广义相对论与量子宇宙学
[提交于 2024年12月9日
(此版本)
, 最新版本 2025年1月16日 (v2)
]
标题: TO_BE_TRANSLATED: Geometric distances between closed universes
标题: Geometric distances between closed universes
摘要: TO_BE_TRANSLATED: The large-scale structure of the universe is well-approximated by the Friedmann equations, parameterised by several energy densities which can be observationally inferred. A natural question to ask is: how different would the universe be if these densities took on other values? While there are many ways this can be approached depending on interpretation and mathematical rigour, we attempt an answer by building a "history space" of different cosmologies. A metric is introduced after overcoming technical hurdles related to Lorentzian signature and infinite volume, at least for topologically-closed cases. Geodesics connecting two points on the superspace are computed to express how distant -- in a purely geometric sense -- two universes are. Age can be treated as a free parameter in such an approach, leading to a more general mathematical construct relative to geometrodynamical configuration-space. Connections to bubble inflation and phase transitions are explored.
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