Entropy production in a longitudinally expanding Yang–Mills field with use of the Husimi function: semiclassical approximation

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our study agrees with the von Neumann entropy in the high-temperature and weak-coupling

limit.

Next, we show that the HW entropy defined by Eq. (20) takes the minimum value 1 for the

perturbative vacuum state as

= 1.

(D7)

SHW ({ω}) ≥ SHW ({ω})

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