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Article overview
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Pulsar Timing Array Signature from Oscillating Metric Perturbations due to Ultra-light Axion | | Jai-chan Hwang
; Donghui Jeong
; Hyerim Noh
; Clemente Smarra
; | | Date: |
1 Nov 2023 | | Abstract: | A coherently oscillating ultra-light axion can behave as dark matter. In
particular, its coherently oscillating pressure perturbations can source an
oscillating scalar metric perturbation, with a characteristic oscillation
frequency which is twice the axion Compton frequency. A candidate in the mass
range $10^{(-24,-21)}{
m eV}$ can provide a signal in the frequency range
tested by current and future Pulsar Timing Array (PTA) programs. Involving the
pressure perturbations in a highly nonlinear environment, such an analysis
demands a relativistic and nonlinear treatment. Here, we provide a rigorous
derivation of the effect assuming weak gravity and slow-motion limit of
Einstein’s gravity in zero-shear gauge and show that dark matter’s velocity
potential determines the oscillation phase and frequency change. A
monochromatic PTA signal correlated with the velocity field would confirm the
prediction, for example, by cross-correlating the PTA results with the future
local velocity flow measurements. | | Source: | arXiv, 2311.00234 | | Services: | Forum | Review | PDF | Favorites | |
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