Angular correlation and deformed Hellings-Downs curve from spin-2 ultralight dark matter
The pulsar timings are sensitive to both the nanohertz gravitational-wave background and the oscillation of ultralight dark matter. The Hellings-Downs angular correlation curve provides a criterion to search for stochastic gravitational-wave backgrounds at nanohertz via pulsar timing arrays. We study the angular correlation of the timing residuals induced by the spin-2 ultralight dark matter, which is different from the usual Hellings-Downs correlation. At a typical frequency, we show that the spin-2 ultralight dark matter can give rise to the deformation of the Hellings-Downs correlation curve induced by the stochastic gravitational wave background.
Authors
- Jing-Rui Zhang (ORCID: https://orcid.org/0000-0002-5259-1450)
- Yun‐Long Zhang (ORCID: https://orcid.org/0000-0002-7225-8479)
- Rong-Gen Cai (ORCID: https://orcid.org/0000-0002-3539-7103)
Institutions
- Ningbo University (CN)
- Chinese Academy of Sciences (CN)
- Center for Theoretical Physics (PL)
- International Centre for Theoretical Physics Asia-Pacific (CN)
- Institute of Theoretical Physics (CN)
- National Astronomical Observatories (CN)
- University of Chinese Academy of Sciences (CN)
- University College of Applied Science (PS)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2024-08-26
- DOI
- https://doi.org/10.1103/physrevd.110.044052
- Citations
- 7
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 2.32
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China