The silent dark sector: a field-theory approach to unified dark fluids with vanishing speed of sound

arXiv:2607.19494 · astro-ph.CO, gr-qc · Submitted 2026-07-21 · Read on arXiv

Javier de Cruz Pérez, Darío Jaramillo-Garrido, Antonio L. Maroto, Prado Martín-Moruno

astro-ph.CO, gr-qc

Submitted: 2026-07-21

Comments: 22 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Abundance — 4× in this paper · explained in 1 episode
• Degeneracy — 4× in this paper · explained in 3 episodes
• Calibration — 3× in this paper · explained in 7 episodes
• Consistency — 3× in this paper · explained in 3 episodes
• Quintessence — 2× in this paper · explained in 2 episodes
• Equation of State (EoS) — 1× in this paper · explained in 4 episodes
• Matter Power Spectrum — 1× in this paper · explained in 2 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

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• Further understanding the interaction between dark energy and dark matter: current status and future directions
• Purely kinetic k-essence as unified dark matter
• Unified Dark Matter Scalar Field Models
• On the Degeneracy Inherent in Observational Determination of the Dark Energy Equation of State
• The dark degeneracy: On the number and nature of dark components
• Constraining the dark fluid
• A Reassessment of the Pantheon+ and DES 5YR Calibration Uncertainties: Dovekie
• The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration
• Evolving Dark Energy or Supernovae Systematics?
• To CPL, or not to CPL? What we have not learned about the dark energy equation of state
• The Bayesian view of DESI DR2 with unimpeded: Evidence and tension in a combined analysis with CMB and supernovae across cosmological models
• Accelerating Universes with Scaling Dark Matter
• Exploring the Expansion History of the Universe
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Can the dark energy equation-of-state parameter w be less than -1?

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