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Philosophy, sociology and religion

Philosophy, sociology and religion

How entropy might increase backwards in time – as well as forwards

25 Jan 2022
Taken from the January 2022 issue of Physics World where it first appeared under the headline "The twin streams of time".

Sidney Perkowitz reviews The Janus Point: a New Theory of Time by Julian Barbour

distorted clock faces
Time complexity Is time an arrow that only moves forward? Or is it symmetric, moving in opposite directions? (Courtesy: iStock/funky-data)
We live life forward as time flows from past to future, and believe that any closed system, like a b

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Sidney Perkowitz is Candler Professor of Physics Emeritus, Emory University, US. His latest books are Physics: A Very Short Introduction and Science Sketches (2022). sidneyperkowitz.net
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