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Article overview
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The Fifth Force in the Local Cosmic Web | Harry Desmond
; Pedro G Ferreira
; Guilhem Lavaux
; Jens Jasche
; | Date: |
20 Feb 2018 | Abstract: | Extensions of the standard models of particle physics and cosmology may lead
to the presence of long-range fifth forces whose strength and range depend on
gravitational environment. Fifth forces on astrophysical scales are best
studied in the cosmic web where perturbation theory breaks down. We present
precision constraints on a symmetron- or chameleon-screened fifth force with
Yukawa coupling -- as well as an unscreened fifth force with differential
coupling to galactic mass components -- on megaparsec scales by searching for
the displacement it predicts between galaxies’ stellar and gas mass centroids.
Taking data from the ALFALFA HI survey, identifying galaxies’ gravitational
environments with the maps of Desmond et al. (2018) and forward-modelling with
a Bayesian likelihood framework, we set upper bounds on the strength of the
fifth force relative to Newtonian gravity, $Delta G/G$, from $sim 10^{-2}$
($1sigma$) for range $lambda_C = 50$ Mpc to $sim 10$ for $lambda_C = 500$
kpc ($f_{R0}<10^{-6}$). The analogous constraints without screening are $sim
10^{-2}$ and $10^{-1}$. These are the strongest and among the only fifth force
constraints on galaxy scales. We show how our results may be strengthened with
future survey data and identify the key features of an observational programme
for furthering fifth force tests beyond the Solar System. | Source: | arXiv, 1802.7206 | Services: | Forum | Review | PDF | Favorites |
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