The Deceleration Parameter of the Universe

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The universe is not decelerating at all, it's accelerating. The expansion is going faster and faster. So we had to figure out how to make the universe expand faster. It turned out that that little term that Einstein had put in his equations at first to just keep the universe stable because he thought that the universe was not expanding but there's all these gravities. He putting that back to balance the gravity out and overcompensate and push galaxies apart from each other. But yeah, it turned out everything seemed to be fitting with an accelerating universe.

Cosmologists are always talking excitedly about the Big Bang and all the cool stuff that happened in the 14 billion years between then and now. But what about the future? We don't know for sure, but we know enough about the laws of physics to sketch out several plausible scenarios for what the future of our universe will hold. Katie Mack is a cosmologist who is writing a book about the end of the universe. We talk about the possibilities of a Big Crunch (and potential Big Bounce), a gentle cooling off where the universe gradually grows silent, and of course the prospect of a dramatic phase transition, otherwise known as the "bubble of quantum death." Which would make a great name for a band, I think we can all agree.

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Katherine (Katie) Mack received her Ph.D. in physics from Princeton University. She is currently an Assistant Professor at North Carolina State University, where her research centers on theoretical cosmology, including dark matter and black holes. She is also a member of NCSU’s Leadership in Public Science Cluster. Her upcoming book, The End of Everything, will be published in 2020.

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