Axion-like universal gravitational wave interpretation of pulsar timing array data

Abstract Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of non-linear dynamics. Beginning with a general phenomenological description of GWs associated with soliton formation, we demonstrate that universal GW background from axion-like particle solitonic oscillons provides a viable interpretation to the recent NANOGrav 15 year pulsar timing array (PTA) data, which does not suffer from the overproduction of primordial black holes. We show that PTA data displays preference for models where formed solitons do not strongly interact or cluster. Coincidence observations with Nancy Roman telescope will allow to discriminate between distinct scenarios of cosmological solitons.

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Publication Details

Journal
Classical and Quantum Gravity
Published
2024-12-12
DOI
https://doi.org/10.1088/1361-6382/ad9e67
Citations
5
Primary Topic
Pulsars and Gravitational Waves Research
Type
article
Field-Weighted Citation Impact
1.66

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Axion-like universal gravitational wave interpretation of pulsar timing array data

Shi Pi, Misao Sasaki, Kaloian D. Lozanov, Ao Wang et al.
5 citations
Classical and Quantum Gravity
Pulsars and Gravitational Waves Research
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article

Axion-like universal gravitational wave interpretation of pulsar timing array data

Shi Pi, Misao Sasaki, Kaloian D. Lozanov, Ao Wang, Volodymyr Takhistov
article en
5 citations

Abstract

Abstract Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of non-linear dynamics. Beginning with a general phenomenological description of GWs associated with soliton formation, we demonstrate that universal GW background from axion-like particle solitonic oscillons provides a viable interpretation to the recent NANOGrav 15 year pulsar timing array (PTA) data, which does not suffer from the overproduction of primordial black holes. We show that PTA data displays preference for models where formed solitons do not strongly interact or cluster. Coincidence observations with Nancy Roman telescope will allow to discriminate between distinct scenarios of cosmological solitons.

Classical and Quantum GravityVol. 42(3)
High Energy Accelerator Research Organization (JP), Kavli Institute for the Physics and Mathematics of the Universe (JP), National Taiwan University (TW), Chinese Academy of Sciences (CN), The Graduate University for Advanced Studies, SOKENDAI (JP), Peking University (CN), Kyoto University (JP), Institute of Theoretical Physics (CN), University of Chinese Academy of Sciences (CN), International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles, The University of Tokyo (JP)
Key Technology Research and Development Program of Shandong, Japan Society for the Promotion of Science
Reduced inequalities
Openalex Percentile: Top 16%
Pulsars and Gravitational Waves Research
1.66
DOISourceOpenAlex
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