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Oscillating gravitational potential due to ultralight axion: Linear theory

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Title
Oscillating gravitational potential due to ultralight axion: Linear theory
Author(s)
Jai-chan Hwang; Hyerim Noh
Publication Date
2022-09
Journal
PHYSICS OF THE DARK UNIVERSE, v.37
Publisher
ELSEVIER
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. Both the quantum stress in density perturbation and the quantum oscillation of the gravitational potential are derived in the zero-shear gauge. By comparing the density, velocity and potential perturbation equations, 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. Relativistic perturbation analyses are made in the zero-shear gauge. (C) 2022 Elsevier B.V. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/12338
DOI
10.1016/j.dark.2022.101108
ISSN
2212-6864
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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