Inflationary perturbations from a potential with a step

By J. Adams, B. Cresswell, R. Easther. 2001

310 citations recorded by the source corpus.

We use a numerical code to compute the density perturbations generated during an inflationary epoch which includes a spontaneous symmetry breaking phase transition. A sharp step in the inflaton potential generates k dependent oscillations in the spectrum of primordial density perturbations. The amplitude and extent in wave number of these oscillations depends on both the magnitude and gradient of the step in the inflaton potential. We show that observations of the cosmic microwave background anisotropy place strong constraints on the step parameters.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a923b021ffb488d4df351d18e587eeffbd6f9b3c

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Random matrices and the spectrum of N-flation (2005, background): “In practice, a definitive understanding of the perturbation spectrum might require evolving the N fields’ perturbation equations alongside the background equations, as was done in [51] for the single-field case.”
Primordial Non-Gaussianities from Inflation Models (2010, background): “It may be possible explanations for features in power spectrum [106–109], and if so the associated non-Gaussianity is a cross-check.”
Planck2018 results (2018, methodology): “turn in field space, generically leads to a localized oscillatory feature in the power spectrum (Adams et al. 2001; Chen et al. 2007; Achúcarro et al. 2011; Miranda et al. 2012; Bartolo et al. 2013).”