The Emperor’s Enduring Mind

Roger Penrose

I recently picked up ‘The Impossible Man’ - journalist Patchen Barss’ biography of British mathematical physicist and philosopher Roger Penrose with some anticipation but more wariness. Penrose is, after all, one of the greatest living physicists, second only to Einstein in some respects.

A childhood icon - ‘The Emperor’s New Mind’ disrupted my mind when I was 12 - Penrose is a thinker whose insights into black holes, space-time and the deep structure of reality have left even his most brilliant peers racing to keep up.

As I feared, Barss’ book is not what Penrose deserves. It tells us what kind of man he is, but hardly enough about the ideas that make him singular.

This is not surprising. Penrose has always resisted the easy narratives that biographers crave. Unlike Stephen Hawking, whose ‘A Brief History of Time’ became a cultural phenomenon despite being one of the most unread bestsellers of all time, Penrose never sought to popularize for the sake of mass appeal. Unlike Michio Kaku, whose cheerful speculations about parallel universes and time travel have made him a fixture of science documentaries, Penrose has little interest in playing to the crowd.

His classics like ‘The Road to Reality,’ ‘Fashion, Faith and Fantasy in the New Physics of the Universe’ - are uncompromising works, brimming with deep mathematics and philosophical rigor. They do not pander. They demand.

That is the core of what makes Penrose different. His work is not about selling physics to the public but about understanding reality. And that reality, to Penrose, has always been geometric.

His early breakthroughs were in mathematical physics, where he developed the Penrose diagram - a way of mapping the twisted fabric of space-time around black holes. In 1965, he demonstrated that singularities (points where gravity becomes infinite) are an inevitable consequence of Einstein’s general relativity. Hawking would later extend this work, but it was Penrose who laid the mathematical foundations.

He devised Penrose tilings, non-repeating patterns that cover an infinite plane without gaps. This idea turned out to have deep implications for quasicrystals, materials whose atomic structures mirror these patterns. He even took a toilet-paper manufacturer to court for using his tiling design without permission, arguing that their quilted patterns could, in theory, be infinitely extended without repetition. (He won)

But it is in cosmology that Penrose has been at his most audacious. His Conformal Cyclic Cosmology (CCC), outlined in ‘Cycles of Time,’ suggests that the universe is not a one-time event but an infinite series of “aeons,” where the end of one cosmos seeds the birth of another.

When black holes swallow all the matter in the universe and eventually evaporate, what remains is a sea of photons - particles that do not experience time. It undergoes a conformal transformation, wherein the universe, reduced to massless and timeless photons, is rescaled into a new Big Bang. Penrose claims evidence lies in Cosmic Microwave Background data, recently supported by a team of researchers, though the topic remains controversial.

Mainstream physics leans heavily toward inflationary models, where the early universe underwent a rapid expansion. But Penrose has never been one to follow the pack. His critiques of string theory (beloved by many physicists, including Kaku) are unsparing - dismissing it as a mathematical game, devoid of experimental grounding. Likewise, he has been deeply sceptical of the many-worlds interpretation of quantum mechanics, which postulates every quantum event spawns an infinite number of parallel universes. To Penrose, this is fantasy, not physics.

It is precisely this independence of thought that makes Penrose indispensable. In a scientific landscape increasingly dominated by theories that prioritize mathematical beauty over empirical testability, he remains a bulwark against intellectual complacency.

(The author is a U.S.-based data scientist)