Abstract
The modifications of plasmonlike excitations in hot hadronic or quark-gluon matter due to the finite size of the systems that will be produced in relativistic heavy-ion collisions are investigated. It is shown that the relevant parameter is {ital RM}{sup 2}/{vert bar}{bold q}{vert bar} where {ital R} is the size of the system, {ital M} is the mass of the plasmon in an infinite system, and {bold q} is its three-momentum in the plasmon. If {ital RM}{sup 2}/{vert bar}{bold q}{vert bar}{much lt}1, the plasmon excitations will not be produced. This has important implications for plasmons generated in heavy-ion collisions by electromagnetic interactions which have been suggested by some authors.
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