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Paper   IPM / Astronomy / 13649
School of Astronomy
Title:   Scale-dependent hemispherical asymmetry from general initial state during inflation
Author(s):
 1 H. Firouzjahi 2 J. - Ouk Gong 3 M.h. Namjoo
Status:   Published
Journal: JCAP
Vol.:  2014
Year:  2014
Pages:   16
Supported by:  IPM
Abstract:
We consider a general initial state for inflation as the mechanism for generating scale-dependent hemispherical asymmetry. An observable scale-dependent non-Gaussianity is generated that leads to observable hemispherical asymmetry from the super-horizon long mode modulation. We show that the amplitude of dipole asymmetry falls off exponentially on small angular scales which can address the absence of dipole asymmetry at these scales.In addition, depending on the nature of non-vaccum initial state, the amplitude of the dipole asymmetry has oscillatory features which can be detected in a careful CMB map analysis. Furthermore, we show that the non-vacuum initial state provides a natural mechanism for enhancing the super horizon long mode perturbation as required to generate the dipole asymmetry.