My German is pretty good but I know very little of the terminology in Quantum Mechanics.
In Quantum Mechanics one often say something like
the momentum operator p acts on the ket |ψ>.
How would you say that in German?
In most cases in physics, act on sth. is translated by auf etw. wirken. So the phrase is:
Der Impulsoperator p wirkt auf das Ket |ψ>.
For example, in this Wikipedia article you can read:
In der Impulsdarstellung wirkt der Impulsoperator multiplikativ auf Impulswellenfunktionen [...].
Another possible construction I can think of is auf etw. angewandt/angewendet werden:
Der Impulsoperator p wird auf das Ket |ψ> angewandt/angewendet.
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Sometimes also auf den Ket-Vektor. At least, we often said that alongside with das Ket in my QC course. – Jan May 10 '15 at 19:21
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2@CarstenSchultz It is actually a group action (by one of the generators of the Poincaré group). But my German is not enough to say that it's because of that, that one uses wirken. – c.p. May 11 '15 at 14:13
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Act on for group actions is actually auf etwas operieren. I have never heard auf etwas wirken in mathematics. If that's really what they say in physics for a group action, then that would mean that terminology has diverged between the two fields. – user2183 Oct 20 '15 at 22:28
