Category Archives: Philosophy of Physics

Lawrence Krauss and Roy Sorensen

Lawrence Krauss (left) and Roy Sorensen (right) on origins and nothingness.

How did our universe get to be the way it is? Has our universe always existed, or did it arise from nothing? Is it even possible for something to come from nothing? Lawrence Krauss has argued that physicists have discovered some of the answers to these ancient philosophical questions; Krauss’s ideas are controversial among certain philosophers. In this conversation, Roy Sorensen and Krauss consider the connections between Darwinian evolution and Krauss’s views (13:50), discuss whether the scientific worldview is particularly depressing (22:41), examine the meaning of questions about “something rather than nothing” (35:25), and explore the nature of nothingness (47:18).

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Filed under Metaphysics, Philosophy of Physics, Philosophy of Science

Craig Callender and Sean Carroll

Craig Callender (left) and Sean Carroll (right) on the arrow of time and the multiverse.

According to the Past Hypothesis, the early universe was a low-entropy state, and entropy has been increasing ever since. Carroll thinks that the truth of the Past Hypothesis cries out for explanation; Callender thinks that its truth should be regarded as a brute law-like fact. They discuss this disagreement. Then (starting at 35:41) they discuss the explanatory merits of Carroll’s proposal that we inhabit a “baby universe” that is an offspring of another, higher-entropy universe.

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Filed under Philosophy of Physics, Philosophy of Science