Physical Interpretation
Scalar fields are often interpreted as classical approximations, in the sense of effective field theory, to some quantum field. In general relativity, the speculative quintessence field can appear as a scalar field. For example, a flux of neutral pions can in principle be modeled as a minimally coupled massless scalar field.
Read more about this topic: Scalar Field Solution
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—Elizabeth Stuart Phelps (1844–1911)