English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present measurements of both scale- and time-dependent deviations from thestandard gravitational field equations. These late-time modifications areintroduced separately for relativistic and non-relativistic particles, by wayof the parameters $G_{\rm matter}(k,z)$ and $G_{\rm light}(k,z)$ using two binsin both scale and time, with transition wavenumber $0.01$ Mpc$^{-1}$ andredshift 1. We emphasize the use of two dynamical probes to constrain this setof parameters, galaxy power spectrum multipoles and the direct peculiarvelocity power spectrum, which probe fluctuations on different scales. Themultipole measurements are derived from the WiggleZ and BOSS Data Release 11CMASS galaxy redshift surveys and the velocity power spectrum is measured fromthe velocity sub-sample of the 6-degree Field Galaxy Survey. We combine withadditional cosmological probes including baryon acoustic oscillations, Type IaSNe, the cosmic microwave background (CMB), lensing of the CMB, and thetemperature--galaxy cross-correlation. Using a Markov Chain Monte Carlolikelihood analysis, we find the inferred best-fit parameter values of $G_{\rmmatter}(k,z)$ and $G_{\rm light}(k,z)$ to be consistent with the standard modelat the $95\%$ confidence level. Furthermore, accounting for theAlcock-Paczynski effect, we perform joint fits for the expansion history andgrowth index gamma; we measure $\gamma = 0.665 \pm 0.0669$ ($68\%$ C.L) for afixed expansion history, and $\gamma = 0.73^{+0.08}_{-0.10}$ ($68\%$ C.L) whenthe expansion history is allowed to deviate from $\Lambda$CDM. With a fixedexpansion history the inferred value is consistent with GR at the $95\%$ C.L;alternatively, a $2\sigma$ tension is observed when the expansion history isnot fixed, this tension is worsened by the combination of growth and SNe data.

Searching for Modified Gravity: Scale and Redshift Dependent Constraints from Galaxy Peculiar Velocities