Holes in the Universe sharpen cosmic measurements

Holes in the Universe sharpen cosmic measurements
The change in the average shape of voids caused by Doppler distortions and the effects of dark energy and curvature. Credit: University of Portsmouth

Regions of the Universe containing very few or no galaxies—known as voids—can help measure cosmic expansion with much greater precision than before, according to new research.

The study looked at the shapes of voids found in data from the Sloan Digital Sky Survey (SDSS) collaboration. Voids come in a variety shapes, but because they have no preferred direction of alignment, a large enough sample of them can on average be used as "standard spheres"—objects which should appear perfectly symmetric in the absence of any distortions.

However, the observed shapes of these spheres are distorted by Doppler shifts in the redshifts of nearby galaxies caused by the local velocity field, and by the nature and amounts of dark matter and dark energy that make up 95% of the Universe. This distortion can be theoretically modelled, and the new work shows it can now be precisely measured.

The research was led by the University of Portsmouth, a world leader in cosmology, and is published this week in Physical Review D.

The new measurement of the distortion around voids used the Baryon Oscillation Spectroscopic Survey (BOSS) of galaxies from SDSS, that was designed to measure dark energy and the curvature of space.

For measuring a key aspect of the cosmic expansion, the new method greatly outperforms the standard baryon acoustic oscillation (BAO) technique that BOSS was designed for. The new results agree with the simplest model of a flat Universe with a cosmological constant dark , and tighten the constraints on alternative theories.

Lead author, Dr. Seshadri Nadathur, research fellow at the University's Institute of Cosmology and Gravitation (ICG), said: "This measurement tremendously upgrades the previous best results from BOSS—the precision is equivalent to getting data from a hypothetical survey four times as large as BOSS, completely for free. It really helps pin down the properties of ."

"These results also mean that the expected science results from facilities such as the European Space Agency's Euclid satellite mission and the Dark Energy Spectroscopic Instrument—in which the astronomy community have invested a lot of resources—can be even better than previously thought."

The other authors include Portsmouth's Ph.D. student Paul Carter, research fellows Dr. Hans Winther and Dr. Julian Bautista, and former Portsmouth Professor Will Percival, who has recently taken up a new role in Canada.


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More information: Seshadri Nadathur et al. Beyond BAO: Improving cosmological constraints from BOSS data with measurement of the void-galaxy cross-correlation, Physical Review D (2019). DOI: 10.1103/PhysRevD.100.023504
Journal information: Physical Review D

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Jul 10, 2019
The investigation of the large scale structure of the World revealed its high inhomogeneity. During the last couple of decades a rich picture of groups, clusters and superclusters of the galaxies separated by a number of huge empty voids was released. The foam-like structure becomes more and more clear. The building blocks of the large scale structure are superclusters and voids which are forming the supercluster-void network. This network has pronounced filamentary structure. In this paper we discuss the mechanism of creation and stabilization of the Macrostructure of the World in the frame of elastonic model.
https://www.acade...he_World

Jul 12, 2019
To sum up Hubble parameter at current universe age [km*s^-1*Mpc^-1]:

Planck CMB [2018] consensus [Planck w/ dust+BAO/RSD+WL+lensing] 68.09 +0.45/-0.45

GW170817 star merger [2019] consensus [GW+EM+VLBI+LC+PLJ] 68.1 +4.5/-4.3

CMASS cosmic voids [2019] consensus [Planck+LOWZ+CMASS+voids] 67.71 +0.43/-0.43

[ https://www.natur...cle-info ; in GW170817 analysis jet model is a matter of taste, I choose the synthetic that scans parameters used.]

Pretty neat. I suspect we will find a problem with the cosmic ladder observations; but you never know.

Jul 17, 2019
I got the CMB result wrong, it should be [Planck w/dust+lowE+lensing+BAO] 67.66 + 0.42 - 0.42

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