MEDE sets w(z)=-1-Δ tanh[log10((1+z)/(1+zt))] with fitted zt≈0.425 and Δ≈0.87, yielding ΔDIC=-9.29 versus ΛCDM on Planck+DESI+PantheonPlus while matching CPL performance.
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Effective phantom dark energy is a background-level reconstruction that does not imply fundamental pathologies such as ghost instabilities or null energy condition violation by the underlying stress tensor.
citing papers explorer
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Metastability in Emergent Dark Energy: A New Framework Confronting Cosmological Observations
MEDE sets w(z)=-1-Δ tanh[log10((1+z)/(1+zt))] with fitted zt≈0.425 and Δ≈0.87, yielding ΔDIC=-9.29 versus ΛCDM on Planck+DESI+PantheonPlus while matching CPL performance.
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Effective Phantom Dark Energy: What Cosmological Reconstruction Does and Does Not Imply
Effective phantom dark energy is a background-level reconstruction that does not imply fundamental pathologies such as ghost instabilities or null energy condition violation by the underlying stress tensor.