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general relativity

Illustration of a black hole with a Cauchy horizon
general relativity

Mathematicians Disprove Conjecture Made to Save Black Holes

By Kevin Hartnett
May 17, 2018
Read Later

Mathematicians have disproved the strong cosmic censorship conjecture. Their work answers one of the most important questions in the study of general relativity and changes the way we think about space-time.

520px illustration for black hole echoes
Quantized Columns

Black Hole Echoes Would Reveal Break With Einstein’s Theory

By Sabine Hossenfelder
March 22, 2018
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Gravitational waves have opened up new ways to test the properties of black holes — and Einstein’s theory of gravity along with them.

Photograph of Albert Einstein in his office at the University of Berlin, published in the USA in 1920.
Abstractions blog

How Einstein Lost His Bearings, and With Them, General Relativity

By Kevin Hartnett
March 14, 2018
Read Later

By 1913, Albert Einstein had nearly completed general relativity. But a simple mistake set him on a tortured, two-year reconsideration of his theory. Today, mathematicians still grapple with the issues he confronted.

Animated illustration of a black hole in a cube of jelly
mathematical physics

To Test Einstein’s Equations, Poke a Black Hole

By Kevin Hartnett
March 8, 2018
Read Later

Two teams of researchers have made significant progress toward proving the black hole stability conjecture, a critical mathematical test of Einstein’s theory of general relativity.

An illustration of gravity as particles
quantum gravity

Physicists Find a Way to See the ‘Grin’ of Quantum Gravity

By Natalie Wolchover
March 6, 2018
Read Later

A recently proposed experiment would confirm that gravity is a quantum force.

A wormhole split in two with swirls of blue on one side and swirls of pink on the other with a ringed planet in the background.
theoretical physics

Newfound Wormhole Allows Information to Escape Black Holes

By Natalie Wolchover
October 23, 2017
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Physicists theorize that a new “traversable” kind of wormhole could resolve a baffling paradox and rescue information that falls into black holes.

Tim Maudlin
Q&A

A Defense of the Reality of Time

By George Musser
May 16, 2017
Read Later

Time isn’t just another dimension, argues Tim Maudlin. To make his case, he’s had to reinvent geometry.

quantum gravity

What Sonic Black Holes Say About Real Ones

By Natalie Wolchover
November 8, 2016
Read Later

Can a fluid analogue of a black hole point physicists toward the theory of quantum gravity, or is it a red herring?

cosmology

A Debate Over the Physics of Time

By Dan Falk
July 19, 2016
Read Later

According to our best theories of physics, the universe is a fixed block where time only appears to pass.


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