Comment on Astronomers spot the first “bounce” in our Universe

• btaf45@lemmy.world ⁨1⁩ ⁨year⁩ ago

  The universe was infinite with no edges when the big bang occurred, just like now.

  We don’t know that. Here is a depiction of infinite inflation, the most popular version of the standard model, spawning pocket universes with boundaries.

  bigthink.com/…/https___specials-images.forbesimg.…

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  • Kata1yst@kbin.social ⁨1⁩ ⁨year⁩ ago

    Well no, we don't know that. But that's the current scientific consensus. Wouldn't make much sense to lay out every theory currently not disproven to answer a simple question though.

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    • btaf45@lemmy.world ⁨1⁩ ⁨year⁩ ago

      It’s not a consensus at all. The reason why the FLRW model does not include modelling boundaries is because it is very hard to model boundaries, not because they are unlikely.

      en.wikipedia.org/wiki/Shape_of_the_universe

      Assuming a finite universe, the universe can either have an edge or no edge. Many finite mathematical spaces, e.g., a disc, have an edge or boundary. Spaces that have an edge are difficult to treat, both conceptually and mathematically. Namely, it is very difficult to state what would happen at the edge of such a universe. For this reason, spaces that have an edge are typically excluded from consideration.

      to respond to your pocket universe theory,

      It’s not my “pocket universe theory”. It is the theory of Infinite Inflation, the most popular version of the standard model.

      That doesn’t mean there can’t be other universes though.

      Those “pocket universes” are not really other universes. They are physically connected to our universe. They are called pocket universes because they are too far away to communicated with. The depiction I showed you is not an abstraction, it is what is believed to be the actual geometric shape.

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