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theoretical physics

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Illustration in which a bright red line results from many wavelike ripples overlapping.
explainers

How Our Reality May Be a Sum of All Possible Realities

By Charlie Wood
February 6, 2023
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Richard Feynman’s path integral is both a powerful prediction machine and a philosophy about how the world is. But physicists are still struggling to figure out how to use it, and what it means.

Video/image of a metronome whose arm is simultaneously ticking rightward and leftward.
quantum physics

How Quantum Physicists ‘Flipped Time’ (and How They Didn’t)

By Charlie Wood
January 27, 2023
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Two teams have made photons act as if time were simultaneously flowing in two directions. The experiments demonstrate a way to potentially boost the performance of quantum devices.

particle physics

Crucial Computer Program for Particle Physics at Risk of Obsolescence

By Matt von Hippel
December 1, 2022
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Maintenance of the software that’s used for the hardest physics calculations rests almost entirely with a retiree. The situation reveals the problematic incentive structure of academia.

quantum gravity

Physicists Create a Holographic Wormhole Using a Quantum Computer

By Natalie Wolchover
November 30, 2022
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The unprecedented experiment explores the possibility that space-time somehow emerges from quantum information.

A hand holds a spherical, starry universe that resembles almost all the balls in a nearby gumball machine. Two balls in the machine are a different color.
cosmology

Why This Universe? A New Calculation Suggests Our Cosmos Is Typical.

By Charlie Wood
November 17, 2022
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Two physicists have calculated that the universe has a higher entropy — and is therefore more likely — than alternative possible universes.

Video in which colorful pieces form in the center of a circule and grow as they move out to the periphery.
quantum gravity

Physicists Rewrite a Quantum Rule That Clashes With Our Universe

By Charlie Wood
September 26, 2022
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The past and the future are tightly linked in conventional quantum mechanics. Perhaps too tightly. A tweak to the theory could let quantum possibilities increase as space expands.

quantum gravity

Black Hole's Orbiting Ring of Light Could Encrypt Its Inner Secrets

By Thomas Lewton
September 8, 2022
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Physicists have discovered that the ring of photons orbiting a black hole exhibits a special kind of symmetry, hinting at a deeper meaning.

Representations of fields becoming neutrons, doughnuts, pretzels, soccer balls and other objects.
The Joy of Why

What Is Quantum Field Theory and Why Is It Incomplete?

By Steven Strogatz
August 10, 2022
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Quantum field theory may be the most successful scientific theory of all time, but there’s reason to think it’s missing something. Steven Strogatz speaks with theoretical physicist David Tong about this enigmatic theory.

Video in which a white circle appears in the center of a blue starry field and grows until whiteness engulfs the whole image.
explainers

How the Physics of Nothing Underlies Everything

By Charlie Wood
August 9, 2022
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The key to understanding the origin and fate of the universe may be a more complete understanding of the vacuum.


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