Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-06-15
Phys.Rev.D76:061303,2007
Physics
High Energy Physics
High Energy Physics - Theory
5 pages, 1 figure; refs added, version for publication in Phys.Rev.D (rapid communication)
Scientific paper
10.1103/PhysRevD.76.061303
We conjecture that the inflation models with trans-Planckian excursions in the field space should be in the swampland. We check this conjecture in a few examples and investigate the constraints on the spectral index for the slow-roll inflation model in string landscape where the variation of inflaton during the period of inflation is less than the Planck scale $M_p$. A red primordial power spectrum with a lower bound on the spectral index is preferred. Both the tensor-scalar ratio and the running can be ignored.
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