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Quantum gravity

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A Physicist’s Physicist Ponders the Nature of Reality

November 28, 2017

Edward Witten reflects on the meaning of dualities in physics and math, emergent space-time, and the pursuit of a complete description of nature.

Newfound Wormhole Allows Information to Escape Black Holes

October 23, 2017

Physicists theorize that a new “traversable” kind of wormhole could resolve a baffling paradox and rescue information that falls into black holes.

To Solve the Biggest Mystery in Physics, Join Two Kinds of Law

September 7, 2017

Reductionism breaks the world into elementary building blocks. Emergence finds the simple laws that arise out of complexity. These two complementary ways of viewing the universe come together in modern theories of quantum gravity.

Joe Polchinski’s Restless Pursuit of Quantum Gravity

August 7, 2017

The pot-stirring string theorist and quantum gravity theorist never sits still for long.

Where Gravity Is Weak and Naked Singularities Are Verboten

June 20, 2017

Recent calculations tie together two conjectures about gravity, potentially revealing new truths about its elusive quantum nature.

Physicists Uncover Geometric ‘Theory Space’

February 23, 2017

A decades-old method called the “bootstrap” is enabling new discoveries about the geometry underlying all quantum theories.

Quantum Gravity’s Time Problem

December 1, 2016

The effort to unify quantum mechanics and general relativity means reconciling totally different notions of time.

What Sonic Black Holes Say About Real Ones

November 8, 2016

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

Physicists Hunt for the Big Bang’s Triangles

April 19, 2016

The story of the universe’s birth — and evidence for string theory — could be found in triangles and myriad other shapes in the sky.

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