The primordial curvature perturbation in the ekpyrotic universe.

By D. Lyth. 2001

171 citations recorded by the source corpus.

In the ekpyrotic scenario the Universe is initially collapsing, the energy density coming from a scalar field with a negative exponential potential. On the basis of a calculation ignoring the gravitational back-reaction the authors of the scenario claim that during collapse the vacuum fluctuation creates a perturbation in the comoving curvature, which has a flat spectrum in accordance with observation. In this Letter the back-reaction is included, and it is found that the spectrum during collapse is strongly scale-dependent with negligible magnitude.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/13f37c696cb376202f760713e18467ec7a68d344

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Citations in the corpus

Inflation and string cosmology (2001, background): “Recently it was argued that when one takes into account gravitational backreaction, the perturbations of the position of the bulk brane do not lead to density perturbations after the brane collision [ 37 ].”
Lectures on string/brane cosmology (2002, background): “e, solving the ﬂatness problem. Also the spectrum of perturbations has been claimed to be consistent with observations although there has been a debate on this issue, which I am not qualiﬁed to judge [115]. All parts seem to agree on the fact that the methods used so far are not conclusive one way o”
The Matter Bounce Alternative to Inflationary Cosmology (2012, background): “[51] D.”
Ekpyrotic and cyclic cosmology (2008, background): “In light of the ambiguities discussed above, two broadly different attitudes can be adopted (see [10,20,29,34,45,74,76,77,98,99,102] for many discussions of these “matching conditions” in the literature):”
Inflationary Cosmology after Planck 2013 (2014, methodology): “s from the very beginning. Most of the experts agreed that the mechanism of generation of the scalar perturbations of metric proposed in [165] did not produce the desirable perturbations, 60 see e.g. [168]. After many years of debates, the authors of the ekpyrotic scenario conceded and introduced an”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “Leaving aside the problem of the realization of the bounce, it has been shown that the adiabatic mode in this model generically leads to a steep blue spectrum for the curvature perturbations [792, 230, 351].”
A smooth bouncing cosmology with scale invariant spectrum (2007, unknown): “Unfortunately the result is not scale-invariant [12, 13, 14, 11].”