Are Axions Dark Matter?

13 868
Joye Colbeck
Joye Colbeck - 2 hours ago
A weakly interacting small particle - a WISP?
Astromations - 15 hours ago
Yes. Yes they are!
Ricardo González
Ricardo González - 19 hours ago
Great video!
Zepha21 - Day ago
Are humans great apes?
ED_DY TV - 2 days ago
Traduction arab plz💕
M W - 2 days ago
Did he do a 5 minute commercial for NORD VPN?
Daniel Coker
Daniel Coker - 2 days ago
Its data, not data.
Heineken Skywalker
Heineken Skywalker - 2 days ago
I did comment that it was a chimp.
So ein Spast
So ein Spast - 2 days ago
I really like the Tekken 5 main menu music
James Black
James Black - 2 days ago
Watching you move I think your camera's exposure time is too small.
Verners Lejietis
Verners Lejietis - 3 days ago
Wow! Even though, the Consiousness influencing QM video is more to my liking, I am glad I did not miss this one. I went in it without a clue what an Axion is, but your explanation with the graphics was top notch. If only i was a kid way back in school, your content is really inspirational.
CleverWire - 3 days ago
In an infinite sized universe bag (for lack of a better sciency word) that contains infinitely sized universes where the bag's existence expanded infinite time wouldn't the probability this text message be typed already in the past by an identical me be 100%?
pvc - 3 days ago
"CP Violation"
Attention, ground units - anti-citizen reported in this community. Code: lock, cauterize, stabilize.
Brenden Carr
Brenden Carr - 3 days ago
3:36 okay wow, the strong CP problem really sounds like the intersection in which we need to keep a very close eye on. Our error, our missing connection, lies somewhere in the maths which cause this mismatch. I absolutely love it! I almost want to go to college to learn everything about these problems, just so I can help figure it out. It's so exciting and enticing, to see things like this unsolved to this day
Sazy Plew
Sazy Plew - 3 days ago
Someone - 4 days ago
I think a better term for "symmetric" is.. Bipolar.
Vini - 4 days ago
Background music sounds like Twin Peaks mystery song.
Vini - 4 days ago
The standard model / QFT is slowly reaching its limit. Extrapolating from already existing equations will eventually just make you go in circles. You need some genuinely new ideas.
King Ronin
King Ronin - 4 days ago
My question is why is a chiral neutron predicted to have an electrical charge? The positive version of an electron and a negative proton should mathematically produce a neutron of the chiral constituents but of similar basic properties?
civota mu az
civota mu az - 4 days ago
Would watch this whole video but goddamn it feels like Billy Mitchel is waterboarding me
Binyamin Tsadik
Binyamin Tsadik - 4 days ago
Check out this paper:
You are saying the same thing.
Dr.V - 4 days ago
Wonderfully informative and fantastically interesting. Thank you kindly @PBS Space Time for making this.
Make Racists Afraid Again
Please don't say "visa" versa.
Michael Sander
Michael Sander - 4 days ago
To me, PBS Space Time is single best physics channel for folks who studied college-level physics, but didn't quite make it to (or through) physics grad school. Agree?
Inspiración Original
Inspiración Original - 4 days ago
so... this means the Axiom could be used to support photon decay as an explication for dark matter?
Badger - 4 days ago
I think axions and the theory itself could for the most part be replaced with formative causation as an account for dark matter/energy or other potential issues in our simulations.
Charlie Meyer
Charlie Meyer - 4 days ago
A proton-like composite particle made of Axioms could get a lot heavier! A "Protaxion" might even move sub light speed despite its superluminal parts.
Kevin Reardon
Kevin Reardon - 4 days ago
Dark matter only exists because we are memorized by the three body problem. The Moon and Earth are gravitationally locked, which is the same effect you see with the outer stars of a galaxy. There is no dark matter, there are gravitational rings on the outer reaches of a galaxy.
Exoplanet Research
Exoplanet Research - 4 days ago
There are galaxies with barely any dark matter. They should map the total magnet fields for the galaxies, then compare the dark matter content
Clickmaster5k - 5 days ago
Calling us out. Geez
Roman Buehler
Roman Buehler - 5 days ago
let me nerd away in my own world: that noise... what's that noise?!?!?! in ALL your videos, it's driving me insane and i have to focus hard on what you say...
there's the music in the background, and there's you speaking, but there's also a noise, probably peaking around 600-800hz all over the videos...

is that intentional by the editor to avoid hearing fatigue because of too clean sound? -> better way would be to use light audio compression on the voice track...
is that because your recording environment is so noisy? -> with your budget you really should get better accoustic padding and isolation...
is your editor hearing impaired and he never noticed? -> run some analysis on the sound output, find it and fix it, please!!!
Roman Buehler
Roman Buehler - 5 days ago
it appears to be the mic input... FIX PLEASE!
Net Tech
Net Tech - 5 days ago
Off topic, I know it is mathematically and physically possible to add positive mass to a point of spacetime but I'm curious if it is mathematically possible to add negative mass to a point of spacetime. A blackhole adds mass to a singular point by consuming mass increasing mass and gravity bending spacetime one way but is it mathematically possible to do the opposite creating negative mass effects to bend spacetime the inverse way?
Audacious Scoundrel
Audacious Scoundrel - 5 days ago
17 minutes of man talking to himself in the mirror.
ChefHomesteadMaker - 5 days ago
That Thing That Newton Wrote, is it a must read?
Marcin Zieminski
Marcin Zieminski - 5 days ago
There are 4 fundamental forces, and lots of different particles. How do scientist now which particle interacts with different forces? Ex.axions interact only with gravity and weak force, my question is why they interact only with those two forces, ? What is the mechanism behind it? Are there any laws which tell us that any given particle will interact with any given fundamental force?
Chrizzie 78
Chrizzie 78 - 5 days ago
Does any of this matter?! Thank you, you've been a great audience.
Brad Bradson
Brad Bradson - 5 days ago
Maybe there is no Dark Matter, maybe there is many Dark Matters
Tirlon Burke
Tirlon Burke - 5 days ago
You recently did a show on infinite universes and possibly the infinity of our universe. If either is the case, shouldn’t there be a wormhole we could traverse somewhere accessible on planet just waiting for someone enterprising to push a monkey through into a magnitar and one for us to travel somewhere slightly more pleasant?
Imgay Asheck
Imgay Asheck - 5 days ago
This channel still believed in inflation so I'm going to guess no
Frank Jaeger
Frank Jaeger - 5 days ago
I believe that in Latin the letter "c" is always pronounced as the letter "k". So the second way you pronounced it would be the most correct.
Max Jones
Max Jones - 6 days ago
I love your content Cosmic Jesus.
shipmaster3 - 6 days ago
Do you think that there is some relationship between the photon energy and the strength of a magnetic field needed to convert it? or is it just a sufficiently strong magnetic field is needed to any photon into an axion regardless of energy ?
Cierra Mist
Cierra Mist - 6 days ago
If the spin of a black hole can rip away its event horizon revealing a "naked singularity", would all the mass that's in the singularity come exploding out? Maybe the big bang was an event like this?
Manus Artifex
Manus Artifex - 6 days ago
Anxious dark matter
Sister of Gaia
Sister of Gaia - 6 days ago
If you take the remove the first 5 00000 from the quantum vacuum number measurment of the Universe. It would explode 💥 and we would not be here 📌
weylguy - 6 days ago
Wow - explaining an undetectable form of matter with another undetectable form of matter. Turtles all the way down? But I love this PBS program!
Gareth Dean
Gareth Dean - Day ago
Pretty sure it's been solidly disproved. But hey, flat Earth has made a comeback too.
weylguy - 3 days ago
@Gareth Dean 130 years later, the aether theory is still awaiting confirmation.
Gareth Dean
Gareth Dean - 4 days ago
*Currently* undetectable. The hope being of course that we CAN detect it Nobody's sitting in bed going 'Boy, I hope we find nothing tomorrow!'
mettaur01 - 6 days ago
Is this where all the perverted Globe Earthers hang out?
Scoring digits, son.
Scoring digits, son. - 6 days ago
Maj kohoni? Nahe!
PouncingAnt - 6 days ago
Excellent. Sounds like Axions are an elegant solution to at least two big physics problems. Which leaves the question,
Why might they not be?
Is there anything besides the lack of experimental evidence to justify the title of the video being a question rather than a statement?
(Of course, experimental evidence is a requirement of the scientific method, but.. you know how when they hype a particle, then you go and see the particle, and it's not as good as you were expecting...)
P.S. A lot of people thought that about the Higgs.... But I thought it was a massive success.

P.P.S. Sorry
Amari Reyne
Amari Reyne - 6 days ago
"The universe may be truly spatially infinite"
Even though I already had that idea in my head, hearing the words out loud from someone else really melted my mind.
There's so many things we will never even begin to understand before the heat death of our own part of the whole universe.
I mean, we used to think the milky way was the whole universe. And we were calling Andromeda an "island universe"
What's to make anyone think the universe we observe isn't just one of... Billions? Trillions? Infinite? Universes.
Guess we will never know 🤷‍♂️

I havent slept in 27 hours, go easy on me if you reply 😅
Zenothys - 6 days ago
Amari Reyne You have a healthy skepticism and an inspiring curiosity. No reason to worry about responses imo! To give my two cents, space is only as large as needed to contain all possibilities (which I believe isn't infinite, but does inflate fast enough to redefine infinity to some larger number the instant the previous number is defined), and once you hit the "edge" of space, space becomes _time_ and more or less travels back to the Big Bang via the "beloved" Bogoliubov transformation.
Cheasy - 6 days ago
a nerd channel and no 60 fps xD yr tittle has been revoked
Mtf - 6 days ago
I used to watch these videos and then, frustrated for not being able to understand, go to the pub . Now I 've thought better and I go to the pub BEFORE watching the videos and suddenly they are crystal clear .
Doldol D
Doldol D - 6 days ago
Really interesting episode
frysebox1 - 6 days ago
Me: Officer, why am I being detained?
Officer: 2:18
Lance Tschirhart
Lance Tschirhart - 6 days ago
Great apes _are_ monkeys. Jesus Christ, these cosmologists..
Manu V
Manu V - 6 days ago
Do I come here just to feel dumb!?
Art - 6 days ago
Had to downvote after the first two seconds :(
Bill McDonough
Bill McDonough - 7 days ago
Matt, just to 'nerd all the way': the great apes (or Hominidae) are a Family within the infraorder Simiiformes... the monkeys. So strictly, all apes *are* monkeys. Catarrhini 'Old World' monkeys, in fact.
Gabriel Desmarais
Gabriel Desmarais - 7 days ago
I guess it is official, we can't out-nerd Matt.
Kez - 7 days ago
Can you be straight and wear a pink shirt into a gay bar?
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