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I'm currently reading the book "Quantum Field Theory for Mathematicians" by Ticciati and in section 2.3 he mentions that the Lorentz action on the free scalar field creation operators

[itex] \alpha(k)^\dagger [/itex] is given by

[tex] U(\Lambda)\alpha(k)^\dagger U(\Lambda)^\dagger =

\alpha(\Lambda k)^\dagger .[/tex]

Can someone tell me how to show this, or at least how to get started?