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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2111.07502 (astro-ph)
[Submitted on 15 Nov 2021 (v1), last revised 7 Dec 2021 (this version, v2)]

Title:Oscillating gravitational potential due to ultralight axion: linear theory

Authors:Jai-chan Hwang, Hyerim Noh
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Abstract:We derive oscillating gravitational potential caused by an ultralight axion as the cosmic dark matter, assuming the Compton wavelength smaller than the horizon scale. A new oscillatory term is found which dominates the previously known one on scales larger than the quantum Jeans-scale. In the context of linear perturbations in cosmology this new term might be more relevant in future observation. Both the quantum stress in density perturbation and the quantum oscillation of the gravitational potential are derived in the zero-shear gauge. We show that the axion fluid in relativistic analysis is quite different from the relativistic and Newtonian zero-pressure fluids, corresponding to Newtonian fluid only in the density perturbation. The consistency demands the relativistic analysis valid on scales larger than the Compton wavelength.
Comments: 6 pages, no figure, substantial revisions made, including title
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Cite as: arXiv:2111.07502 [astro-ph.CO]
  (or arXiv:2111.07502v2 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2111.07502

Submission history

From: Hyerim Noh [view email]
[v1] Mon, 15 Nov 2021 02:37:42 UTC (11 KB)
[v2] Tue, 7 Dec 2021 07:46:06 UTC (11 KB)
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