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gravity

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quantum gravity

The Physicist Who Glues Together Universes

By Charlie Wood
May 25, 2023
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Renate Loll has helped pioneer a radically new approach to quantum gravity. She assumes that the fabric of space-time is a blend of all possible fabrics, and she has developed the computational tools needed to calculate the far-reaching implications of that assumption.

The Joy of Why

Are There Reasons to Believe in a Multiverse?

By Steven Strogatz
May 17, 2023
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Several areas of physics suggest reasons to think that unobservable universes with different natural laws could lie beyond ours. The theoretical physicist David Kaplan talks with Steven Strogatz about the mysteries that a multiverse would solve.

nonlinear dynamics

New Proof Finds the ‘Ultimate Instability’ in a Solar System Model

By Jordana Cepelewicz
May 16, 2023
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For the first time, mathematicians have proved that planetary orbits in a solar system will always be unstable.

golden planets look like they're moving through a twisting current
The Joy of Why

How Will the Universe End?

By Steven Strogatz
February 22, 2023
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Big Freeze, Big Rip, Big Crunch, Bounce or vacuum decay? Steven Strogatz speaks with theoretical cosmologist Katie Mack about the five ways that scientists think the universe could come to an end.

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.

A woman stands in a darkened laboratory next to a shallow tank of water that glows green.
Q&A

She Turns Fluids Into ‘Black Holes’ and ‘Inflating Universes’

By Thomas Lewton
December 12, 2022
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By using fluids to model inaccessible realms of the cosmos, Silke Weinfurtner is “looking for a deeper truth beyond one system.” But what can such experiments teach us?

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.

Illustration of a rotating object that warps the space-time fabric around itself, as seen by eyes located in different places
general relativity

Mass and Angular Momentum, Left Ambiguous by Einstein, Get Defined

By Steve Nadis
July 13, 2022
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Surprising as it may sound, 107 years after the introduction of general relativity, the meanings of basic concepts are still being worked out.

Illustration of planets and other objects floating above the deformable sheet of space-time.
The Joy of Why

Where Do Space, Time and Gravity Come From?

By Steven Strogatz
May 4, 2022
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Einstein’s description of curved space-time doesn’t easily mesh with a universe made up of quantum wavefunctions. Theoretical physicist Sean Carroll discusses the quest for quantum gravity with host Steven Strogatz.


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