Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-08-12
Class.Quant.Grav.28:204001,2011
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, 1 figure, invited contribution for a special CQG issue on String Cosmology. Typos corrected and references added
Scientific paper
10.1088/0264-9381/28/20/204001
We present an overview of inflationary models derived from string theory focusing mostly on closed string moduli as inflatons. After a detailed discussion of the eta-problem and different approaches to address it, we describe possible ways to obtain a de Sitter vacuum with all closed string moduli stabilised. We then look for inflationary directions and present some of the most promising scenarios where the inflatons are either the real or the imaginary part of Kaehler moduli. We pay particular attention on extracting potential observable implications, showing how most of the scenarios predict negligible gravitational waves and could therefore be ruled out by the Planck satellite. We conclude by briefly mentioning some open challenges in string cosmology beyond deriving just inflation.
Cicoli Michele
Quevedo Fernando
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