A sound horizon independent measurement of $H_0$ from BOSS, DESI and DES Y3

TL;DR

This paper introduces a novel method to measure the Hubble constant independently of the sound horizon by combining large-scale structure data, achieving 2-4% precision and exploring implications for dark energy.

Contribution

It presents the first sound horizon independent measurement of $H_0$ using multiprobe large-scale structure analysis with effective field theory, including bispectrum data.

Findings

Measured $H_0$ with 3-4% precision without supernovae.

Detected a slight deviation in the BAO scale parameter from $ m extbf{ extLambda CDM}$.

Results are consistent with evolving dark energy scenarios.

Abstract

We present a sound horizon independent measurement of the Hubble parameter using a multiprobe large-scale structure analysis. Removing the dependency on the sound horizon with a rescaling procedure at the matter power spectrum level, we analyse the BOSS full-shape power spectrum and bispectrum (for the first time) using the effective field theory of large-scale structure up to one loop. We combine this analysis with the auto- and cross-angular power spectra from the DESI Legacy Imaging Survey DR9, the $3 \times 2$pt analysis from DES Y3, and the CMB gravitational lensing power spectrum from Planck PR3. Our baseline analysis, that does not rely on supernovae data, yields $h = 0.702^{+0.022}_{-0.024}$, $\Omega_m = 0.310 \pm 0.013$, and $\sigma_8 = 0.799 \pm 0.020$, corresponding to $3-4 \%$ precision measurements. When adding supernovae data from Pantheon+, we obtain a $2.6 \%$ measurement of $h$, with $h = 0.686 \pm 0.018$. We further note that our EFTBOSS analysis indicates a slight deviation of the BAO scale parameter (at $1.8 \sigma$) from its $\Lambda$CDM value, caused by the small scales of the bispectrum. We finally use the sound horizon-free EFTBOSS analysis as a diagnosis for the presence of new physics, finding that our results are consistent with the recent hints of evolving dark energy.