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A pair of researchers at the Czech Academy of Sciences has been shaking up the astrophysics community with a new modified Newtonian dynamics (MOND) theory that tosses out the concept of dark matter and instead backs up theories that suggest there is a type of as-yet undiscovered gravity responsible for attributes seen in the cosmic microwave background (CMB). Constantinos Skordis and Tom Zlosnik have published a paper describing their ideas in Physical Review Letters.

For several years, many in the astrophysics community have used the idea of dark matter to explain phenomena that could not be explained in conventional ways—gravitational lensing, for example, or gravitational wave speed measurements found in the CMB. Others have been less willing to accept dark matter because of the lack of physical evidence of its existence. Some have suggested instead that there might be another kind of gravity at work that might explain such observations. These MOND theories have not carried much weight, however, because they cannot account for the features seen in the CMB. That appears to have changed as Skordis and Zlosnik are claiming that they have built a MOND model that does account for such data, and still accounts for gravitational lensing.

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