimally extended varying-speed-of-light (meVSL) cosmology can alleviate the Hubble tension through a single parameter, b. This parameter both shortens the sound horizon at the drag epoch and modifies cosmological time dilation for transients, Delta_t_obs=(1+z)^n Delta_t_emit with n=1-b/4. The reduction in r_d raises the early-universe-inferred H_0 from CMB/BAO analyses, while departures of n from unity provide an independent, time-domain probe of b. Using Fisher forecasts for a DES-like survey, we estimate the supernova sample size required to detect sub-percent deviations in n under realistic statistical and systematic uncertainties. For illustration, b=0.03 yields z_drag = 1108 and r_d = 135 Mpc, consistent with H_0=~73 km/s/Mpc. We conclude that current and upcoming time-domain surveys can place competitive constraints on b and, jointly with CMB/BAO, provide a self-consistent observational test of meVSL's ability to alleviate the H_0 discrepancy. |
| title | Alleviating the Hubble Tension via Cosmological Time Dilation in the meVSL Model |
| topic | General Physics |
| url | https://arxiv.org/abs/2509.08840 |