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dev70
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Hi pf, i have been wondering what differentiates QED Vacuum from QCD Vacuum? How would u explain its implications? I mean, how can u define pure vacuum in 2 ways?
The difference is, QED vacuum contains no electrons, while QCD vacuum contains no quarks.dev70 said:Hi pf, i have been wondering what differentiates QED Vacuum from QCD Vacuum?
Ok then, if it is not zero, what is its value?tom.stoer said:##\langle N_s \rangle_\text{vac} = \langle\text{vac} | N_s | \text{vac}\rangle \neq 0##
I was cheating a little bit b/c one does not determine <N> but the (flavor-specific) quark condensate; afaik the (ren.-scheme dep.) values are in the range of 300 MeV3; afaik in two-flavor QCD the value can be related to the pion mass and decay constant via the Gell-Mann–Oakes–Renner relation, e.g. in current algebra and chiral perturbation theory; there should be lattice gauge calculations as well.Bill_K said:Ok then, if it is not zero, what is its value?
QED (Quantum Electrodynamics) vacuum refers to the vacuum state in which the electromagnetic field has no particles or fluctuations. QCD (Quantum Chromodynamics) vacuum refers to the vacuum state in which the strong nuclear force has no particles or fluctuations.
The main difference between QED vacuum and QCD vacuum is the type of force they represent. QED vacuum is associated with the electromagnetic force, while QCD vacuum is associated with the strong nuclear force.
QED vacuum and QCD vacuum have different effects on the behavior of particles. QED vacuum allows for the creation and annihilation of virtual particles, while QCD vacuum is responsible for the confinement of quarks and gluons within particles.
Yes, QED and QCD vacuum can coexist and interact with each other. In fact, QED vacuum plays a role in the formation and stability of hadrons, which are particles that are bound by the strong nuclear force.
The study of QED and QCD vacuum has greatly contributed to our understanding of the fundamental forces and particles in the universe. It has also helped explain the behavior of particles and the structure of matter. Additionally, QCD vacuum plays a crucial role in the theory of the strong nuclear force, which is essential for understanding the behavior of protons and neutrons in atoms.