Can the universe be infinite? – IV – Continuity equations of the cosmic flow and invariance principles in Newtonian cosmology

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We continue our journey to find an answer to the question whether the universe could be infinite in space. With some rather elementary considerations we have come up with an equation for the dynamics of the cosmos, namely the so … Read More

Can the universe be infinite? – III – basic solutions of the Friedmann equation

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In the first post of this series we have picked up the question whether a Big Bang at the beginning of the universe and a finite speed of light imply a finite universe. In the 2nd post we saw that … Read More

Can the universe be infinite? – II – Friedmann equation and scaling factor by Newtonian considerations

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This post series is about the question whether one can exclude by some simple arguments that the universe is infinite. I write about it because some presently popular science videos, which illustrate the Big Bang as an explosion, may create … Read More

Special relativity and the rod/slot paradox – XX – sequences of relativistic boosts along non-collinear axes

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My post series on the rod/slot paradox in two dimensions slowly but surely comes to an end. I hope that my readers have gained some new insights and a deeper understanding of the root of the paradox: The change of … Read More

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