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Elliot Nelson
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111 followers
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In this post we’ll look at one of strongest pillars of evidence for the hot Big Bang. (For an introduction to the Big Bang, see this post.) The decisive evidence for this extremely hot and dense origin of the universe as we know it is the thermal…
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(Continuing from “The Expanding Universe.”) The expansion of the universe was also a vindication of Einstein’s theory of gravity, general relativity. Although it wasn’t understood at first, general relativity predicted either an expanding or contracting…
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The universe is expanding. As explained here, this makes the past history of the universe a window into unknown high-energy physics. In this post I’ll address two questions: What does it mean to say that the universe is expanding? And how do we know that…
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The Shape of the Universe (is there a boundary to the universe?)

You may have wondered at one point, is there an edge to the universe? On the one hand, the universe might simply be infinite in space, simply extending forever. Such a scenario is a perfectly good solution of Einstein’s equations of general relativity,…
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Recently, at the conference for the American Scientific Affiliation, I gave a short talk on the question “Is our universe a biased sample?” You can listen to it and see a pdf of the slides, and see more info on this page. The question here is, since we…
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New Blog: Kosmophilus
Dear Readers and Followers, For those who have followed some of my writings here in this remote corner of the blogosphere, I want to let you know that I have started a new blog: Kosmophilus , Explorations in Cosmology and Theoretical Physics.  The goal of t...
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What did the Big Bang look like?  A landscape of ripples in space and time: http://tinyurl.com/n3y6kh4
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