Cosmological Koans Pdf

[Paul]

Inhis new book, Cosmological Koans: A Journey to the Heart of Physical Reality, physicist Anthony Aguirre explores deep questions about the nature of reality, using an approach inspired by Zen koans to take the reader on a thought-provoking tour of the cosmos and the core ideas of modern physics.

In Zen Buddhism, koans are short parables or questions meant to confront the practitioner with the inadequacy of conventional concepts and habits of thought. Similarly, Aguirre's "cosmological koans" confront the reader with the unexpected nature of the world as described by physics and the mind-boggling ways in which it differs from our subjective experience or intuitive understanding of things.

"I wanted to convey that sense of mystery and wonder that comes from seeing reality in a new way," said Aguirre, a professor of physics and holder of the Faggin Family Presidential Chair for the Physics of Information at UC Santa Cruz.

The book covers a wide range of topics, woven together with a fictional story line that recounts a journey from Italy to Japan. Multiple universes, the nature of time, the meaning of quantum theory, and entropy and information are among the subjects explored in short chapters that manage to convey mind-bending ideas in a way that is accessible and entertaining.

Aguirre celebrates the accomplishments of modern physics in penetrating the mysteries of nature, while showing how many thorny questions remain unsettled. "We should take credit for how well we've done in understanding reality, while acknowledging that a lot of those concepts are more tricky and slippery than you might think."

Another key idea in the book is the importance of information as a coequal constituent of the universe along with matter and energy. The content of the book was inspired not only by Aguirre's own research, which covers a variety of topics in theoretical cosmology, but also by his work as associate scientific director of the Foundational Questions Institute, which supports research on innovative ideas in cosmology and physics that are unlikely to be supported by conventional funding sources.

MIT physicist Max Tegmark, who co-founded the institute with Aguirre, had high praise for Cosmological Koans. "Reading it won't leave you with all the answers (we physicists are still searching for them), but it will leave you with a deepened sense of mystery, awe, and appreciation both for your universe and for your own life and experience therein," he wrote.

Aguirre will give a public talk on Tuesday, June 18, at the UC Santa Cruz Silicon Valley Campus in Santa Clara as part of the Kraw Lecture Series on Science and Technology. For more information and registration, visit specialevents.ucsc.edu/kraw-lecture.

is a professor of physics at the University of California, Santa Cruz, and the associate scientific director of the Foundational Questions Institute, a nonprofit organisation that he co-founded and co-runs. His most recent book is Cosmological Koans: A Journey to the Heart of Physical Reality (2019).

A feeling grew in the pit of my stomach that the Universe really is a pretty mysterious place. The mystery is not about why the Universe has some particular properties rather than others, but about the connection between those properties and our very existence as living, conscious beings contemplating those properties. Not only are you intimately connected to the Universe on the largest scales, you are central. This is not to deny that you are in some sense an infinitesimal arrangement of dust on one small planet out of billions of trillions in our observable universe, which might well be one of many universes. But you are also a giant: a thinking, conscious being responsible for giving meaning, and even existence, to the universe you inhabit.

Sometime after, I was recounting my thoughts to a good friend who happens to be a longtime practitioner of Zen Buddhism. He noted that my experience reminded him of Zen koans, vignettes that embody teachings about reality as explored by Zen adepts. Through koans, a teacher can confront a student with a situation that, while initially baffling, can be resolved through added insight rather than more knowledge or previous experience.

Right now, as you read this, a baby in India is taking its first breath, and an old woman her last. A young woman and her love are sharing their first kiss. Lightning flashes across a dark sky. The wind blows through the hair of a solitary hiker in the Sahara desert.

But imagine yourself in the thunderstorm that is happening somewhere on Earth at this moment. You notice that a flash of lightning and the accompanying thunder happen at different times by your internal clock. The interpretation is simple: the thunder is a soundwave travelling at the speed of sound and takes some time to reach you; the flash, travelling at the vastly faster speed of light, takes an imperceptible amount of time. Just as for the falling leaf, this light-travel delay is so short that you generally consider the strike to happen at the same time that you see it.

On larger scales, however, the effects are quite noticeable and even dramatic. When commanding missions elsewhere in the solar system, space scientists have to contend with delays of minutes or hours between the occurrence of events and the arrival of the signals describing them. Looking at the night sky, you ponder stars as they were tens, hundreds, or even thousands of years ago. And when astronomers observe distant galaxies as they rush away from ours because of the cosmic expansion, they are looking back billions of years through cosmic history; not only were galaxies younger, but the universe itself was expanding at a different rate.

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