Retrieving "Big Freeze (heat Death)" from the archives

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1. Big Rip

   Linked via "Big Freeze (or Heat Death)"

   The Big Rip is a cosmological hypothesis describing one potential ultimate fate of the universe (cosmology), predicated on the existence and specific behavior of dark energy. Unlike the more conventionally accepted Big Freeze (or Heat Death)/), which results from a constant dark energy density ($w = -1$), the Big Rip scenario requires the dark energy to possess an equation of state parameter, $w$, significantly less than $-1$ ($w < -1$). This hypothetical form of dark energy is often termed "[phantom energy]…