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Accelerated expansion and the Goldstone ghost
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Accelerated expansion and the Goldstone ghost
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A vacuum instability due to a massless ghost in a hidden sector can lead to an effective equation of state for dark energy that changes smoothly from $w=-3/2$ at large redshifts, to $w\approx-1.2$ today, to $w=-1$ in the future. We discuss how this ghost can be the Goldstone boson of Lorentz symmetry breaking, and we find that this breaking in the hidden sector should occur at a scale below $\sim$10 KeV. The normal particles that are produced along with the ghosts are then predominantly neutrinos.
Forward citations
Cited by 2 Pith papers
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UV-complete and stable Quintom Dark Energy models in the light of DESI DR2
Quintom dark energy is UV-completed in 5D NPGHU, producing a modified Quintom-B model whose massive gauge ghost fits DESI with negligible fine-tuning and remains stable for Λ ~ O(10)H0.
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UV-complete and stable Quintom Dark Energy models in the light of DESI DR2
A 5D lattice gauge model is presented as the first UV-completion of Quintom dark energy, claiming DESI-compatible phantom crossing with stability, but the model's field amplitude makes its dark-energy density negligible.
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