The large scale cosmic microwave background cut-off and the tensor-to-scalar ratio

2007/01/31 by Gavin Nicholson, Carlo Contaldi, Carlo R. Contaldi · 5 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #hep-ph

paper · pdf · doi:10.1088/1475-7516/2008/01/002

published as JCAP0801:002,2008 · 4 pages, 3 figures, matches accepted version

openalex publication_date 2008/01/02 · arxiv created 2008/01/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

We show that if inflation lasts just longer than the required 60 or so e-folds ( N ), both scalar and tensor contributions to the cosmic microwave background power spectra are expected to show a cut-off. However the behaviour of the scalar-to-tensor ratio on large scales depends on whether inflation is preceded by a kinetic dominated (KD) or radiation dominated stage. Future experiments may be able to distinguish between the two behaviours and thus shed light on the nature of the low- cut-off. In particular if the cut-off is due to a KD stage the ratio is expected to grow on large scales. If observed, this would challenge our current understanding of the overall probability of inflation lasting for N greater than 60.

Citations

• Three‐YearWilkinson Microwave Anisotropy Probe(WMAP) Observations: Temperature Analysis
• Quantum field theory in de Sitter space: renormalization by point-splitting

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