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Abstract <p>According to the Křížek–Somer hypothesis [New Astron. <b>17</b>, 1 (2012); Grav. Cosmol. <b>21</b>, 59 (2015)], a biological evolution of the Earth is possible only at certain values of the Hubble parameter, because the increasing luminosity of the Sun should be compensated by the increasing orbital radius of the Earth due to the local Hubble expansion, thereby keeping the Earth’s surface temperature sufficiently stable. Here, we examine this hypothesis in light of the recent data on the surface temperature on the early Earth, thereby imposing a few constraints on the admissible values of the local Hubble parameter. As follows from our analysis, the Křížek–Somer mechanism might be a valuable tool to resolve the important geophysical and paleontological puzzles, but the particular value of the local Hubble parameter is substantially affected by the current uncertainties in our knowledge about the temperature and other properties of the early Earth.</p>

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Křížek–Somer Anthropic Principle and the Problem of Local Hubble Expansion

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  • 发表日期：

    2025年6月11日

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  • Yurii V. Dumin,
  • Eugen S. Savinykh

摘要

Abstract

According to the Křížek–Somer hypothesis [New Astron. 17, 1 (2012); Grav. Cosmol. 21, 59 (2015)], a biological evolution of the Earth is possible only at certain values of the Hubble parameter, because the increasing luminosity of the Sun should be compensated by the increasing orbital radius of the Earth due to the local Hubble expansion, thereby keeping the Earth’s surface temperature sufficiently stable. Here, we examine this hypothesis in light of the recent data on the surface temperature on the early Earth, thereby imposing a few constraints on the admissible values of the local Hubble parameter. As follows from our analysis, the Křížek–Somer mechanism might be a valuable tool to resolve the important geophysical and paleontological puzzles, but the particular value of the local Hubble parameter is substantially affected by the current uncertainties in our knowledge about the temperature and other properties of the early Earth.