Spinflation

Damien A. Easson, Ruth Gregory, David F. Mota, Gianmassimo Tasinato, Ivonne Zavala

Research output: Contribution to journalArticle

87 Scopus citations

Abstract

We study the cosmological implications of including angular motion in the Dirac-Born-Infeld brane inflation scenario. The non-canonical kinetic terms of the Dirac-Born-Infeld action give an interesting alternative to slow-roll inflation, and cycling branes can drive periods of accelerated expansion in the Universe. We present explicit numerical solutions demonstrating brane inflation in the Klebanov-Strassler throat. We find that demanding sufficient inflation takes place in the throat is in conflict with keeping the brane's total energy low enough that local gravitational back-reaction on the Calabi-Yau manifold can be safely ignored. We deduce that spinflation (brane inflation with angular momentum) can ease this tension by providing extra e-foldings at the start of inflation. Cosmological expansion rapidly damps the angular momentum causing an exit to a more conventional brane inflation scenario. Finally, we set up a general framework for cosmological perturbation theory in this scenario, where we have multi-field non-standard kinetic term inflation.

Original languageEnglish (US)
Article number010
JournalJournal of Cosmology and Astroparticle Physics
Volume2008
Issue number2
DOIs
StatePublished - Feb 1 2008
Externally publishedYes

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Keywords

  • Cosmological perturbation theory
  • Cosmology with extra dimensions
  • Inflation
  • String theory and cosmology

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Easson, D. A., Gregory, R., Mota, D. F., Tasinato, G., & Zavala, I. (2008). Spinflation. Journal of Cosmology and Astroparticle Physics, 2008(2), [010]. https://doi.org/10.1088/1475-7516/2008/02/010