# Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes

@inproceedings{Chen2021CosmologyOT, title={Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes}, author={Zhe Chen and Archil B. Kobakhidze and Ciaran A. J. O’Hare and Zachary S. C. Picker and Giovanni Pierobon}, year={2021} }

Zhe Chen,1, ∗ Archil Kobakhidze,1, † Ciaran A. J. O’Hare,2, ‡ Zachary S. C. Picker,2, § and Giovanni Pierobon3, ¶ Sydney Consortium for Particle Physics and Cosmology, School of Physics, The University of Sydney, NSW 2006, Australia School of Physics, The University of Sydney and ARC Centre of Excellence for Dark Matter Particle Physics, NSW 2006, Australia School of Physics, The University of New South Wales, Sydney NSW 2052, Australia

## 3 Citations

Phenomenology of the companion-axion model: photon couplings

- Physics
- 2021

Zhe Chen,1, ∗ Archil Kobakhidze,1, † Ciaran A. J. O’Hare,2, ‡ Zachary S. C. Picker,2, § and Giovanni Pierobon3, ¶ Sydney Consortium for Particle Physics and Cosmology, School of Physics, The…

Simulations of axion-like particles in the post-inflationary scenario

- Physics
- 2021

Ciaran A. J. O’Hare,1 Giovanni Pierobon,2, a Javier Redondo,3, 4 and Yvonne Y. Y. Wong2 School of Physics, The University of Sydney, and ARC Centre of Excellence for Dark Matter Particle Physics, NSW…

Pulsar Timing Residual induced by Wideband Ultralight Dark Matter with Spin 0, 1, 2

- Physics
- 2021

Sichun Sun1,∗ Xing-Yu Yang2,3,† and Yun-Long Zhang4,5,6‡ School of Physics, Beijing Institute of Technology, Haidian District, Beijing 100081, China CAS Key Laboratory of Theoretical Physics,…

## References

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Phenomenology of the companion-axion model: photon couplings

- Physics
- 2021

Zhe Chen,1, ∗ Archil Kobakhidze,1, † Ciaran A. J. O’Hare,2, ‡ Zachary S. C. Picker,2, § and Giovanni Pierobon3, ¶ Sydney Consortium for Particle Physics and Cosmology, School of Physics, The…

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A mechanism to generate primordial black holes (PBHs) that is independent of cosmological inflation and occurs slightly below the QCD phase transition and is naturally realized in QCD axion models with domain wall number N_{DW}>1 and Peccei-Quinn symmetry broken after inflation.

Gravitational waves from axionlike particle cosmic string-wall networks

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Axion-like particles (ALPs) are a compelling candidate for dark matter (DM), whose production is associated with the formation of a string-wall network. If walls bounded by strings persist, which…

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Abstract
In this paper we explore the possibility of observable gravitational waves as a manifestation of the QCD axion dynamics. In particular, we focus on dynamical axion models which solve the…

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