Dynamical dark energy from an ultralight axion
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913902909980672 |
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| author | Luu, Hoang Nhan Qiu, Yu-Cheng Tye, S. -H. Henry |
| author_facet | Luu, Hoang Nhan Qiu, Yu-Cheng Tye, S. -H. Henry |
| contents | Recently the Dark Energy Survey (DES) Collaboration presented evidence that the equation of state $w$ of the dark energy is varying, or $w \simeq -0.948$ if it is constant. In either case, the dark energy cannot be due to a cosmological constant alone. Here we study an ultralight axion (or axion-like particle) with mass $m_ϕ\simeq 2 \times 10^{-33}$ eV that has properties that can explain the new $w$ measurement. In particular, $w\ge -1$ and a negative cosmological constant $Λ< 0$ is preferred in this model. We also present a simple formula for $w$ for the model to ease data fitting. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_18120 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamical dark energy from an ultralight axion Luu, Hoang Nhan Qiu, Yu-Cheng Tye, S. -H. Henry High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Recently the Dark Energy Survey (DES) Collaboration presented evidence that the equation of state $w$ of the dark energy is varying, or $w \simeq -0.948$ if it is constant. In either case, the dark energy cannot be due to a cosmological constant alone. Here we study an ultralight axion (or axion-like particle) with mass $m_ϕ\simeq 2 \times 10^{-33}$ eV that has properties that can explain the new $w$ measurement. In particular, $w\ge -1$ and a negative cosmological constant $Λ< 0$ is preferred in this model. We also present a simple formula for $w$ for the model to ease data fitting. |
| title | Dynamical dark energy from an ultralight axion |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.18120 |