Sabine Hossenfelder

Contributing Columnist

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Black Hole Echoes Would Reveal Break With Einstein’s Theory

Gravitational waves have opened up new ways to test the properties of black holes — and Einstein’s theory of gravity along with them.

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Why an Old Theory of Everything Is Gaining New Life

For decades, physicists have struggled to create a quantum theory of gravity. Now an approach that dates to the 1970s is attracting newfound attention.

Physics

String Theory Meets Loop Quantum Gravity

Two leading candidates for a “theory of everything,” long thought to be incompatible, may be two sides of the same coin.

About the author

Sabine Hossenfelder is a theoretical physicist based at the Frankfurt Institute for Advanced Studies in Frankfurt, Germany. She frequently writes about foundational issues in physics on her blog Backreaction.