| 21. | In technical terms, gluons are electromagnetic interaction but lacks an electric charge.
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| 22. | These include glueballs and hybrid mesons ( mesons bound by excited gluons ).
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| 23. | Superfluids ( like Fermionic condensate ) and the quark gluon plasma are examples.
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| 24. | Quark gluon plasma was discovered at CERN in 2000.
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| 25. | However, the gluon only holds together quarks that are three different colors.
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| 26. | This energy derives from the strong interaction, which is mediated by gluons.
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| 27. | QCD is a SU ( 3 ) gauge theory involving gluons and quarks.
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| 28. | This phase is also called the quark gluon plasma.
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| 29. | Hence free color charge and free gluons cannot exist.
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| 30. | Other vibrational modes of open strings exhibit the properties of photons and gluons.
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