From the expansion of the universe to the movement of the stars from the galaxies, there are several phenomena that can’t be explained by the presence of baryonic matter only. This had contributed into the theory of the occurrence of undetectable dark matter. Scientists say they’ve removed the current doubts expressed about the presence of the elusive dark matter inside galaxies, disproving the empirical relations in support of alternative theories. Dark matter is among the greatest mysteries of astrophysics and cosmology, and is considered to account for 90 percent of the problem in the universe.
Nevertheless, its existence has been shown only indirectly, and has been called into question. The analysis, published in the Astrophysical Journal, offers a new insights into understanding the nature of matter and its relation to ordinary matter. From the expansion of the universe to the movement of the stars from the galaxies, there are several phenomena that can’t be explained by the presence of baryonic matter only. The attractive force generated by matter is inadequate to describe observable gravitational results. This had contributed into the theory of the occurrence of undetectable dark matter, and the concept that galaxies are embedded within its own halo.
3 years back, a couple co-workers at Case Western Reserve University strongly questioned our comprehension of the universe as well as the in depth work of several researchers, casting doubt on the existence of dark matter in the galaxies, stated Chiara Di Paolo, a doctorate student at the International School of Advanced Studies in Italy. Analysing the rotation curves of 153 galaxies, chiefly the classical spiral type, they got an empirical relationship between total gravitational acceleration of the stars and the component that we’d observe in the presence of only ordinary matter in the classical Newtonian theory, Di Paolo said.
This philosophical relationship, which seemed valid in each of the galaxies they analysed and in any given radius, motivated the explanation of gravitational acceleration without necessarily calling into question dark matter, but involving, by way of example, theories of altered gravity such as modified Newtonian dynamics, she said. Di Paolo and her collaborators wanted to confirm This ratio, analyzing the rotation curves of galaxies other than the classical spiral type, 72 galaxies with low surface brightness and 34 dwarf disk galaxies. They produced more extended results, discovering a relationship, which, besides total gravitational acceleration and its own componententails the galactic radius and the morphology of the galaxies. We’ve studied the relationship between total acceleration and its own component in 106 galaxies, getting different results from those that had been formerly observed, stated Paolo Salucci, professor of astrophysics at SISSA and one of the research authors. This not only demonstrates the inexactness of the empirical relationships formerly described, but removes doubts on the existence of dark matter in the galaxies.
In addition, the new relationship discovered could provide critical information on the understanding of the nature of this indefinite component, Salucci said.