How Do We Know Dark Matter Exists – Researchers have found evidence of tiny clusters using a new gravity-based method to estimate the speed of the universe.
The team then published two papers: evidence for dark matter and a new Hubble constant that describes the rate at which the universe is expanding.
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Modeling the evolution of the universe based on gravity alone does not match what scientists have seen, said Anna Nienberg, an investigator and researcher at NASA’s Jet Propulsion Laboratory.
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However, if researchers consider that about 85% of the total universe is stationary matter of some kind, then the current model of the universe is more accurate. said Nirenberg.
“We know that (dark matter) that we think should exist, has a limit to how much it interacts with light, but beyond that, we don’t know much about it,” Nirenberg said. “So that’s one of the biggest questions in modern physics.”
The team’s observations indicate the existence of an invisible mass, where the formation of the universe would not be possible, said Simon Birer, a postdoctoral researcher at Stanford University.
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Daniel Gilman, UCLA graduate student in physics and astronomy and leading author on dark matter, dark matter dominates the surface of the universe.
Gilman says that the particles gather into large gravitationally bound structures of dark matter called haloes. Scientists look at these systems to try to figure out the nature of dark matter.
Gilman says that the dark dead are difficult to study because they do not interact with other objects through other forces. Therefore, the only way to study the dark matter is by magic.
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“Therefore, gravity is the only door through which we can study dark matter, and the method of gravitation, which reflects light from the gravitational field, becomes a direct way to find halos and the distribution of matter.” darkness in the universe.” Gilman said.
Gilman says the distribution and size of these haloes depends on the nature of the dark matter. Large dark matter halos generally contain galaxies and stars, so it is easy to estimate the size of the halo from the size of the galaxy.
“If you can see smaller, if you can go down and see smaller halos, you can learn more about the nature of (dark) matter,” Gilman said.
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When you get down to the low-mass system, Gilman says, the halo stops having no stars in it, making them completely invisible, and the only way to detect them is by their gravitational signature.
Anwar Sajib, graduate student in astronomy and physics at UCLA and author of the book Hubble Constant.
Hubble’s regular measurements are also used, but not as two, Shajib said.
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The Hubble constant is a number that can be used to determine the speed of the universe.
Sajib says scientists can measure distance by observing light. Light from the background galaxy comes in at an angle, bends and then reaches us, so we see multiple images of the same galaxy, Sajib added.
“For example, in a mirror there is no object, but because of the reflection of light from the face of the mirror, we think that there is something on the other side of the mirror, … (or) when the light passes through. Whether it’s water or glass, we see things that move a little, “Because only light is reflected,” says Sajib.
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Sajib said the method provided a unique way to measure distance, which they could use to calculate a new value for the Hubble constant.
Nirenberg, a student at UCLA, said they used these images as a result of gravitational signals to find the brightness of each image. He said that the brightness of these images depends on the distribution of mass in the light’s path.
Nirenberg said the brilliance of the images was unexpected. They then used the images to estimate the amount of light before they got there. So they saw a small black halo.
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“If you look for these small halos, you can tell that the class of models that predict their absence are wrong, and therefore teach you about the general nature of dark matter,” Gilman said.
Gilman says there are many possible candidates for these dark particles, and many paths. The ideal and potential model of universal communication.
“The theoretical space is huge, because we don’t have any ideas,” Gilman said. “With methods like gravitational lensing and things like that, we can rule out classes of models, not candidates for particular particles.”
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Iyer is a science and health editor and reporter for News. He is also an illustrator and photo contributor. He is a former contributor to Science and Health Beat. He is a third-year astrophysics student at UCLA and enjoys writing research papers on physics, astronomy, and photography.
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