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Davide Castelvecchi Profile picture
Davide Castelvecchi
@dcastelvecchi
Journalist covering physics, astronomy, math, and technology news @Nature
May 9, 2023 • 19 tweets • 4 min read
Physicists have created (or is it simulated?) "non-abelian anyons" on a @QuantinuumQC computer. It's the convergence of several threads of research that have involved some of the most high-powered physics and math of the last half century. A 🧵on those 🧵
nature.com/articles/d4158… Physics thread #1: in 1977, Norwegian physicists Jon Magne Leinaas and Jan Myrheim were dissatisfied with the way most quantum physics textbooks discuss multiple-particle states — because let’s face it, they suck at that.
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Nov 12, 2022 • 17 tweets • 5 min read
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Why are mathematicians interested in the distribution of prime numbers, and what do they actually mean by that?
A 🧵 on the Riemann hypothesis and Yitang Zhang's latest preprint on the Landau-Siegel zeros conjecture, which I covered yesterday
nature.com/articles/d4158… 2/
Questions on the statistics of prime numbers date back at least to one of the greatest mathematicians in history, the German Carl Friedrich Gauss, who in 1792 or 1793 (when he was at most 16 years old) noticed a pattern in their frequency
(Picture credit Mascdman/Wikimedia) Image
May 25, 2022 • 8 tweets • 5 min read
The recent @ehtelescope picture of the Milky Way's super massive black hole is a crucial piece in the puzzle of our galaxy's central region.
My latest article, and a 🧵
nature.com/articles/d4158… Sagittarius A* image courte... The immediate response of many astrophysicists was surprise: the rotation of Sagittarius A* (or at least of the matter falling into it) seems to be unrelated to that of the galaxy — which se see 'edge on' because we're in it — and closer to being 'face on' [...]
Feb 8, 2022 • 14 tweets • 4 min read
When was quantum spin discovered?
#otd exactly 100 years ago, Otto Stern and Walther Gerlach made what would become one of the most iconic observations in the history of physics: a magnetic field split a beam of silver atoms neatly into two beams
scientificamerican.com/article/it-has… Image from Issachar Unna and Tilman Sauer, Ann. Phys. 525, A The Stern-Gerlach experiment was not the first evidence for spin: that title probably belongs to Thomas Preston’s observation of the anomalous Zeeman effect in spectroscopy, in 1898. Mercury vapor image by Warren Leywon/Wikipedia
Apr 26, 2019 • 19 tweets • 5 min read
So, @naturenews, why did you hype up the possibility that today's event was a neutron star–black hole merger?
I'm glad you asked.
[Warning: monster thread ahead]
[Image credit: A. Tonita, L. Rezzolla, F. Pannarale]
nature.com/articles/d4158… After all, @LIGO and @ego_virgo’s own estimate said it only had a 13% chance to be that type of event.
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gracedb.ligo.org/superevents/S1…