“School of Astronomy”

Back to Papers Home
Back to Papers of School of Astronomy

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

Download TeX format
back to top
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
scroll left or right