Pulsar timing signal from ultralight axion in $f(R)$ theory

Abstract

An ultralight axion around $10^{-23}$ eV is known as a viable dark matter candidate. A distinguished feature of such a dark matter is the oscillating pressure which produces the oscillation of the gravitational potential with frequency in the nano-Hz range. Recently, Khmelnitsky and Rubakov pointed out that this time dependent potential induces the pulse arrival residual and could be observed by the Square Kilometre Array (SKA) experiment. In this paper, we study the detectability of the oscillating pressure of the axion in the framework of $f(R)$ theory, and show that the amplitude of the gravitational potential can be enhanced or suppressed compared to that in Einstein's theory depending on the parameters of the $f(R)$ model and mass of the axion. In particular, we investigate the Hu-Sawicki model and find the condition that the Hu-Sawicki model is excluded.

arXiv comment5 pages, 2 figures

References in corpus (8)

• f(R) theories
• Cold and Fuzzy Dark Matter
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Chameleon Cosmology
• Axions In String Theory
• Disappearing cosmological constant in f(R) gravity
• Cosmic Structure as the Quantum Interference of a Coherent Dark Wave
• Pulsar timing signal from ultralight scalar dark matter

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• Ultralight Dark Matter Statistics for Pulsar Timing Detection
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