The most sensitive haloscopes that search for axion dark matter through the
    two photon electromagnetic anomaly, convert axions into photons through the
    mixing of axions with a large DC magnetic field. In this work we apply Poynting
    theorem to the resulting axion modified electrodynamics and identify two
    possible Poynting vectors, one similar to the Abraham Poynting vector and the
    other to the Minkowski Poynting vector in electrodynamics. The latter picks up
    the extra non-conservative terms while the former does not. To understand the
    source of energy conversion and power flow in the detection systems, we apply
    the two Poynting theorems to axion modified electrodynamics, for both the
    resonant cavity and broadband low-mass axion detectors. We show that both
    Poynting theorems give the same sensitivity for a resonant cavity axion
    haloscope, but predict markedly different sensitivity for a low-mass broadband
    capacitive haloscope. Hence we ask the question, can understanding which one is
    the correct one for axion dark matter detection, be considered under the
    framework of the Abraham-Minkowski controversy? In reality, this should be
    confirmed by experiment when the axion is detected. However, many
    electrodynamic experiments have ruled in favour of the Minkowski Poynting
    vector when considering the canonical momentum in dielectric media. In light of
    this, we show that the axion modified Minkowski Poynting vector should indeed
    be taken seriously for sensitivity calculation for low-mass axion haloscope
    detectors in the quasi static limit, and predict orders of magnitude better
    sensitivity than the Abraham Poynting vector equivalent.

    Source link


    Leave A Reply