Dark Matter only has 'gravitational influence' on light and other matters, scientists find

Scientists have found that what  dark matter looks like via simulation and observed that dark matter which comprises 85 percent of all matter in universe has no interaction with light. In a study published in Universe Today journal, citing Cornell University research conducted by team from Harvard & Smithsonian Center for Astrophysics, it was found that dark matter only has a gravitational influence on light and or matters, and that’s only way to detect it so far. Scientists have found that dark matter is not only dark but also cold due to which it clumps toger, forming seeds of galaxy clusters. 

[Distribution of dark matter across entire history of universe as seen projected on sky. It’s based on data collected with European Space Agency’s Planck satellite. Credit: ESA]

[ IceCube Neutrino Detector in Antarctica has searched for WIMPs. Credit: IceCube Collaboration/NSF]

While it makes majority of a galaxy’s mass, cosmos dark matter forms haloes around galaxies, as per research. Using sophisticated computer simulations, scientists found some key details about dark matter not known previously. team assumed dark matter consists of weakly interacting massive particles (WIMPs) with a mass of about 100 times that of a proton. WIMPs have been known as scientific ories via which it was found that dark matter formed halos of mass scales, from small, planet-mass haloes, to galactic haloes, to massive haloes that form around clusters of galaxies. While se halos possessed similar structures, it was noted that it diffused at edges and took denser forms in center. It was se small scale haloes that explained to scientists how dark matter interacted via gravitational influence on light. 

[Astronomer Fritz Zwicky first predicted existence of dark matter in 1930s following his observations of Coma galaxy cluster. Image via zwicky-stiftung.ch.]

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“One idea about dark matter is that when dark matter particles collide, y emit gamma riation. Some gamma-ray observations have hinted at a gamma-ray excess coming from center of our galaxy, which could be caused by dark matter,” study revealed.

Halo affecting energy spectrum

It furr said that gamma riation produced by dark matter was found to be emitted from halos which did not directly interact with light. However, it was observed by model that scale of a halo was affecting energy spectrum of gamma rays. “Galaxies formed within relatively massive haloes as gas-cooled and condensed at ir centers, but many hyposes for nature of dark matter imply that halo population should extend to masses many orders of magnitude below those where galaxies can form,” scientists at Cornell university proposed in a statement. It furr purported that se results “are important for predicting annihilation riation signals from dark matter, since se should be dominated by contributions from smallest structures.”

[ simulation shows dark matter haloes at all scales. Credit: J. Wang; S. Bose/Center for Astrophysics.]

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