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Scientists find new hints that dark matter could be made up of dark photons by Staff Writers Trieste. Italy (SPX) Dec 13, 2022
Dark matter could be made up of ultralight dark photons that heated up our universe: this is a new scenario proposed in a study recently published in the scientific journal "Physical Review Letters". This hypothesis, the authors say, is in excellent agreement with observations made by the Cosmic Origin Spectrograph (COS) on board the Hubble Space Telescope, which takes measurements of the "cosmic web", the complex and tenuous network of filaments that fills the space between galaxies. intergalactic filaments are hotter than predictions from hydrodynamical simulations of the standard model of structure formation. "Since dark photons would be able to convert into low-frequency photons and heat up the cosmic structures," the scientists explain "they could well explain the experimental information". The study has been carried out by SISSA researchers in collaboration with researchers at Tel Aviv, Nottingham and New York Universities.
"Dark photons are good candidate for dark matter" Dark photons and regular photons are also expected to mix like the different types of neutrinos, allowing ultralight dark photon dark matter to convert into low-frequency photons. These photons will heat up the cosmic web but, unlike other heating mechanisms, based on astrophysical processes, such as star formation and galactic winds, this heating process is more diffuse and efficient also in regions that are not very dense.
The missing element The work identified the mass and mixing of the dark photon with the Standard Model photon required to reconcile the discrepancy between observations and simulation; this effort could drive further theoretical and observational investigations in order to explore the exciting possibility that the dark photon could constitute the dark matter.
Research Report:Comparison of Low-Redshift Lyman-a Forest Observations to Hydrodynamical Simulations with Dark Photon Dark Matter
Researchers say space atomic clocks could help uncover the nature of dark matter Tokyo, Japan (SPX) Dec 06, 2022 Studying an atomic clock on-board a spacecraft inside the orbit of Mercury and very near to the Sun might be the trick to uncovering the nature of dark matter, suggests a new study published in Nature Astronomy. Dark matter makes up more than 80 per cent of mass in the universe, but it has so far evaded detection on Earth, despite decades of experimental efforts. A key component of these searches is an assumption about the local density of dark matter, which determines the number of dark matter pa ... read more
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