The Use of Group Theory in Particle Physics

I made this video when I was 13 so many things I say are likely wrong. Nothing in this video should be taken seriously, and I'm only keeping it up for sentimental value.

[peterhunt]

This is the very best video I have come across for this topic. I have been trying to make sense of the connection between groups and particles and finally after 15 years of study I am beginning to understand it better. Thanks 🙏

[helloimwill]

Damn that was good. Great presentation with notes about avoiding the stigma of a property name, and grouping things in general and then grouping symmetries. You kick ass.

[omgj]

you should make a series on particle physics

[michaelgonzalez]

The particles are a minute
Portion of physical elemental of the known by
You

[michaelgonzalez]

That is why a dragon fly
Is the cube and spheres
Are it'shydrolics power

[marcusrosales]

For anyone who wants to learn more I'd recommend: Greiner's quantum mechanics symmetries.

There are quite a few errors, but there is a free pdf online and it introduces concepts as if you have never seen them. Really cleared up how representations can be used in physics and how Casmir operators form a Hamilton belonging to a specific symmetry group.

[johnsolo]

The last sentence is a lot deeper than people realize. Great job ending it on that.

[mehdinategh]

very clear and understandable talk, I enjoyed it.

[michaelgonzalez]

Using slow motion can map all particals

[dimplemonsterakadimplemonb]

Dayum!! boy... u r a saviour! Please make more..

[sanidhyasinha]

very clear. Please explain other symmetries in Particle Physics like Isospin symmetry .

[nliehugtil]

Nice video, but it starts to break down around the 6:00 mark. POV: I'm not a physicist; I know what groups are but idk how quarks act like. The explanation at 6:00 ("SU(3) is very similar to the symmetry of the group of 3 chairs") made me think SU(3) was the physicist's notation of the symmetric group of 3 elements. Then I was super confused when the claim that SU(3) on mesons (2 quarks) produced 8 configurations, and the group acting on baryons (3 quarks) produced 8 configurations as well. I also never got to know if a baryon is necessarily "2 quarks of flavour A, and 1 quark of flavour B", and if so, does a meson's 2 quarks necessarily be of different flavours as well?

[charliewilson]

Thanks this may help me conceptualize my star trek food replicator yet! Let alone the transporter. So if i need to use the 4th dimension is groupsu4 practical?

[infiniteloops]

8:40 That was a good lecture thanks, but physics certainly is not math. Not even close. Math is just a tool, to explore the ideas, physics is the reality of the universe. Surely, w/o math physics may not go that far. However, just because there is one solution and mathematics say it is valid, it doesn't mean the universe and the physics agrees with that solution.

[enjillajan]

Nice presentation, but why the cube has only 24 symmetries and how the sphere has infinite number of symmetries?

[shideshpatil]

Awesome representation dude love from india.🙏🙏

[peterhunt]

I have been looking for an explanation like this for ages. My next question is how then exactly is the maths done - lol 😂But seriously how does the langrangian for a particular field theory, say QED for example - how does the langrangian connect or relate mathematically to the symmetry group?

[samapanbhadury]

nice presentation. simple and educative.

[veronicanoordzee]

PHYSICS tries to give an description of their part of the universe (apart from chemistry, biology, etc.). MATH (and language and graphs) has always been used to describe this physical part of NATURE. Only the kind of math that is used has changed over time, in going from the description of macroscopic objects to subatomic objects.

[davidhand]

this is wrong. SU(3) is not between flavours. Those are SU(2) and involve the W and Z bosons. SU(3) is the symmetry of "color"; SU(3) particles have a charge of "red", "green", "blue" or their anti-colors. The 8 generators of the group correspond to the 8 types of gluon, the SU(3) force carrying particle. This was a pretty good book report or whatever, but you need to make it clear that this is not an authoritative source by a PhD physicist.