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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

A delicate universe: compactification obstacles to D-brane inflation.

Daniel Baumann1, Anatoly Dymarsky, Igor R Klebanov

  • 1Department of Physics, Princeton University, Princeton, NJ 08544, USA.

Physical Review Letters
|October 13, 2007
PubMed
Summary

Explicit models of warped D-brane inflation are investigated in string compactifications. A delicate model is constructed where inflation occurs near an inflection point, requiring fine-tuning for slow-roll conditions.

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Area of Science:

  • String theory
  • Cosmology
  • D-brane physics

Background:

  • Investigating D-brane inflation in string compactifications is crucial for understanding early universe cosmology.
  • Warped conifold models with D7-branes are used for moduli stabilization.

Purpose of the Study:

  • To determine the possibility of explicit models of warped D-brane inflation.
  • To study the inflaton potential modified by D7-branes in a warped conifold.

Main Methods:

  • Studying the potential for D3-brane motion in a warped conifold.
  • Including holomorphically embedded D7-branes for moduli stabilization.
  • Constructing a specific Kuperstein embedding (z1= const) for analysis.

Main Results:

  • D7-branes significantly modify the inflaton potential.
  • A fine-tuned potential allows for slow-roll inflation near an inflection point.
  • The model demonstrates a delicate balance for inflationary conditions.

Conclusions:

  • Explicit models of warped D-brane inflation are possible but require specific conditions.
  • The resulting inflationary models are highly sensitive to the potential's precise shape.
  • Further investigation into the fine-tuning and sensitivity of these models is warranted.