/edu/ - Education

Do you mean "colour revolution"? It is just a fancy name. Some of the events were named after colours but it is not a rule, see a list here: https://en.wikipedia.org/wiki/Colour_revolution#List_of_colour_revolutions

>>6944
I know this is late but OP is actually talking about quantum chromodynamics
https://en.wikipedia.org/wiki/Quantum_chromodynamics
https://en.wikipedia.org/wiki/Color_charge

I'm not a physicist and i don't know shit about quantum mechanics but here's how i understand it:
The color charge is just like electrical charge in the sense that it causes objects to attract or repel
The electrical charge can have 2 types which is either positive or negative and its rules are very simple: opposite charges attract and like charges repel
The color charge can have 6 different types instead of the just 2 types (positive and negative) of electrical charge which is why is it's so damn complicated.
The reason why it's called color charge is simply an analogy to how these charges combine in a similar way to colors(see below) and has nothing to do with the actual color of the particles, remember that what we call a 'color charge' is just some property which causes particles to feel a force, because there are 6 types of color charge the rules for whether this force is an attractive or a repelling force is much more complicated.

The possible types of color charges are: Red, Green, Blue, Anti-red, Anti-green, Anti-blue
Note that Anti-red, Anti-green, Anti-blue are also called Cyan, Purple and Yellow respectively, see pic 1 and 2.
Now what are the rules for color charges? which charges attract which and which repel which?
When you combine a positively charged particle(such as a proton) with a negatively charged particle(such as an electron) you get a neutral structure(such as a hydrogen atom), effectively the positive and negative charges cancel each other, However the color charge doesn't work like that, when two color charges mix they give rise to a different color charge which is why they're compared to how color mix, here's how some of the different charges mix:
>Red+Green = Anti-blue (Yellow)
>Red+Blue = Anti-green (Purple)
>Green+Blue = Anti-red (Cyan)
>Anti-red + Anti-green = Blue
>Anti-red + Anti-blue = Green
>Anti-green + Anti-blue = Red
>Anti-red + red = No charge
>Anti-green + green = No charge
>Anti-blue + blue = No charge

The rule for attraction is as follow: a particle with a color charge is attracted to its complement color charge or any combination of color charges that produce its complement color charge.
So for example, a particle with a color charge of red would be attracted to a particle with a color charge of anti-red or it could be attracted to two particle with green and blue charges since green+blue=anti-red, See pic 3 for illustration.

Again i'm not a physicist so my understanding might be incorrect or inaccurate.

>>6990

Your understanding is correct, but I would stress that the main phenomenological law behind color charges is the fact that any "complete" particle composed of quarks we see is colourless (or white) - so for example a baryon (such as a proton or a neutron) which consists of three quarks one is red, one is blue and one is green - the sum of the colours is white. For a meson it must be colour + anti-colour.

It's very important to understand that free colour charges have NEVER been observed, it's not just attractive/repulsive.