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We revisit earlier studies on Berry phases suggested to appear in certaincavity QED settings. It has been especially argued that a non-trivial geometricphase is achievable even in the situation of no cavity photons. We, however,show that such results hinge on imposing the {\it rotating wave approximation}(RWA), while without the RWA no Berry phases occur in these schemes. Ageometrical interpretation of our results is obtained by introducingsemi-classical energy surfaces which in a simple way brings out the phase spacedynamics. With the RWA, a conical intersection between the surfaces emerges andencircling it gives rise to the Berry phase. Without the RWA, the conicalintersection is absent and therefore the Berry phase vanishes. It is believedthat this is a first example showing how the application of the RWA in theJaynes-Cummings model may lead to false conclusions, regardless mutualstrengths between the system parameters.

Absence of Vacuum Induced Berry Phases without the Rotating Wave Approximation in Cavity QED