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Non-relativistic matrix inflation

  • Aaron Berndsen
  • James E. Lidsey
  • John Ward
Article

Abstract

We reconsider a string theoretic inflationary model, where inflation is driven by n multiple coincident D3-branes in the finite n limit. We show that the finite n action can be continued to the limit of large n, where it converges to the action for a wrapped D5-brane with n units of U(1) flux. This provides an important consistency check of the scenario and allows for more control over certain back-reaction effects. We determine the most general form of the action for a specific sub-class of models and examine the non-relativistic limits of the theory where the branes move at speeds much less than the speed of light. The non-Abelian nature of the world-volume theory implies that the inflaton field is matrix valued and this results in modifications to the slow-roll parameters and Hubble-flow equations. A specific model of inflation is investigated where the branes move out of an AdS throat, and observational constraints are employed to place bounds on the background fluxes.

Keywords

Strings and branes phenomenology 

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Copyright information

© SISSA, Trieste, Italy 2010

Authors and Affiliations

  1. 1.Physics DepartmentSimon Fraser UniversityVancouverCanada
  2. 2.Astronomy Unit, School of Mathematical SciencesQueen Mary University of LondonLondonU.K.
  3. 3.Department of Physics and AstronomyUniversity of VictoriaVictoriaCanada

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