one of the biggest mysteries The surrounding dark matter is its distribution in the universe. Recent discoveries show that dark matter, the mysterious force responsible for the accelerating expansion of the universe, is evenly distributed in space and time.
This discovery helps to better define the role dark matter plays in the energy and matter content of the universe. The study used observations of galaxy clusters taken by the eROSITA X-ray instrument mounted on the Russian-German Spektr-RG space telescope, launched into orbit in 2019.
According to Matthias Klein, co-author of the recent study, an astrophysicist at Ludwig-Maximillians-Universitat Munchen in Germany, “We can learn a lot about the nature of dark energy by counting the number of galaxy clusters that form in the universe as a function of time.”
Galaxy clusters are useful for understanding dark matter because this repulsive force prevents the formation of large-scale massive cosmic structures such as galaxy clusters. Researchers can get an idea of the nature of dark matter by counting the number of galaxy clusters that form over time in the universe.
The eROSITA Final Equatorial Depth Survey (eFEDS) discovered nearly 500 galaxy clusters, making it one of the largest examples of low-mass galaxy clusters ever found. These clusters date back to about 10 billion years ago, to the 13.8 billion-year history of the universe..
The study team combined these observations with optical data from the Subaru Hyper Suprime-Cam Strategic Program, which enabled the first cosmological study using galaxy clusters. The results confirm that Dark matter makes up about 76% of the universe’s total energy density. and that this energy density is constant over time and uniform across space.
The findings were also in line with other independent approaches to investigating dark matter, such as previous work on galaxy clusters and weak gravitational lensing. However, while the new research provides more information about dark matter, it remains a mystery that physicists are eager to unravel.
Source: Tec Mundo
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