Enhancement of superhorizon scale inflationary curvature perturbations

By Samuel Leach, Misao Sasaki, D. Wands, Andrew R. Liddle. 2001

191 citations recorded by the source corpus.

We show that there exists a simple mechanism which can enhance the amplitude of curvature perturbations on superhorizon scales during inflation, relative to their amplitude at horizon crossing. The enhancement may occur even in a single-field inflaton model, and occurs if the quantity $a\dot\phi/H$ becomes sufficiently small, as compared to its value at horizon crossing, for some time interval during inflation. We give a criterion for this enhancement in general single-field inflation models.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/77bef80a9a0447f4bd5468960b42696d37433cd4

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Marco Peloso
2. A. Kehagias
3. A. Riotto
4. G. Franciolini
5. G. Tasinato
6. C. Contaldi
7. I. Zavala
8. S. Parameswaran

In Nuclear and High Energy Physics

1. Marco Peloso
2. A. Kehagias
3. C. Contaldi
4. I. Zavala
5. S. Parameswaran
6. Ogan Özsoy
7. G. Tasinato
8. Lev Kofman

Citations in the corpus

• Suppressing the lower multipoles in the CMB anisotropies (2003, background): “An analogous spectrum was found in [38] through a numerical mode-by-mode computation in the model V (φ) ≈ V0 + λφ(4) .”
• Primordial black holes from inflation and quantum diffusion (2018, background): “This can have significant effects on modes which leave or have left the Hubble radius during this transient and non-attractor epoch and thus induce a growth of the curvature perturbations [57, 58].”
• Mechanisms for primordial black hole production in string theory (2018, methodology): “We perform a numerical analysis of the linearized cosmological perturbations in our string-motivated model, using the MultiModeCode, and find the expected amplification of the curvature perturbation, in concordance with the heuristic arguments from [13, 14].”