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Pulsar Timing Array Signature from Oscillating Metric Perturbations due to Ultra-light Axion
Jai-chan Hwang, Donghui Jeong, Hyerim Noh +1
A coherently oscillating ultra-light axion can behave as dark matter. In particular, its coherently oscillating pressure perturbations can source an oscillating scalar metric pertu…
On graviton-photon conversions in magnetic environments
Jai-chan Hwang, Hyerim Noh
Graviton-photon conversions in a given external electric or magnetic field, known as the Gertsenshtein mechanism, are usually treated using the four-potential for photons. In terms…
Maxwell equations in curved spacetime
Jai-chan Hwang, Hyerim Noh
In curved spacetime, Maxwell's equations can be expressed in forms valid in Minkowski background, with the effect of the metric (gravity) appearing as effective polarizations and m…
Definition of electric and magnetic fields in curved spacetime
Jai-chan Hwang, Hyerim Noh
Defining the electric and magnetic field vectors in curved spacetime requires a proper choice of the observer's frame four-vector. Related literature shows that this fundamental is…