تقرير
Pulsar Timing Array Signature from Oscillating Metric Perturbations due to Ultra-light Axion
| العنوان: | Pulsar Timing Array Signature from Oscillating Metric Perturbations due to Ultra-light Axion |
|---|---|
| المؤلفون: | Hwang, Jai-chan, Jeong, Donghui, Noh, Hyerim, Smarra, Clemente |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology |
| الوصف: | 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 $10^{(-24,-21)}{\rm eV}$ 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. Comment: 8 pages, no figure |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2311.00234 |
| رقم الأكسشن: | edsarx.2311.00234 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |