Cosmology with the Einstein telescope: No Slip Gravity model and redshift specifications
Mitra A. Mifsud J. Mota D.F. Parkinson D.
1 April 2021Oxford University Press
Monthly Notices of the Royal Astronomical Society
2021#502Issue 45563 - 5575 pp.
The Einstein telescope and other third-generation interferometric detectors of gravitational waves are projected to be operational post 2030. The cosmological signatures of gravitational waves would undoubtedly shed light on any departure from the current gravitational framework. We here confront a specific modified gravity model, the No Slip Gravity model, with forecast observations of gravitational waves. We compare the predicted constraints on the dark energy equation of state parameters $w_0^{}-w_a^{}$, between the modified gravity model and that of Einstein gravity. We show that the No Slip Gravity model mimics closely the constraints from the standard gravitational theory, and that the cosmological constraints are very similar. The use of spectroscopic redshifts, especially in the low-redshift regime, lead to significant improvements in the inferred parameter constraints. We test how well such a prospective gravitational wave dataset would function at testing such models, and find that there are significant degeneracies between the modified gravity model parameters, and the cosmological parameters that determine the distance, due to the gravitational wave dimming effect of the modified theory.
cosmological parameters , gravitational waves , methods: statistical
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School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon, 34055, South Korea
Institute of Space Sciences and Astronomy, University of Malta, Msida, MSD, 2080, Malta
Institute of Theoretical Astrophysics, University of Oslo, Sem Slands vei 13, Oslo, 0371, Norway
University of Science and Technology, Daejeon, 34113, South Korea
School of Engineering and Digital Sciences
Korea Astronomy and Space Science Institute
Institute of Space Sciences and Astronomy
Institute of Theoretical Astrophysics
University of Science and Technology
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