What's up in

space-time

<p>The effort to unify quantum mechanics and general relativity means reconciling totally different notions of time.</p>
Abstractions blog

Quantum Gravity’s Time Problem

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

<p>String theory has so far failed to live up to its promise as a way to unite gravity and quantum mechanics. At the same time, it has blossomed into one of the most useful sets of tools in science.</p>
string theory

The Strange Second Life of String Theory

String theory has so far failed to live up to its promise as a way to unite gravity and quantum mechanics. At the same time, it has blossomed into one of the most useful sets of tools in science.

<p><span style="font-weight: 400;">Just months after their discovery, gravitational waves coming from the mergers of black holes are shaking up astrophysics.</span></p>
astrophysics

Colliding Black Holes Tell New Story of Stars

Just months after their discovery, gravitational waves coming from the mergers of black holes are shaking up astrophysics.

<p>Richard Feynman&#8217;s famous diagrams weren’t just a way to do calculations. They represented a deep shift in thinking about how the universe is put together.</p>
Quantized Columns

How Feynman Diagrams Almost Saved Space

Richard Feynman’s famous diagrams weren’t just a way to do calculations. They represented a deep shift in thinking about how the universe is put together.

<p>The spokesperson for the Laser Interferometer Gravitational-Wave Observatory called it “a promising start to mapping the populations of black holes in our universe.”</p>
Abstractions blog

LIGO Reports Second Black-Hole Merger

The spokesperson for the Laser Interferometer Gravitational-Wave Observatory called it “a promising start to mapping the populations of black holes in our universe.”

<p>A satellite spotted a burst of light just as gravitational waves rolled in from the collision of two black holes. Was the flash a cosmic coincidence, or do astrophysicists need to rethink what black holes can do?</p>
astrophysics

After Black Holes Collide, a Puzzling Flash

A satellite spotted a burst of light just as gravitational waves rolled in from the collision of two black holes. Was the flash a cosmic coincidence, or do astrophysicists need to rethink what black holes can do?

<p>The path from a revolutionary set of equations to the detection of gravitational waves was strewn with obstacles and controversy, explains the physicist Daniel Kennefick — and the struggle continues.</p>
Q&A

From Einstein’s Theory to Gravity’s Chirp

The path from a revolutionary set of equations to the detection of gravitational waves was strewn with obstacles and controversy, explains the physicist Daniel Kennefick — and the struggle continues.

<p>Ripples in space-time have been detected a century after Einstein predicted them, launching a new era in astronomy.</p>
astrophysics

Gravitational Waves Discovered at Long Last

Ripples in space-time have been detected a century after Einstein predicted them, launching a new era in astronomy.

<p>Bizarre quantum bonds connect distinct moments in time, suggesting that quantum links — not space-time — constitute the fundamental structure of the universe.</p>
Physics

Quantum Weirdness Now a Matter of Time

Bizarre quantum bonds connect distinct moments in time, suggesting that quantum links — not space-time — constitute the fundamental structure of the universe.