Are observers central to physics, or are they more accurately framed as bystanders to and byproducts of phenomena that exist independently of consciousness? In this interview from the long-running series Closer to Truth, Bernard Carr, an emeritus professor of mathematics and astronomy at Queen Mary University of London, traverses the double-slit experiment, the fine-tuning argument and more to explore what significance, if any, first-person observation holds in the realm of fundamental physics. In his conversation with the US presenter Robert Lawrence Kuhn, he doesn’t adopt a personal stance. Instead, he considers these persistent questions through a contemporary frame, assessing how discussions around them have evolved and where they stand among physicists today.
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