Sara Walker on The Physics of Life and Planet-Scale Intelligence

What is life, and where does it come from? These are two of the deepest, most vexing, and persistent questions in science, and their enduring mystery and allure is complicated by the fact that scientists approach them from a myriad of different angles, hard to reconcile. Whatever else one might identify as universal features of all living systems, most scholars would agree life is a physical phenomenon unfolding in time. And yet current physics is notorious for its inadequacy with respect to time. Life appears to hinge on information transfer — but, again, what do we mean by “information,” and what it is relationship to energy and matter? If humankind can’t settle fundamental issues with these theoretical investigations, we might be missing other kinds of life (and mind) — not just in outer space, but here on Earth, right beneath our noses. But new models that suggest a vastly wider definition of life offer hope that we might — soon! — not only learn to recognize the biospheres and technospheres of other living worlds, but notice other “aliens” at home, and even find our place amidst a living cosmos.

Welcome to COMPLEXITY, the official podcast of the Santa Fe Institute. I’m your host, Michael Garfield, and every other week we’ll bring you with us for far-ranging conversations with our worldwide network of rigorous researchers developing new frameworks to explain the deepest mysteries of the universe.

This week on the show, we speak with SFI External Professor Sara Walker (Twitter, Google Scholar), Deputy Director of The Beyond Center at ASU, where she acts as Associate Professor in half a dozen different programs. In this conversation, we discuss her pioneering research in the origins of life and the profound and diverse implications of Assembly Theory — a new kind of physics she’s developing with chemist Leroy Cronin and a team of SFI and NASA scholars.  Sara likes to speculate out loud in public conversation, so strap in for an unusually enthusiastic, animated, and free-roaming conversation at the very bleeding edge of science. And be sure to check out our extensive show notes with links to all our references at complexity.simplecast.com.

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Mentioned Papers:

Intelligence as a planetary scale process
by Adam Frank, David Grinspoon & Sara Walker

The Algorithmic Origins of Life