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Degrees of Freedom

Degrees of Freedom

The boundless dimensions of math and physics

The Sciences

Superluminal Neutrinos Would Wimp Out En Route

[Note: October 5 update and clarification added at the bottom] Neutrinos that go beyond light speed? Not so fast, say two theoretical physicists.In a terse, peremptory-sounding paper posted online on September 29, Andrew Cohen and Sheldon Glashow of Boston University calculate that any neutrinos traveling faster than light would radiate energy away, leaving a wake of slower particles analogous to the sonic boom of a supersonic fighter jet...

October 2, 2011 — Davide Castelvecchi
The Sciences

Galactic Challenge Part III: The "Easy" Solutions

Scores of readers responded to my Galactic Challenge (proposed in Part I of this series), with lots of cool ideas. The challenge was to explain our concept of left and right to far away aliens; or to explain it to Martians over the phone, as Richard Feynman put it and as I describe in Part II.Here I will review the solutions that came up and I will discuss how one could implement them in practice...

September 12, 2011 — Davide Castelvecchi

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