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  Testing the Quasar Hubble Diagram with LISA Standard Sirens

Speri, L., Tamanini, N., Caldwell, R. R., Gair, J., & Wang, B. (2021). Testing the Quasar Hubble Diagram with LISA Standard Sirens. Physical Review D, 103(8): 083526. doi:10.1103/PhysRevD.103.083526.

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 Creators:
Speri, Lorenzo1, Author              
Tamanini, Nicola1, Author              
Caldwell , Robert R., Author
Gair, Jonathan1, Author              
Wang, Benjamin, Author
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1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Quasars have recently been used as an absolute distance indicator, extending the Hubble diagram to high redshift to reveal a deviation from the expansion history predicted for the standard, $\Lambda$CDM cosmology. Here we show that the Laser Interferometer Space Antenna (LISA) will efficiently test this claim with standard sirens at high redshift, defined by the coincident gravitational wave (GW) and electromagnetic (EM) observations of the merger of massive black hole binaries (MBHBs). Assuming a fiducial $\Lambda$CDM cosmology for generating mock standard siren datasets, the evidence for the $\Lambda$CDM model with respect to an alternative model inferred from quasar data [Nat. Astron. 3, 272 (2019)] is investigated. By simulating many realizations of possible future LISA observations, we find that for $50\%$ of these realizations (median result) 4 MBHB standard siren measurements will suffice to strongly differentiate between the two models, while 14 standard sirens will yield a similar result in $95\%$ of the realizations. In addition, we investigate the measurement precision of cosmological parameters as a function of the number of observed LISA MBHB standard sirens, finding that 15 events will on average achieve a relative precision of $5\%$ for $H_0$, reducing to $3\%$ and $2\%$ with 25 and 40 events, respectively. Our investigation clearly highlights the potential of LISA as a cosmological probe able to accurately map the expansion of the universe at $z\gtrsim 2$, and as a tool to cross-check and cross-validate cosmological EM measurements with complementary GW observations.

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 Dates: 2020-10-182021
 Publication Status: Published in print
 Pages: 17 pages, 9 figures
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 Rev. Type: -
 Identifiers: arXiv: 2010.09049
DOI: 10.1103/PhysRevD.103.083526
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 103 (8) Sequence Number: 083526 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258