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  Testing modified gravity at cosmological distances with LISA standard sirens

Belgacem, E., Calcagni, G., Crisostomi, M., Dalang, C., Dirian, Y., Ezquiaga, J. M., et al. (2019). Testing modified gravity at cosmological distances with LISA standard sirens. Journal of Cosmology and Astroparticle Physics, (7): 024. doi:10.1088/1475-7516/2019/07/024.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-BFD0-B Version Permalink: http://hdl.handle.net/21.11116/0000-0004-716C-4
Genre: Journal Article

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 Creators:
Belgacem, E., Author
Calcagni, G., Author
Crisostomi, M., Author
Dalang, C., Author
Dirian, Y., Author
Ezquiaga, J. M., Author
Fasiello, M., Author
Foffa, S., Author
Ganz, A., Author
Garcia-Bellido, J., Author
Lombriser, L., Author
Maggiore, M., Author
Tamanini, N.1, Author              
Tasinato, G., Author
Zumalacarregui, M., Author
Barausse, E., Author
Bartolo, N., Author
Bertacca, D., Author
Klein, A., Author
Matarrese, S., Author
Sakellariadou, M., Author more..
Affiliations:
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,High Energy Physics - Theory, hep-th
 Abstract: Modifications of General Relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the evolution of cosmological perturbations in the scalar and in the tensor sectors. In particular, the modification in the tensor sector gives rise to a notion of gravitational-wave (GW) luminosity distance, different from the standard electromagnetic luminosity distance, that can be studied with standard sirens at GW detectors such as LISA or third-generation ground based experiments. We discuss the predictions for modified GW propagation from some of the best studied theories of modified gravity, such as Horndeski or the more general degenerate higher order scalar-tensor (DHOST) theories, non-local infrared modifications of gravity, bigravity theories and the corresponding phenomenon of GW oscillation, as well as theories with extra or varying dimensions. We show that modified GW propagation is a completely generic phenomenon in modified gravity. We then use a simple parametrization of the effect in terms of two parameters $(\Xi_0,n)$, that is shown to fit well the results from a large class of models, to study the prospects of observing modified GW propagation using supermassive black hole binaries as standard sirens with LISA. We construct mock source catalogs and perform detailed Markov Chain Monte Carlo studies of the likelihood obtained from LISA standard sirens alone, as well as by combining them with CMB, BAO and SNe data to reduce the degeneracies between cosmological parameters. We find that the combination of LISA with the other cosmological datasets allows one to measure the parameter $\Xi_0$ that characterizes modified GW propagation to the percent level accuracy, sufficient to test several modified gravity theories. [Abridged]

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 Dates: 2019-06-042019
 Publication Status: Published in print
 Pages: 69 pages, 18 figures
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1906.01593
URI: http://arxiv.org/abs/1906.01593
DOI: 10.1088/1475-7516/2019/07/024
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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Pages: - Volume / Issue: (7) Sequence Number: 024 Start / End Page: - Identifier: -