of course antimatter falls down

The Role of Gravitation in Physics: Report from the 1957 Chapel Hill Conference: edition-open-sources.org/sour...
Experiments to Measure The Force of Gravity on Positrons Fairbank and Whittburn (because the Nature paper is not online, boooooo): s3.cern.ch/inspire-prod-files...
12th International Conference on Atomic Physics: apps.dtic.mil/sti/pdfs/ADA259...
Observation of the effect of gravity on the motion of antimatter: www.nature.com/articles/s4158...
Maxwell’s Dynamical Theory of the Electromagnetic Field: royalsocietypublishing.org/do...
Read this if you haven’t! IT IS SO GOOD THOUGH!
Anti-apples: www.slac.stanford.edu/pubs/sl...
Scientists Disappointed to Find That Antimatter Falls When You Drop It: futurism.com/scientists-disap...
MICROSCOPE Mission: journals.aps.org/prl/abstract...
My patreon for more videos like this (new video each month!): / acollierastro

[@bradwilliams7198]

I actually took a thermo class from Fairbank as an undergraduate. Sometime later, a different professor made a remark in a class he was teaching: "Sometimes a theorist will tell you about some phenomenon his theory has predicted, and ask if you can detect it experimentally. Then you do a "back of the envelope" calculation and realize the effect is about 10 orders of magnitude less than you can expect to detect. And unless you're Bill Fairbank, you don't even try."

[@IsaacMayerCreativeWorks]

to quote XKCD:

[@RealHypeFox]

"You just have to check"

[@PeteStMarie]

I about choked on the the cookie I was eating when she said "Michio Kaku would have found it in his garage when he was a teenager" Thanks Angela!

[@tomofthetomb]

Make sure to put the "I matter" in antimatter

[@ExecutionSommaire]

Angela is the kind of professor I would have had a moral duty not to procrastinate the homework

[@MonochromeWench]

I imagine they didn't do the experiment with real hydrogen because it will be very difficult to detect individual hydrogen atoms. Anti-hydrogen nicely annihilates and releases a burst of photons indicating where it went. Normal hydrogen not so easy to detect.

[@scottrobinson4611]

This really captures the essense of science for me.

[@ijpg-fd7qn]

One reason this experiment is so awesome is that its taking the very first physics experiment you do ever, dropping a small ball and a big ball and seeing which one hits the ground first, and scales it up to 11. Lets take the tiniest, weirdest ball we can find and see if it still falls the same way. It's so simple yet it took years and years of effort and knowledge to even attempt for a result that is the most intuitive thing in the world. There's just something really satisfying about that idk

[@IanStreet]

Of course patron names scroll up…but if there was ever a video for a list to fall from top to bottom of a screen, this would be it.

[@fernlovebond]

I understand only a fraction of most the content you produce, but I

[@brianl7321]

As a math person I loved hearing you explain this. It's like someone saying "well of course 2 minus 2 is 0" but no one being able to

[@michael1567]

I cannot overstate how fun it is to learn about physics the way you make videos

[@go-away-5555]

Ah, but how do we know it doesn't fall anti-down. Please listen to my lecture where I disprove physics by making basic math errors.

[@FrancisFjordCupola]

On Dirac's anti-matter and/or/versus anti-gravity... basically Dirac found a solution with x-squared and since minus times minus equals positive, he tried to get rid of the minus result and could not and then stubbornly accepted that it might indicate the minus variant is physically real. Whereas the string theory crowd goes "hey this is just like Dirac."

[@21stCentDissonance]

I was a PhD at CERN working in the antimatter factory where ALPHA-G was located. I worked for GBAR, a rival experiment but given the small amount of physicists in experimental antimatter physics there is a lot of overlap of staff as they rotate through contracts. ALPHA was always likely to be first to report because they were adapting the original experimental apparatus that was used just for trapping antimatter atoms. The question for ALPHA G was could they get enough statistical validity and resolution to get the result. AEGIS and GBAR went the other direction, building apparatus that would have very clear resolution of but only the direction \bar{g} but the magnitude of it. ALPHA G's results in 2017 were looking hopeful but they were working out the simulations for the magnetic fake gravity. I was at the Royal Academy conference when Geoff (or maybe Jeff) explained their approach and it was one of the more interesting presentations

[@coleb.t.6905]

I’m a musician with little calculus knowledge, but I came across your channel a year ago, and have watched all of your videos because you are such an amazing story teller. Keep up the good work

[@mehill00]

I’m so glad you said they should’ve done Hydrogen too. I’m an experimentalist and I think this is a strong comment pointing out an important weakness. Not saying the work shouldn’t have been published, by any means, but it is the first thing I thought of: why are they comparing to simulations?! I hope they will follow up with both H and anti-H. If I were the referee I would have made sure they addressed why they didn’t do the H test as well (I imagine there’s a good reason; and I haven’t read it so I’m just assuming they didn’t address it or you would have mentioned it).

[@GSBarlev]

Another experiment shooting holes (🥁) in Dirac's Hole Theory! I love how you explain the need for experiments when the math says something is "not

[@ho77iday]

This is my favorite channel on youtube.