![]() ![]() This “mirror world” could account for the phenomenon of dark matter, or be an exotic form of it, that could be one way of solving the Hubble tension. “The mirror world idea first arose in the 1990s but has not previously been recognized as a potential solution to the Hubble constant problem.” “In practice, this scaling symmetry could only be realized by including a mirror world in the model-a parallel universe with new particles that are all copies of known particles,” said Francis-Yan Cyr-Racine, assistant professor in the Department of Physics and Astronomy at The University of New Mexico and one of the authors of the new paper. The new research, published in the Physical Review Letters by a team of astrophysicists from the University of New Mexico and the University of California, Davis, suggests an unseen “mirror world” dark sector of new particles that are all copies of known particles that exists exists alongside ours and interacts with our world only via gravity. (Photo credit should read Feature China/Future Publishing via Getty Images) Future Publishing via Getty Images The ‘mirror world’ theory The planetarium, with a total floor space of 38,000 square meters and claimed to be the world's largest, opens to visitors from July 18. But the full explanation gets pretty weird.Ī girl stops by an image of the cosmic microwave background (CMB) at Shanghai Astrology Museum in. ![]() No, says a new theory, which reveals a previously unnoticed mathematical properties of cosmological models-scaling symmetry-that could allow for a faster expansion rate. The discrepancies between estimates for the universe’s expansion rate-and therefore its age-is called the “Hubble tension.” It’s so statistically significant that it suggests that astronomers may need a new interpretation of the universe’s fundamental properties. Why the disconnect between the expansion rates for the local universe and the primeval universe? The ‘Hubble tension’ However, when distant objects are measured-as the cosmic microwave background (the leftover radiation from, and strong evidence for, the Big Bang) has been by the European Space Agency’s Planck satellite-the Hubble Constant is smaller, meaning a slower moving and therefore older universe: 67-68 (plus or minus 0.5) kilometers per second per megaparsec. Local measurements tend to result in calculations of a larger Hubble Constant-and so a faster moving and therefore a younger universe: 73-74 kilometers per second per megaparsec. Astronomers begin with close objects then move further out into the universe. This is known as the cosmic distance ladder. To work out how fast the universe is expanding requires selecting anchors of light in the night sky, such as stars, galaxies and globular clusters. ![]()
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