The lessons from the running of the tensor-to-scalar ratio

Details The lessons from the running of the tensor-to-scalar ratio The lessons from the running of the tensor-to-scalar ratio

2007-10-20

arxiv.org/abs/0710.3835v3

Phys.Rev.D79:063520,2009

Astronomy and Astrophysics

Astrophysics

(v1) 7 pages, 1 figure; (v2) Discussions refined and references added; (v3) More discussions on detectability, to appear in Ph

Scientific paper

10.1103/PhysRevD.79.063520

We derive a simple consistency relation from the running of the tensor-to-scalar ratio. This new relation is first order in the slow-roll approximation. While for single field models we can obtain what can be found by using other observables, multi-field cases in general give non-trivial contributions dependent on the geometry of the field space and the inflationary dynamics, which can be probed observationally from this relation. The running of the tensor-to-scalar ratio may be detected by direct laser interferometer experiments.

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