Modified Gravity Strikes Back

Most astrophysics are pretty convinced that 80% of the matter in the universe is some invisible stuff that they can’t detect - dark matter. The idea has become more popular recently modified gravity ran into trouble by making a wrong prediction about wide binaries. However, in a new paper, John Moffat showed that at least one version of modified gravity -- called MOG -- fits the data just fine. Let’s have a look.

🔗 Join this channel to get access to perks ➜

#science #sciencenews #physics #astrophysics

[jaredmuirhead]

A video on the different theories of modified gravity (MOND, MOG, AeST, Oppenheim, etc.) could be informative. Describing what each looks like mathematically/physically and what each gets right or wrong about observational data.

[TheHiddenMarty]

"getting mogged" now has a compeletly new meaning lmao

[davidva]

In the movie “Spaceballs”, John Candy’s character was from a race called Mog(half man-half dog). He was his own best friend.

[RichardTasgal]

John Moffat taught the course in gravity that I took at U. of T. I liked him as a teacher and liked the subject, though not enough to go into the field. Nice to see him pop up here.

[charlievane]

imagine aliens scared of us when they pick up among our broadcasts mentions of Modified Gravity Wars

[ConnorisseurYT]

I never thought I'd live to see the day Sabine mews and mogs on camera

[sluggo]

When Sabina is in her 90s will she still be saying, "Dark matter, if it exists, which it may not."

[Killer_Kovacs]

It's the gremlins, they modify gravity when you aren't looking and change it back when you are looking

[NoNTrvaL]

I guess you could say that MOND got MOGged... This has to be the cringiest comment I have ever made.

[lexer_]

This explanation of Mog sounded really strange. It comes across like we just formalize the observations using math. Not like it provides some deeper insight beyond an additional set of rules we just follow and then the math works. I would really like a deeper explanation of how this theory goes beyond just formalizing additional rules.

[carlbrenninkmeijer]

Dear Sabine, Shakespeare also a favorite wrote: I don't pick my wisdom from the Stars, but I think I understand Astronomy.. Sonnet Number 14

[tychoides]

The main issue I have with relativistic modified gravity is that they tend to add fields, at which point is not different to dark matter, only that MOND fields are free parameters and dark matter can in principle being detected, although with great difficulty. I should add that the main allure of dark matter comes from the idea that there should be relic particles from when the Universe have a phase transition when initial symmetries were broken. This is still the case as Higg boson detection confirms the electroweak unification. The only issue of dark matter is when people say is fact, when is just a working model that needs further experiments, which is ok.

[carlbrenninkmeijer]

This is really exciting for me, because I remotely understand what it is about. And, I allways liked Astronomy !

[drbachimanchi]

First...second time.somehow your video release is exactly coinciding with my break time.

[Thomas-gk]

Wow, excellent! Dramatic like a thriller, how it flips forward and backward. Good to have someone who keeps us up to date!

[buzzz]

Moffat has written several books for the general public. I recommend Reinventing Gravity. You don’t have to be a professional physicist to understand it. Also Einstein Wrote Back - My Life in Physics about his encounters with legendary physicists. For a good read about the Higgs check out Cracking the Particle Code of the Universe: The Hunt for the Higgs Boson.
P.s. Moffat is 91 and still publishing impressive stuff like this most recent paper.

[LostSoulsLostChurch]

According to wikipedia, MOG can't account for the Bullet Cluster. Ethan Siegel is referred to. Sabine Hossenfelder, on the other hand, says MOG deals just fine with the Bullet Cluster. Should the wikipedia article on MOG be supplemented or corrected?

[johnkeck]

It's always entertaining to see the discontinuity of hairstyle between the body of the video and the ad at the end. Lol

[BooleanDisorder]

As Tuvok's* actor once said: "We ain't found shit"

From Star Trek Voyager*

[vast]

If gravity has a speed limit, an object is basically pulled by another object where it was in the past (possibly a long time ago). Thats pretty important when we talk about thousands of lightyears in distance. How come this is not part of MOND in the first place?