Detecting new fundamental fields with pulsar timing arrays - INSPIRE

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Detecting new fundamental fields with pulsar timing arrays

Chao Zhang
(
- Shanghai Jiao Tong U.
)
,
Ning Dai
(
- Hua-Zhong U. Sci. Tech.
)
,
Qing Gao
(
- SWU, Chongqing
)
,
Yungui Gong
(
- Hua-Zhong U. Sci. Tech. and
- Ningbo U.
)
,
Tong Jiang
(
- Hua-Zhong U. Sci. Tech.
)

Jul 3, 2023

15 pages

Published in:

Phys.Rev.D 108 (2023) 10, 104069

Published: Nov 15, 2023

e-Print:

2307.01093 [gr-qc]

DOI:

10.1103/PhysRevD.108.104069 (publication)

View in:

ADS Abstract Service

reference search23 citations

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Abstract: (APS)

Strong evidence of the existence of the stochastic gravitational wave background (SGWB) has been reported recently by the North American Nanohertz Observatory for Gravitational Waves, the Parkes Pulsar Timing Array, the European Pulsar Timing Array, and the Chinese Pulsar Timing Array Collaborations. The Bayesian posteriors of the SGWB amplitude and spectrum are compatible with astrophysical predictions for the SGWB from a population of supermassive black hole binaries (SMBHBs). We discuss the modifications arising from the extra scalar or vector radiation to the characteristic dimensionless strain of gravitational waves from SMBHBs and explore the possibility of detecting charges carried by supermassive black holes in modified gravity. The Bayesian posteriors on the tensor amplitude and the spectral exponent of SGWB are

\log_{10} A_{T} = - 14.6 4_{- 0.27}^{+ 0.19}

and

α = - 0.3 5_{- 0.25}^{+ 0.23}

, and a rough upper limit

\log_{10} A_{V, S} \leq - 15.2

is obtained for the SGWB scalar or vector amplitude. The Bayesian factor between the models with and without charge is only 0.6, so the current PTA data do not favor charged SMBHBs over neutral SMBHBs.

Note:

15 pages, 3 figures; Comments are welcome

gravitational radiation: background
polarization: scalar
black hole: binary
gravitational radiation: stochastic
radiation: vector
statistical analysis: Bayesian
NANOGrav
pulsar
spectral
black hole: mass

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