Novel standard candle: Collapsing axion stars
Haoran Di, Lijing Shao, Zhu Yi, and Shi-Bei Kong

TL;DR
This paper proposes collapsing axion stars as a new standard candle for cosmology, linking their radio burst signals to fast radio bursts and using them to measure the Hubble constant.
Contribution
It introduces the novel idea that collapsing axion stars can serve as standard candles, providing a new method to constrain the Hubble constant using observed fast radio bursts.
Findings
Collapsing axion stars produce radio bursts matching observed FRBs.
Radio bursts depend on axion mass and decay constant.
Potential to use FRBs as standard candles for cosmological measurements.
Abstract
The Hubble constant, , is a crucial parameter in cosmology. However, various cosmic observations have produced differing posterior values for , resulting in what is referred to as the tension. To resolve this discrepancy, utilizing other cosmological probes to constrain is advantageous. In the quest to identify dark matter candidates, the QCD axion and axionlike particles, collectively referred to as axions, have become leading contenders. These elusive particles can coalesce into dense structures known as axion stars via Bose-Einstein condensation. When these axion stars exceed a critical mass, typically through accretion or merging, they experience a self-induced collapse. This process results in short radio bursts, assuming a decay constant , with the frequency depending on the axion mass and the luminosity determined by both the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · History and Developments in Astronomy · Astronomy and Astrophysical Research
