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physics

Reaching for the Multiverse
Infinity and Beyond: The Ultimate Test

Multiverse Collisions May Dot the Sky

November 10, 2014

Early in cosmic history, our universe may have bumped into another — a primordial clash that could have left traces in the Big Bang’s afterglow.

Infinity and Beyond: The Ultimate Test

In a Multiverse, What Are the Odds?

November 3, 2014

Testing the multiverse hypothesis requires measuring whether our universe is statistically typical among the infinite variety of universes. But infinity does a number on statistics.

astrophysics

Dwarf Galaxies Dim Hopes of Dark Matter

October 25, 2014

For five years physicists have been tantalized by possible evidence of dark matter in the Milky Way’s center. But new results from small satellite galaxies have complicated the story.

BICEP2 graphic.
cosmology

‘Big Bang Signal’ Could All Be Dust

September 21, 2014

Cosmic dust in the high latitudes of the Milky Way could account for the entire swirl pattern that had been presented as proof of a leading Big Bang theory, according to a new data analysis from the Planck satellite.

Blanco telescope.
Q&A

Finding Dark Energy in the Details

September 18, 2014

The astrophysicist Joshua Frieman seeks to pinpoint the mysterious substance driving the accelerating expansion of the universe.

particle physics

Quark Quartet Fuels Quantum Feud

August 27, 2014

Newly discovered particles are forcing physicists to extend their simple picture of subatomic interactions or replace it with a more nuanced understanding.

theoretical physics

At Multiverse Impasse, a New Theory of Scale

August 18, 2014

Physicists have begun to explore the idea that mass and length may not be fundamental properties of nature. The hypothesis could help to avoid the conclusion that our world is just a weird bubble in an endlessly foaming multiverse.

2014 Fields Medal and Nevanlinna Prize

In Noisy Equations, One Who Heard Music

August 12, 2014

Martin Hairer was named a 2014 Fields medalist for an epic masterpiece in stochastic analysis that colleagues say “created a whole world.”

Katherine Freese
Q&A

In Search of Dark Stars

July 22, 2014

Katherine Freese, a physicist who will soon lead the Nordic Institute for Theoretical Physics, reflects on the hunt for dark matter and how dark matter heating may have produced the first stars.