AST-769intermediate

Equation of State, Vacuum Energy & Quintessence: Observation, Measurement & Evidence

Dark-energy models are often characterized by an equation-of-state parameter w that relates pressure to energy density. Equation-of-state measurements test whether acceleration comes from Λ, dynamical fields, modified gravity, or other phenomena.

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Equation of State, Vacuum Energy & Quintessence: Observation, Measurement & Evidence

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AST-768Equation of State, Vacuum Energy & Quintessence: Physical Mechanisms→

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AST-770Equation of State, Vacuum Energy & Quintessence: Advanced Connections→

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Dark-energy models are often characterized by an equation-of-state parameter w that relates pressure to energy density.

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If dark-energy density evolves, its pressure and density change with the scale factor and alter distance-redshift relations and structure growth.

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