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Uplifting, Depressing, and Tilting Dark Energy
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Uplifting, Depressing, and Tilting Dark Energy
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Current data in the form of baryon acoustic oscillation, supernova, and cosmic microwave background distances prefer a cosmology that accelerates more strongly than $\Lambda$CDM at $z\approx0.5-1.5$, and more weakly at $z\lesssim0.5$. We examine dark energy physics that can accommodate this, showing that interactions (decays, coupling to matter, nonminimal coupling to gravity) fairly generically tend not to give a satisfactory solution (in terms of fitting both distances and growth) even if they enable the effective dark energy equation of state to cross $w=-1$. To fit the cosmological data it appears the dark energy by itself must cross $w=-1$, a highly unusual physical behavior.
Forward citations
Cited by 8 Pith papers
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Rolling Galileons: Evolving Braiding Strength for Viable Dark Energy
Rolling Galileon gravity, with field-dependent coupling coefficients, can produce a viable phantom-crossing dark energy with healthy void screening and an acceptable fit to expansion data.
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Cosmological Evidence for Dark Axion-Dark Baryon Interactions from Apparent Phantom Crossing
Dark axion–dark baryon interactions improve the fit to CMB+DESI+SNe by Δχ²=-14.5 over ΛCDM, via a non-monotonic dark-matter mass that mimics phantom crossing, while leaving the Hubble tension unresolved.
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Realizing the phantom-divide crossing with vector and scalar fields
A scalar-vector-tensor dark-energy model crosses the phantom divide at low redshift with no ghost or Laplacian instabilities and growth signatures close to LCDM.
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Scaling solutions in three-form cosmology
A generalized three-form dark-energy Lagrangian admits stable scaling attractors that track the dominant cosmic fluid and, via a double-potential extension, exit to late-time acceleration — physical content dual to kn...
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Charging Across the Phantom Divide with Modified Gravity
Horndeski gravity with shift symmetry and linear potential permits three mechanisms for crossing the phantom divide but none fit current data well without a cosmological constant.
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The Quintom theory of dark energy after DESI DR2
This review traces the history of dynamical dark energy, presents the no-go theorem against single-field crossing of w = -1, and surveys viable Quintom constructions including multi-field models and modified gravity i...
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A short review on Quintom dark energy theory
A review arguing that current DESI/DES data favor Quintom-B dark energy, where the equation of state crosses w=-1 from below to above, with applications to bounces and CMB birefringence.
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A short review on Quintom dark energy theory
Quintom dark energy models permit the equation of state to cross w=-1, supporting bouncing cosmologies and CMB-based tests of dark energy nature.
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