Joint cosmological inference of standard sirens and gravitational wave weak lensing
Abstract
We present the first joint inference of standard sirens and gravitational wave weak lensing by filtering of the same dataset. We imagine a postLISA scenario emerging around the late 2030s when LISA will have accumulated a number of detections at high redshift, LIGOVIRGO will have finished observing at low redshift, and Einstein Telescope will have started making new observations out to redshifts possibly overlapping with LISA. Euclid and other cosmological probes will have provided constraints at the percent level by then, but will have mostly exhausted their ability to improve any further. We derive forecasts assuming ∼1 deg^{2} detected sources, in conjunction with a spectroscopic followup (e.g., by Euclid, DESI, or ATHENA). Thanks to the statistical power of standard sirens as a geometry probe—lifting key degeneracies in the gravitational wave weak lensing—and no external priors assumed, the constraints on dark matter and its clustering, namely Ω_{m} and σ_{8}, could be achieved to 2% and 3%. The Hubble constant could be constrained to better than 1% in all cases; the dark energy density, Ω_{Λ}, to 2%; the curvature, Ω_{K}, to 0.02; and the amplitude and spectral tilt of the scalar fluctuations, ln (10^{10}A_{s}) and n_{s}, to 2% and 7%. As a completely independent cosmological probe, with fewer calibration requirements, the joint inference of standard sirens and gravitational wave weak lensing might help solve the tensions currently observed between other cosmological probes, such as the CMB, galaxy lensing, and typeIa supernovae, and distinguish between residual systematics and new physics.
 Publication:

Physical Review D
 Pub Date:
 April 2019
 DOI:
 10.1103/PhysRevD.99.083526
 arXiv:
 arXiv:1812.02730
 Bibcode:
 2019PhRvD..99h3526C
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology
 EPrint:
 7 pages, 1 table, 4 figures