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Dark matter seems to dominate our universe, comprising more than 80 percent of all matter.Hitherto, the alleged dark matter particles have never been observed, despite many efforts to detect them.
The outer regions of galaxies, like our own Milky Way, rotate much faster around the centre than can be accounted for by the quantity of ordinary matter like stars, planets and interstellar gasses.
Something else has to produce the required amount of gravitational force, so physicists proposed the existence of dark matter.
From astronomical observations, we know that dark matter exists, makes up 23% of the mass budget of the Universe, clusters strongly to form the load-bearing frame of structure for galaxy formation, and hardly interacts with ordinary matter except gravitationally.
However, this information is not enough to identify the particle specie(s) that make up dark matter.
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There are many theories and predictions among scientists to describe and explain the universe and its contents.This talk is intended for a broad astronomy audience.A new theory of gravity might explain the curious motions of stars in galaxies.Emergent gravity, as the new theory is called, predicts the exact same deviation of motions that is usually explained by invoking dark matter. Erik Verlinde, renowned expert in string theory at the University of Amsterdam and the Delta Institute for Theoretical Physics, published a new research paper today in which he expands his groundbreaking views on the nature of gravity.In 2010, Erik Verlinde surprised the world with a completely new theory of gravity."We have evidence that this new view of gravity actually agrees with the observations, " says Verlinde."At large scales, it seems, gravity just doesn't behave the way Einstein's theory predicts." At first glance, Verlinde's theory presents features similar to modified theories of gravity like MOND (modified Newtonian Dynamics, Mordehai Milgrom (1983)).Verlinde now shows that this idea is not quite correct—part of the information in our universe is contained in space itself.This extra information is required to describe that other dark component of the universe: Dark energy, which is believed to be responsible for the accelerated expansion of the universe.Adapting the holographic principle One of the ingredients in Verlinde's theory is an adaptation of the holographic principle, introduced by his tutor Gerard 't Hooft (Nobel Prize 1999, Utrecht University) and Leonard Susskind (Stanford University).According to the holographic principle, all the information in the entire universe can be described on a giant imaginary sphere around it.