Kavli Affiliate: Lijing Shao
| First 5 Authors: Haoran Di, Lijing Shao, Zhu Yi, Shi-Bei Kong,
| Summary:
The Hubble constant, $H_0$, is a crucial parameter in cosmology. However,
various cosmic observations have produced differing posterior values for $H_0$,
resulting in what is referred to as the $H_0$ tension. To resolve this
discrepancy, utilizing other cosmological probes to constrain $H_0$ 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 $f_alesssim10^{13}{rm{GeV}}$, with the frequency depending on
the axion mass and the luminosity determined by both the axion mass and decay
constant. Therefore, we propose that collapsing axion stars could serve as a
novel standard candle to constrain $H_0$. Even more interesting is that the
radio bursts emitted by collapsing axion stars with specific parameters match
the characteristics of observed non-repeating fast radio bursts (FRBs). Thus,
FRBs generated by collapsing axion stars have the potential to be used as
standard candles to constrain $H_0$.
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