Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/12/017
Keywords
gravitational wave detectors; gravitational waves; experiments; dark energy theory; modified gravity
Funding
- National Natural Science Foundation of China [11690022, 11821505, 11991052, 11947302]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB23030100]
- Key Research Program of the CAS [XDPB15]
- Key Research Program of FrontierSciences of CAS
- Korean Government
- Korean Local Governments - Gyeongsangbuk-do Province
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This study investigates the potential of space-borne atom interferometers (AIs) as gravitational-wave (GW) detectors and their applications in cosmology. Using AEDGE as the fiducial AI GW detector, it is found that around 30 bright sirens can be obtained within a five-year period, allowing for measurements of H0 and improvements in the equation of state of dark energy. Additionally, modifications in GW propagation on cosmological scales can constrain deviations from general relativity at a precision level of 5.7%.
Atom interferometers (AIs) as gravitational-wave (GW) detectors have been pro-posed a decade ago. Both ground and space-based projects will be in construction and preparation in the near future. In this paper, for the first time, we investigate the potential of the space-borne AIs on detecting GW standard sirens and hence the applications on cos-mology. We consider AEDGE as our fiducial AI GW detector and estimate the number of bright sirens that would be obtained within a 5-years data-taking period of GW and with the follow-up observation of electromagnetic (EM) counterparts. We then construct the mock catalogue of bright sirens and predict their ability on constraining cosmological parameters such as the Hubble constant, dynamics of dark energy, and modified gravity theory. Our preliminary results show around order O (30) bright sirens can be obtained from a 5-years operation time of AEDGE and the follow-up observation of EM counterparts. The bright sirens alone can measure H0 with a precision 2.1%, which is sufficient to arbitrate the Hub-ble tension. Combining current most precise electromagnetic experiments, the inclusion of AEDGE bright sirens can improve the measurement of the equation of state of dark energy, though marginally. Moreover, by modifying GW propagation on cosmological scales, the deviations from general relativity (modified gravity theory effects) can be constrained at 5.7% precision level.
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