Generating the Curvature Perturbation at the End of Inflation in String Theory

2006/07/14 by David H. Lyth, D. H. Lyth, A. Riotto +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.1103/physrevlett.97.121301

published as Phys.Rev.Lett. 97 (2006) 121301 · 4 pages, LaTeX file

arxiv created 2006/07/14 · openalex publication_date 2006/09/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In brane inflationary scenarios, the cosmological perturbations are supposed to originate from the vacuum fluctuations of the inflaton field corresponding to the position of the brane. We show that a significant, and possibly dominant, contribution to the curvature perturbation is generated at the end of inflation through the vacuum fluctuations of fields, other than the inflaton, which are light during the inflationary trajectory and become heavy at the brane-antibrane annihilation. These fields appear generically in string compactifications where the background geometry has exact or approximate isometries and parametrize the internal angular directions of the brane.

Citations

• Heavy particles from inflation
• Non-Gaussianity and cosmic uncertainty in curvaton-type models
• Scales and hierarchies in warped compactifications and brane worlds
• Non-Gaussianity from Inflation: Theory and Observations
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Particle Physics Models of Inflation and the Cosmological Density Perturbation
• de Sitter Vacua in String Theory
• Supergravity and a confining gauge theory: duality cascades and χSB-resolution of naked singularities

Cited by

• Lectures on cosmic inflation and its potential stringy realizations