For over 100 years, two theories have shaped our understanding of the universe: quantum mechanics and Einstein’s general relativity. One explains the tiny world of particles; the other describes ...

Planets that orbit white dwarf stars should be too hot to host alien life, theories suggest. But a new study accounting for ...

Foreword / Diana Kormos Buchwald -- Preface -- Part I. Preliminaries. Introduction -- Einstein's first trip to America -- Structure and contents of The meaning of relativity -- Part II. The emerging ...

Here’s what you’ll learn when you read this story: Quantum gravity remains one of the big missing pieces of a Grand Unified Theory that could bridge quantum field theory and general relativity.

What if the universe remembers? A bold new framework proposes that spacetime acts as a quantum memory. For over a hundred ...

Astronomers detected in unprecedented detail a collision between two black holes. Their observations confirm predictions made ...

A new physics paper takes a step toward creating a long-sought "theory of everything" by uniting gravity with the quantum world. However, the new theory remains far from being proven observationally.

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The gravitational lensing that causes this rare phenomenon cannot be explained solely by looking at observable ...