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 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.
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Source: Phys.org