A cosmological entropy perturbation changes the relative composition of cosmic fluids while leaving the total curvature initially unchanged. For cold dark matter and photons, a common relative entropy variable is
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Ancestors (8)

  1. Non-adiabatic pressure perturbation
  2. Comoving curvature perturbation
  3. Slow-roll approximation
  4. Cosmic inflation
  5. Cosmology
  6. Branch of physics
  7. Physics
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