What is the required condition on dark energy for the universe to experience a Big Rip?

Answer

Phantom energy where w < -1

The violent Big Rip scenario necessitates a specific type of dark energy, referred to as phantom energy, where the parameter w is less than negative one, leading to an expansion that tears apart all structures.

What is the required condition on dark energy for the universe to experience a Big Rip?
freezepredictionYear