![]() ![]() With the precision of this telescope, a newspaper in New York could be read from a street café in Berlin.įigure: Event horizon sizes for different theories of gravity. In the Event Horizon Telescope collaboration, telescopes from 19 observatories around the globe are interconnected to form a virtual giant telescope with a dish as big as the Earth itself. Black holes, theory predicts, can be described by a handful of properties: mass, spin, and a variety of possible charges. The "edge" of a black hole is known as the event horizon, the boundary around th e concentration of mass beyond which light and matter cannot escape and which makes the black hole “black”. New Zealand physicist Roy Kerr showed rotation can change the black hole’s size and the geometry of its surroundings. This was an importan t first step and our constraints will be improved as new observations are made.”Īs first pointed out by the German astronomer Karl Schwarzschild, black holes bend space - time to an extreme degree due to their extraordinary concentration of mass, and heat u p the matter in their vicinity so that it begins to glow. It is therefore very important to obtain results like ours, which determine what is plausible and what is not. While we still struggle with some of the consequences of black holes – such as the event horizon or the singularity – we seem always keen to find new black hole solutions also in other theories. ![]() Luciano Rezzolla, Chair for Theoretical Phy sics at Frankfurt University and EHT Collaboration Board Member, says: “The idea of black holes for us theoretical physicists is at the same time a source of concern and of inspiration. Currently, we cannot reject these theories when describing the shadow size of M 87 *, but our calculations constrain the range of validity of these black hole models." Prashant Kocherlakota, scientist at Frankfurt University and EHT Collaboration member, explains: "With the data recorded by the EHT Collaboration, we can now test different theories of physics with black hole images. The result of these investigations: t he data from M 87 * are in excellent agreement with the Einstein - based theories and to a certain extent with the string - based theories. The image of M 87 *, taken in 2019 was a further evidence of the actual existence of black holes after, e.g., the measurement of gravitational waves in 2015. These results are presented in today’s issue of the Physical Review D journal.Ī team of scientists from the Event Horizon Telescope Collaboration led by Prashant Kocherlakota and L uciano Rezzolla from the Institute of Theoretical Physics at the Goethe University Frankfurt in Germany has investigated for the first time how the different theories fit with the observational data of the black hole M 87 * at the centre of the galaxy Messi er 87. According to the tests, the size of the shadow from M 87 * is in excellent agreement with a black hole predicted by general rela tivity, but narrows the properties of black holes in other theories down. Now a collaboration team led by t heoretical physicists at the Goethe University Frankfurt have analysed data from the black hole M 87 * to test Albert Einstein's theory of general relativity. In 2019, the EHT C ollaboration published the first image of a black hole located at the centre of the galaxy M 87. Event Horizon Telescope Collaboration scientists use data which produced the first image of a black hole to constrain its fundamental properties. ![]()
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