WiggleZ confirms the Big Picture of the Universe

Aug 21, 2012

We know that stars group together to form galaxies, galaxies clump to make clusters and clusters gather to create structures known as superclusters. At what scale though, if at all, does this Russian doll-like structure stop? Scientists have been debating this very question for decades because clustering on large scales would be in conflict with our ‘standard model’ of cosmology. The current model is based on Einstein’s equations assuming everything is smooth on the largest scales. If matter were instead clumpy on very large scales, then the entire model would need to be re-thought.

Cosmologists agree that on ‘small’ scales (tens of millions of light years), matter in the Universe is highly clustered. So the ‘standard model’ can only hold true if the Universe transitions to an even distribution of matter (homogeneity) on larger scales, irrespective of the viewing direction. However, some scientists have recently argued that the entire Universe never becomes homogenous, and that it is clustered on all scales, much like one of Mandelbrot’s famous ‘fractals’ (snowflakes and broccoflowers are good examples of fractals). If the Universe has properties similar to a fractal, our description of space and time is wrong, and our understanding of things like Dark Energy is deeply flawed.

New data from a recently completed galaxy survey was published last night by a CAASTRO PhD student at the International Centre for Radio Astronomy Research (ICRAR) and The University of Western Australia in Perth and her colleagues. This paper might finally put an end to this long running debate.

Using the Anglo-Australian Telescope, Ms Morag Scrimgeour has found that on distance scales larger than 350 million light years, matter is distributed extremely evenly, with little sign of fractal-like patterns.

“We used a survey called WiggleZ which contains more than 200,000 galaxies, and probes a cosmic volume of about 3 billion light years, cubed,” Ms Scrimgeour explains “This makes it the largest survey ever used for this type of measurement of the large scale Universe.”

This finding is extremely significant for cosmologists as it confirms that the tools being used to describe the Universe are the right tools for the job after all. Had evidence been found confirming large-scale fractals, it would have left cosmologists without a working model for the Universe, sending them back to the drawing board to painstakingly adjust theories.

“Our entire understanding of the Universe, even how we interpret the light we see from stars and galaxies, would be affected if the Universe were not even on large scales. By looking at how the WiggleZ galaxies are distributed in space on scales up to 930 million light years, we find that they are very close to homogeneous, meaning there is no large-scale clustering. So we can say with a high degree of certainty that our picture of the large-scale Universe is correct,” said Ms Scrimgeour.

This project is part of ‘The Dark Universe’ theme of CAASTRO. Please also see our video press release.

Publication details:

Morag Scrimgeour et al. “The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity.” Accepted for publication in the Monthly Notices of the Royal Astronomical Society Journal, Vol 425 Issue 1 2012.

More information:

Morag Scrimgeour, CAASTRO PhD student at ICRAR – UWA
Ph: +61 8 6488 7754 M: +61 447 572 997 E: morag.scrimgeour@icrar.org

Dr Tamara Davis, CAASTRO Associate Investigator at UQ
Ph: +61 7 3346 7952 E: tamarad@physics.uq.edu.au

Prof Matthew Colless, CAASTRO Partner Investigator at the AAO
Ph: +61 2 9372 4812 M: +61 431 898 345 E: colless@aao.gov.au

Prof Lister Staveley-Smith, CAASTRO Deputy Director at ICRAR – UWA
Ph: +61 8 6488 4550 M: +61 425 212 592 E: lister.staveley-smith@icrar.org

Media contacts:

Dr Wiebke Ebeling, CAASTRO Education & Outreach Coordinator at ICRAR – Curtin University
Ph: +61 8 9266 9174 M: +61 423 933 444 E: wiebke.ebeling@icrar.org

Kirsten Gottschalk, ICRAR – UWA
Ph: +61 8 6488 7771 M: +61 438 361 876 E: kirsten.gottschalk@icrar.org

Helen Sim, CSIRO / AAO
Ph: +61 2 9372 7771 M: +61 419 635 905 E: hsim@aao.gov.au