Some questions on the Cosmological Principle

Thread starter rede96
Start date Nov 12, 2015
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Cosmological Cosmological principle Principle

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The cosmological principle suggests that the universe is homogeneous and isotropic on large scales, but this does not imply that it is infinite; it can be finite yet unbounded, similar to a 3-sphere. Gravitational forces do not cancel out across large distances, and the universe is not static; instead, the Friedmann equations describe how the universe expands over time. The idea of an edge to the universe is also incorrect, as both finite and infinite models can exist without boundaries. Observations indicate the universe is "pretty flat," but this does not rule out a very large finite universe. Ultimately, the expansion of the universe does not require a higher-dimensional space; it can occur within the three-dimensional space we experience.

Nov 25, 2015

Pizza

No, I just remember that the LCDM model ist the present favorite one. But please, do not ask me what exactly these letters are representing, even if read about it. I even discussed something in German already, but still have problems. You said it: look on the math. That is what I should do, you are right. And your explanations and answers were a good lesson for me today, not kidding, think I understood a little better already, without math. But math is the key, am convinced now.