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 rethought.
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' (a snowflake is a good example of a fractal). 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 PhD student from the International Center 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.
ICRAR / UWA
+61 8 6488 7771, cell: +61 438 361 876
Dr. Wiebke Ebeling
ICRAR / Curtin University / CAASTRO
+61 8 9266 9174, cell: +61 423 933 444
CSIRO / AAO
+61 2 9372 7771, cell: +61 419 635 905
ICRAR / UWA
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Dr. Tamara Davis
Univ. of Queensland
+61 7 3346 7952
Professor Matthew Colless
+61 2 9372 4812, cell: +61 431 898 345
Professor Lister Staveley-Smith
Deputy Director of Science, ICRAR / CAASTRO
+61 8 6488 4550, cell: +61 425 212 592
Morag Scrimgeour et al. 2012, "The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity." Accepted for publication in the Monthly Notices of the Royal Astronomical Society, Vol. 425, Issue 1: http://labs.adsabs.harvard.edu/ui/abs/2012arXiv1205.6812S
ICRAR is a joint venture between Curtin University and The University of Western Australia providing research excellence in the field of radio astronomy. ICRAR researchers are playing an important role in the design and ultimate success of the Square Kilometer Array radio telescope project.
This project is part of 'The Dark Universe' theme of the ARC Center of Excellence for All-sky Astrophysics (CAASTRO, http://www.caastro.org).