Geologic time is simply time used in the context of earth history, determined by geologic methods. Our only record of the passage of geologic time lies in the Earth's rock strata. This record is imperfect, but it is our only one.
the adoption of opinions
But what if carrying sail capsize the boat?
In Chaps. 3, 4, and 5, we saw that for each spin type, the Schrödinger picture wave equation for a state and the Heisenberg picture wave equation for the associated quantum field had the same form. In the former case, the wave equation solution was a state, i.e., a particle wave function. In the latter, the wave equation solution was a quantum field, i.e., an operator that created and destroyed states. For free scalars, this equation was the Klein-Gordon equation; for spinors, it was the (no interactions) Dirac equation; and for massless vectors (photons), it was Maxwell’s equation (sourceless, in terms of A𝜇).
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