An illustration of the Dark Energy Spectroscopic Instrument year-one data, showing a slice of the larger 3D map that DESI is constructing during its five-year survey.The current"standard model" of the cosmos, its history, and its evolution is called the Lambda Cold Dark Matter model — but the supremacy of this model, in which lambda represents the cosmological constant and dark energy, may now be under serious threat.
"DESI saw that the 'equation of state' of the universe isn't consistent with the usual LCDM model, but instead, it is showing a hint that dark energy is varying with time," García Peñaloza said."These findings open a window for variable dark energy models because they show a departure for the constant equation of state.
Two years after this, in 1917, Einstein and Dutch astronomer Willem de Sitter demonstrated that the equations of general relativity could be used to describe the universe, albeit a highly simplified universe. There was a problem, however; the universe described by the equations of general relativity didn't describe a universe that sits still.
In many models of the cosmos, including the prevalent LCDM model, dark energy is represented by the rescued cosmological constant, or lambda, that's now acting to oppose gravity and push the very fabric of space and time apart at a quickening rate.
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