Could anyone give me a link where I can find an answer :
is it an attractive or repulsive force?
what is its formula ?
is it an inverse square law or what?
what's its strength?
what produces it?
Thanks a lot
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Could anyone give me a link where I can find an answer :
is it an attractive or repulsive force?
what is its formula ?
is it an inverse square law or what?
what's its strength?
what produces it?
Thanks a lot
Last edited by monalisa; September 26th, 2013 at 02:27 AM.
For posting a recent news article rather than a text book definition.
Correct.
Coulomb's law - Wikipedia, the free encyclopedia
Is what repulsive? The Weak Force?
It depends on the charges involved to determine if there is attraction or repulsion.
Yes.
It is. But it does not follow the inverse square law. I'm sorry... But have you done any reading on the links provided?
Oh, I don't know... But googling revealed this:
How strong is the weak force? New measurement of the muon lifetime
Yup.
Hey bro,
weak "force" isn`t really a good name. I know it`s widely used but it`s not a force in common sense. Weak interaction is better. Some processes of weak interaction are simple scatterings either attractive or repulsive depending on electric charge, some act in different way. There are three force carriers that mediate weak force. That is Z, W+ and W- bosons.
The Z boson is massive vector field without electric charge. In very simplistic way one can think of that as nothing else than massive photon. These act naturaly almost as photons. They mediate things like electron-electron scattering at high energies. Electron flyes close to other electron, they "exchange" Z boson which changes their momenta and they fly further but these work only at very high energies.
The real fun begins with charged vector bosons W+ and W-. These are the ones that govern beta decay among others. Since they are charged they change electric charge of their "emittor" and "recipient". They change flavours of quarks (probabilities of which are given by CKM mixing matrix), they can change lepton (electron, muon, tauon) into its respective neutrino and their decay creates lepton + neutrino pairs. Since they change flavours and part of interaction may be neutrino these are responsible for violating various conservation laws and CP symmetry.
Well thay would be weak force lagrangian but without some serious knowledge of quantum field theory this won`t tell you anything. And it`s long.
Well for scatterings you can get Born amplitude from Feynman diagram and Fourier transformation of that will give you potential in coordinate space but again this won`t tell you anything without some serious knowledge of scattering in quantum mechanics.
That`s interesting question. For decays and such strengh is of course meaningless word but for scatterings it`s not. The thing here is that coupling constant (like electric charge in electromagnetism) is actually dependent on energy of interaction. This is principle known as running coupling constant. That`s as far as I will go with this.
I don`t think I understand your question but weak interaction is mediated by Z, W+ and W- massive vector bosons. Same as electromagnetism has it`s electromagnetic field this interaction has these three fields. Interesting thing is that I read somewhere that weak force actually isn`t necessary (as only one of four forces) for active universe (eg. stars, planets, supernovaes and such). I don`t know where probably wikipedia but interesting thought.
I read most of the quoted links before starting the thread as I did not find any answer, even in this link they give only the lifetime and not the strength.
In a proton or neutron we have both positive and negative quarks, how does weak force interacts with them? how can a force interacts echanging particles?
That is because the concept of "strength" does not really make sense if used in connection with the weak interaction.
All forces are mediated by the exchange of particles - that's one of the core concepts of quantum field theory.how can a force interacts echanging particles?
Thats just result of perturbative expansion of S matrix. Simply convenient formalism. There aren`t photons flying from one electron to other and such just an easy way to imagine and draw (Feynman diagrams) interaction and calculate it`s amplitude without the need for explicit full expansion of S matrix.
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