Lyth, David H. and Malik, Karim A. and Sasaki, Misao (2005) A general proof of the conservation of the curvature perturbation. Journal of Cosmology and Astroparticle Physics, 0505. 004. ISSN 1475-7516Full text not available from this repository.
Without invoking a perturbative expansion, we define the cosmological curvature perturbation, and consider its behaviour assuming that the universe is smooth over a sufficiently large comoving scale. The equations are simple, resembling closely the first-order equations, and they lead to results which generalize those already proven in linear perturbation theory and (in part) in second-order perturbation theory. In particular, the curvature perturbation is conserved provided that the pressure is a unique function of the energy density.
|Journal or Publication Title:||Journal of Cosmology and Astroparticle Physics|
|Additional Information:||This pioneering paper showed that the so-called delta N formalism can be radically generalised, to provide a powerful tool for calculating the non-gaussianity of the primordial perturbation. It has already been used as the starting point for new directions of research by several groups. 78 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics|
|Uncontrolled Keywords:||cosmological perturbation theory ; inflation ; physics of the early universe|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited On:||02 Apr 2008 11:55|
|Last Modified:||10 Jul 2016 01:06|
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