Analysis of millions of galaxies upholds Albert Einstein’s ideas about gravity and also offers tantalising new hints of how dark energy may have evolved
Albert Einstein’s theory of general relativity has been proven right on the largest scale yet. An analysis of millions of galaxies shows that the way they have evolved and clustered over billions of years is consistent with his predictions.Ever since Einstein put forward his theory of gravity more than a century ago, researchers have been trying to find scenarios where it doesn’t hold up.
DESI has so far collected data on how nearly 6 million galaxies clustered over the course of the past 11 billion years. Ishak-Boushaki and his colleagues combined this with results from several other large surveys, such as those mapping theand supernovae. Then, they compared this with predictions from a theory of gravity that encompassed both Einstein’s ideas and more contemporary competing theories of modified gravity. They found no deviation from Einstein’s gravity.
“The fact that we see agreement with and still see this departure from the cosmological constant really open the Pandora’s box of what the data could actually be telling us,” says Ishak-Boushaki.DESI will keep collecting data for several more years and ultimately record the positions and properties of 40 million galaxies, which the three scientists all say will bring clarity on how to correctly marry general relativity and theories of dark energy.
Allali says he is anticipating these results to be consequential in several important ways, such as pinpointing shifts in the, which is a measure of the rate of the universe’s expansion, narrowing down the mass of elusive particles called neutrinos and even searching for new cosmic ingredients like “This analysis will weigh in on a lot more than gravity, it will weigh in on all of cosmology,” he says.
General Relativity Gravity Dark Energy
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