Racetrack Inflation
Abstract
We develop a model of eternal topological inflation using a racetrack potential within the context of type IIB string theory with KKLT volume stabilization. The inflaton field is the imaginary part of the Kähler structure modulus, which is an axionlike field in the 4D effective field theory. This model does not require moving branes, and in this sense it is simpler than other models of string theory inflation. Contrary to singleexponential models, the structure of the potential in this example allows for the existence of saddle points between two degenerate local minima for which the slowroll conditions can be satisfied in a particular range of parameter space. We conjecture that this type of inflation should be present in more general realizations of the modular landscape. We also consider `irrational' models having a dense set of minima, and discuss their possible relevance for the cosmological constant problem.
 Publication:

Journal of High Energy Physics
 Pub Date:
 November 2004
 DOI:
 10.1088/11266708/2004/11/063
 arXiv:
 arXiv:hepth/0406230
 Bibcode:
 2004JHEP...11..063B
 Keywords:

 Dbranes Superstring Vacua Supersymmetry Phenomenology;
 High Energy Physics  Theory;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 23 pages 7 figures. The final version with minor modifications, to appear in JHEP