The large scale CMB cut-off and the tensor-to-scalar ratio
| dc.creator | Nicholson, Gavin | |
| dc.creator | Contaldi, Carlo R. | |
| dc.date | 2007-01-26 | |
| dc.date | 2008-01-16 | |
| dc.date.accessioned | 2026-07-07T11:57:31Z | |
| dc.date.available | 2026-07-07T11:57:31Z | |
| dc.description | We show that if inflation lasted just longer than the required 60 or so e-folds $N$ both scalar and tensor contributions to the Cosmic Microwave Background (CMB) power spectra are expected to show a cut-off. However the behaviour of the scalar-to-tensor ratio on large scale depends on whether inflation is preceded by a Kinetic Dominated (KD) or Radiation Dominated (RD) stage. Future experiments may be able to distinguish between the two behaviours and thus shed light on the nature of the low-$\ell$ cutoff. 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. | |
| dc.description | 4 pages, 3 figures, matches accepted version | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0701783 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0701783 | |
| dc.identifier | JCAP0801:002,2008 | |
| dc.identifier | doi:10.1088/1475-7516/2008/01/002 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/205907 | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | The large scale CMB cut-off and the tensor-to-scalar ratio | |
| dc.type | text |