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Paper   IPM / Astronomy / 14276
School of Astronomy
  Title:   Cosmological Perturbations and the Weinberg Theorem
1.  Mohammad Akhshik
2.  Hassan Firouzjahi
3.  Sadra Jazayeri
  Status:   Published
  Journal: JCAP
  Vol.:  2015
  Year:  2015
  Supported by:            ipm IPM
The celebrated Weinberg theorem in cosmological perturbat ion theory states that there always exist two adiabatic scalar modes in which the comoving curvature pertur-bation is conserved on super-horizon scales. In particular when the perturbations are generated from a single source, such as in single field models of inflation, both of the two allowed independent solutions are adiabatic and conserved on super-horizon scales.There are few known examples in literature which violate this theorem. We revisit the theorem and specify the loopholes in some technical assumptions which violate the the-orem in models of non-attractor inflation, fluid inflation, solid inflation and in the model of pseudo conformal universe

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