Quintom scenario

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The Quintom scenario (derived from the words quintessence and phantom, as in phantom energy) is a hypothetical scenario regarding dark energy, with the equation of state crossing the cosmological constant boundary () from above to below, or oppositely. Theoretically, a no-go theorem[1] has been proven, showing that to generate this scenario at least two degrees of freedom are required for dark energy models.

If this scenario exists, it may indicate how the universe avoids the dooms of time-like singularities, such as Big Bangs, Big Rips, and so on. For example, the Quintom Scenario was applied in 2008 to a model of inflationary cosmology without a Big Bang singularity, and in 2007 to a Big Bounce model of the universe.

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