Ethan Siegel | Demystifying Dark Matter | The Cartesian Cafe with Timothy Nguyen

Ethan no Aircule poirow yeaa😊. Those leeteel grey cells..

So long as he's getting enough vitamin D , it's all good

Love these videos thank you for curating!

Thats easy. It does not exist and is merely an accomodation until we figure "the truth" out.

Amazing podcast, thanks!

This is truly amazing ! Thank you very much !
Mr Siegel is doing an awesome job at explaining science to non scientific people

Unfortunately Planck mass black holes have an effectively zero scattering cross-section!

Possibly the most preposterous facial hair I've ever seen. Clown world.

Dark matter is bullshit, it's a made up bullshit theory, if you can even call it a theory at all, because the 'modern' brain washed sciencetard's aren't allowed to tell you about the 'Aether' as that would lead people on to the 'rediscovery' of God! And we can't have that can we? Just saying....it's total BS made up because they can't make their BS equations work, just like gauge symmetries in physics are their to hide the infinite energy of things which just keep on vibrating forever, just like the cosmic AUM funnily enough! Have a fun day! ;D
NB - Space is bullshit as well.....just trying to help.....😁

Since Ethan didn’t give a proper steel-manning of MOND and the bullet cluster problem, I would like to give my understanding of Milgrom’s MOND response. After all, the question I submitted to Brian Keating about the bullet cluster was asked by Brian in his interview of Milgrom.

Milgrom said that non-colliding galaxy clusters have always and admittedly been a problem for MOND. MOND works for galaxy rotation curves and when scaled up to clusters, MOND eliminates the need for much of the DM. However, there is still missing mass in the clusters (a factor of ~2, whereas lambda CDM requires a factor of ~5 DM to normal matter). Milgrom supposes that there is some unexplained/unknown baryonic matter in galaxy clusters.

Milgrom says this unknown baryonic matter in clusters (that MOND has always assumed is missing) continues its travel with the galaxies in the cluster (i.e. it is not slowed by some kind of self-interaction the way the gas is slowed as shown by the x-rays). So in Milgrom’s view, it is this unknown baryonic matter that explains why we see that most of the mass/gravity in the bullet clusters is with the galaxies and not the gas. Milgrom’s response seems reasonable to me, and I think Ethan should respond to this explanation instead of saying the Modified Gravity community “say things [about the bullet cluster problem], but those things don’t address this point” because Milgrom clearly understands and addresses the point.

As an aside, Sabine Hossenfelder repeatedly says that the bullet cluster is a huge problem for both MOND and lambda CDM (possibly an equivalent problem though I don’t want to speak for her). Since Tim Nguyen has connections to Sabine and Ethan, it would be awesome if you could have them both on for a short discussion. I think a lot of people would be really interested. Curt Jaimungal does a good job of hosting these types of discussions and frames them as theolocutions instead of debates, which I think is helpful.

Great talk. Ethan is a great scientific communicator. Thank you both.

Sería genial que estubieran subtitulados en español

This channel will be exploded in few months....Really such a high quality content I ever seen

These interviews are excellent. Great encountering this caliber of discussion. Admiration from a fellow data scientist here Tim 👍🏽

Try CIG Theory as an explanation of Dark Matter. May solve it and the Measurement Problem as well, and more.

Super hyped that Ethan will be making videos regularly. I've been following him for years, and if Sabine Hossenfelder has taught us anything, there's a huge appetite for this kind of stuff!

Dark matter and energy sound like cosmological phlogiston. Can any testable predictions be derived from the idea?

What is going on here?

Your handwriting and drawings are equivalent to letting a seahorse on meth grip a crayon and go to town.

I subscribe to his column and podcast on Medium. While I enjoy Neil De Grasse Tyson, Dr. Siegal's writings are probably the best out there for the layperson because he forces you to think and know about basic concepts of physics, which are necessary to understand the topic matter. Great to see him here.

Uncle fester should have his medication checked.

TLDR it's a theory because we can't balance our current theory to observations.

In the bullet cluster frames, red is where the mass is, blue is where the gravitation is. Don't fall into the trap Einstein did with his greatest blunder. Gravitation in the absence of mass is the tale dark matter tells.

Gas=ready to burn?
Dust=already burnt?

I have followed Ethan on his podcast but your channel is interrupted by so fascist kleptocratic scam advertisers ads that is just too much stupidity and to nescience that it is too much trouble to deal with

Loved this discussion, learned a lot! But to counter Ethan’s point near end, we can’t afford to do every possible experiment covering every possibility. The country is already bankrupt, this would throw in the towel. Therefore, we need to be very judicious with the selection of our experiments looking for justifications as to which have higher probability of providing a most useful result. And towards that end, the theorists still need to be out in front because on average theory is much cheaper than experiment.

Would love to see more of Ethan Siegel.

If cost were not a factor, then you would want to do all experiments possible. But some of the experiments take a large portion of available funding at the expense of other possible experiments. You need to have some way to decide how to allocate scarce resources.

I wish Eric would do this with you. That would be huge. Can’t we all just get along. ? Maybe DM each other.

Damn Ethan’s ability to write and draw are almost as bad a my own. I’m almost encouraged that I’m not the only one.

Core-cusp tension sets a limit on cross-section under some assumptions about dark matter.

I subscribed, the fundamental phenomenon of dilation perfectly explains galaxy rotation curves/dark matter. Mass that is dilated is smeared through spacetime relative to an outside observer. It's the phenomenon behind the phrase "mass becomes infinite at the speed of light". A graph illustrates its squared nature, dilation increases at an exponential rate the closer you get to the speed of light. A time dilation graph illustrates the same phenomenon, it's not just time that gets dilated.
Dilation will occur wherever there is an astronomical quantity of mass because high mass means high momentum. This includes the centers of very high mass stars and the overwhelming majority of galaxy centers.
The mass at the center of our own galaxy is dilated. This means that there is no valid XYZ coordinate we can attribute to it, you can't point your finger at something that is smeared through spacetime. More precisely, everywhere you point is equally valid. In other words that mass is all around us.
Dilation does not occur in galaxies with low mass centers because they do not have enough mass to achieve relativistic velocities. It has recently been confirmed in 6 very low mass galaxies including NGC 1052-DF2 and DF4 to have no dark matter. In other words they have normal rotation rates. All binary stars have normal rotation rates for the same reason.