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gravity

A falling apple.
Abstractions blog

Why Gravity Is Not Like the Other Forces

June 15, 2020

We asked four physicists why gravity stands out among the forces of nature. We got four different answers.

A black hole shooting thunderbolts.
quantum gravity

Black Hole Paradoxes Reveal a Fundamental Link Between Energy and Order

May 28, 2020

By chewing on the problems posed by “extremal” black holes, physicists have exposed a surprising and universal connection between energy and entropy.

Animation of black hole formation.
mathematical physics

New Math Proves That a Special Kind of Space-Time Is Unstable

May 11, 2020

Einstein’s equations describe three canonical configurations of space-time. Now one of these three — important in the study of quantum gravity — has been shown to be inherently unstable.

Animation of a black hole rotating.
Abstractions blog

Black Hole Singularities Are as Inescapable as Expected

December 2, 2019

For the first time, physicists have calculated exactly what kind of singularity lies at the center of a realistic black hole.

symmetry

The Simple Idea Behind Einstein’s Greatest Discoveries

June 26, 2019

Lurking behind Einstein’s theory of gravity and our modern understanding of particle physics is the deceptively simple idea of symmetry. But physicists are beginning to question whether focusing on symmetry is still as productive as it once was.

Art for "How Space and Time Could Be a Quantum Error-Correcting Code"
space-time

How Space and Time Could Be a Quantum Error-Correcting Code

January 3, 2019

The same codes needed to thwart errors in quantum computers may also give the fabric of space-time its intrinsic robustness.

Art for "New Studies Rescue Gravitational-Wave Signal From the Noise"
gravitational waves

New Studies Rescue Gravitational-Wave Signal From the Noise

December 13, 2018

Two independent papers vanquish lingering doubts about LIGO’s historic discovery of gravitational waves.

Abstractions blog

Why Black Hole Interiors Grow (Almost) Forever

December 6, 2018

The renowned physicist Leonard Susskind has identified a possible quantum origin for the ever-growing volume of black holes.

Art for "How Holography Could Help Solve Quantum Gravity"
In Theory

How Holography Could Help Solve Quantum Gravity

November 14, 2018

In the latest campaign to reconcile Einstein’s theory of gravity with quantum mechanics, many physicists are studying how a higher dimensional space that includes gravity arises like a hologram from a lower dimensional particle theory.