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We consider N>>1 accelerating (i.e., oscillating) photodetectors modeled as two level systems (TLSs) that are contained within a microwave cavity and show that the resulting photon production from vacuum can be collectively enhanced such as to be measurable. The cavity-accelerating TLSs system maps onto a parametrically driven Dicke-type model and when the detector number N exceeds a certain critical value, the vacuum photon production undergoes a phase transition from a normal phase to andoi:10.21203/rs.3.rs-135207/v1 fatcat:pghk2glvp5bvhhpt7tfafq4d5m