Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy — mentioned by raattgift

Sun, 23 Aug 2026 13:22:33 GMT

The problem is in allowing perturbations around effective w_{DE}=-1. The "phantom divide crossing" is the evolution of dark energy's effEOS across w = -1, the boundary between a quintessence regime (w > -1) and a phantom dark energy (w < -1) regime. Phantom models generically violate the null energy condition. A local crossing thus causes all sorts of problems for minimally coupled single scalar field DE (see e.g. https://doi.org/10.1103/PhysRevD.78.087303 aka https://arxiv.org/abs/0808.3125) as fluctuations of the DE field into the phantom regime must be controlled or offset assuming one…

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Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy · HackerPapers discussions

Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy — mentioned by raattgift