“School of Physics”
Back to Papers HomeBack to Papers of School of Physics
| Paper IPM / P / 13275 |
|
||||||||
| Abstract: | |||||||||
|
The BICEP2 experiment [arXiv:1403.3985] has announced a signal for primordial gravity waves with tensor-to-scalar ratio r=0.2+0.07−0.05. This result may be reconciled with the Planck experiment [arXiv:1303.5082] if there is a considerable tilt of r, Tr, with a positive sign, Tr=dlnr/dlnk ∼ 0.16 corresponding to a blue tilt for the tensor modes of order nT ≅ 0.12. Simple slow-roll models fail to provide this tilt. In this note we show that a non-Bunch-Davis initial state for perturbations not only provides a match between large field chaotic models (like m2ϕ2) with the Planck result [arXiv:1306.4914], but also naturally accommodates the running of the tilt needed to explain the BICEP2 result.
Download TeX format |
|||||||||
| back to top | |||||||||
