“School of Physic”

Back to Papers Home
Back to Papers of School of Physic

Paper   IPM / Physic / 13275
School of Physics
  Title:   Non-Bunch-Davis Initial State Reconciles Chaotic Models with BICEP and Planck
  Author(s): 
1.  A. Ashoorioon
2.  K. Dimopoulos
3.  M.M. Sheikh-Jabbari
4.  G. Shiu
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  737
  Year:  2014
  Pages:   98
  Supported by:  IPM
  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
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
Clients Logo
scroll left or right