%0 Generic %1 arendse2019lowredshift %A Arendse, Nikki %A Agnello, Adriano %A Wojtak, Radosłav %D 2019 %K tifr %T Low-redshift measurement of the sound horizon through gravitational time-delays %U http://arxiv.org/abs/1905.12000 %X The Cosmic Microwave Background (CMB) yields an inference on the matter sound horizon, within the Standard Model. Independent, direct measurements of the sound horizon are then a probe of possible deviations from the Standard Model. We aim at measuring the sound horizon $r_s$ from low-redshift indicators, completely independent from CMB inference. We use the measured product $H(z)r_s$ from Baryon Acoustic Oscillations (BAO), plus Supernovae~Ia to constrain $H(z)/H_0$ and time-delay lenses analysed by the H0LiCOW collaboration to anchor cosmological distances ($H_0^-1$). Additionally, we investigate the influence of adding a sample of higher-redshift quasars with standardisable UV-Xray luminosity distances. We adopt polynomial expansions in $H(z)$ or in comoving distances, so that our inference is completely independent of any underlying cosmological model. Our measurements are independent of Cepheids and systematics from peculiar motions, to within percent-level accuracy. The inferred sound horizon $r_s$ varies between $(133 8)$~Mpc and $(138 5)$~Mpc across different models. The discrepancy with CMB measurements is robust against model choice. Statistical uncertainties are comparable to systematics. The combination of time-delay lenses, supernovae and BAO yields a cosmology-independent (and Cepheid-calibration-independent) distance ladder, and a CMB-independent measurement of $r_s.$ These cosmographic measurements are then a competitive test of the Standard Model, regardless of hypotheses on the underlying cosmology.

@misc{arendse2019lowredshift, abstract = {The Cosmic Microwave Background (CMB) yields an inference on the matter sound horizon, within the Standard Model. Independent, direct measurements of the sound horizon are then a probe of possible deviations from the Standard Model. We aim at measuring the sound horizon $r_s$ from low-redshift indicators, completely independent from CMB inference. We use the measured product $H(z)r_s$ from Baryon Acoustic Oscillations (BAO), plus Supernovae~\textsc{I}a to constrain $H(z)/H_{0}$ and time-delay lenses analysed by the H0LiCOW collaboration to anchor cosmological distances ($\propto H_{0}^{-1}$). Additionally, we investigate the influence of adding a sample of higher-redshift quasars with standardisable UV-Xray luminosity distances. We adopt polynomial expansions in $H(z)$ or in comoving distances, so that our inference is completely independent of any underlying cosmological model. Our measurements are independent of Cepheids and systematics from peculiar motions, to within percent-level accuracy. The inferred sound horizon $r_s$ varies between $(133 \pm 8)$~Mpc and $(138 \pm 5)$~Mpc across different models. The discrepancy with CMB measurements is robust against model choice. Statistical uncertainties are comparable to systematics. The combination of time-delay lenses, supernovae and BAO yields a cosmology-independent (and Cepheid-calibration-independent) distance ladder, and a CMB-independent measurement of $r_s.$ These cosmographic measurements are then a competitive test of the Standard Model, regardless of hypotheses on the underlying cosmology.}, added-at = {2019-05-30T07:34:21.000+0200}, author = {Arendse, Nikki and Agnello, Adriano and Wojtak, Radosłav}, biburl = {https://www.bibsonomy.org/bibtex/2b59f569d4280f629cf8ef747003319ac/citekhatri}, description = {Low-redshift measurement of the sound horizon through gravitational time-delays}, interhash = {f5dc7af3a61ee83987d8e77449f25971}, intrahash = {b59f569d4280f629cf8ef747003319ac}, keywords = {tifr}, note = {cite arxiv:1905.12000Comment: A&A subm. 28/05/2019, 6 pages, 3 figures}, timestamp = {2019-05-30T07:34:21.000+0200}, title = {Low-redshift measurement of the sound horizon through gravitational time-delays}, url = {http://arxiv.org/abs/1905.12000}, year = 2019 }