![]() It is the mysterious dark universe dark matter and dark energy. The discovery has significance for the phenomena in the universe that researchers are working to unravel. In that way our observations confirm the theory of relativity", explains Radek Wojtak. Our analysis of observations of galaxy clusters show that the redshift of the light is proportionally offset in relation to the gravitational influence from the galaxy cluster's gravity. "It turned out that the theoretical calculations of the gravitational redshift based on the general theory of relativity was in complete agreement with the astronomical observations. By using the general theory of relativity he could now calculate the gravitational redshift for the different locations of the galaxies. Then he measured the entire galaxy cluster's total mass and with that got the gravitational potential. Credit: Dark Cosmology Centre, Niels Bohr Institute The observed data confirms Einstein’s general theory of relativity. It is a grotesquely large scale, which is a factor 1,022 times greater (ten thousand billion billion times larger than the laboratory test). With the new research the theory has been tested on a cosmological scale for the first time by analyzing galaxies in galaxy clusters in the distant universe. Until now, the gravitational redshift has only been tested with experiments and observations in relation to distances her on Earth and in relation to the solar system. "We could measure small differences in the redshift of the galaxies and see that the light from galaxies in the middle of a cluster had to 'crawl' out through the gravitational field, while it was easier for the light from the outlying galaxies to emerge", explains Radek Wojtak. The researchers have studied the galaxies lying in the middle of the galaxy clusters and those lying on the periphery and measured the wavelengths of the light. This gravity affects the light being sent out into space from the galaxies. Galaxy clusters are accumulations of thousands of galaxies, held together by their own gravity. Radek Wojtak, together with colleagues Steen Hansen and Jens Hjorth, has analysed measurements of light from galaxies in approximately 8,000 galaxy clusters. We live in an era with the technological ability to actually measure such phenomena as cosmological gravitational redshift", says astrophysicist Radek Wojtak, Dark Cosmology Centre under the Niels Bohr Institute at the University of Copenhagen. But the gravitational influence of light has never before been measured on a cosmological scale. Furthermore, according to Einstein's general theory of relativity, the light and thus the redshift is also affected by the gravity from large masses like galaxy clusters and causes a gravitational redshift of the light. The redshift indicates how much the universe has expanded from when the light left until it was measured on Earth. Observations of large distances in the universe are based on measurements of the redshift, which is a phenomenon where the wavelength of the light from distant galaxies is shifted more and more towards the red with greater distance. The results have been published in the journal Nature. The observations confirm the theoretical predictions. Now astrophysicists at the Dark Cosmology Centre at the Niels Bohr Institute have managed to measure how the light is affected by gravity on its way out of galaxy clusters. At the same time all interpretations in astronomy are based on the correctness of the theory of relatively, but it has never before been possible to test Einstein's theory of gravity on scales larger than the solar system. ![]() Credit: Hubble Space TelescopeĪll observations in astronomy are based on light emitted from stars and galaxies and, according to the general theory of relativity, the light will be affected by gravity. This gravity affects the light that is sent out into space from the galaxies. Galaxy clusters are accumulations of thousands of galaxies (every light in the image is a galaxy), which are held together by their own gravity. ![]() Researchers have analyzed measurements of the light from galaxies in approximately 8,000 galaxy clusters.
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