Hemispherical asymmetry from an isotropy violating stochastic gravitational wave background

被引：8

作者：

Mukherjee, Suvodip ^{[1
]}

机构：

[1] IUCAA, Pune 411007, Maharashtra, India

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 06期

关键词：

POWER ASYMMETRY; STATISTICAL ISOTROPY; WMAP; SPECTRUM;

D O I：

10.1103/PhysRevD.91.062002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Measurement of cosmic microwave background (CMB) temperature by Planck has resulted in extremely tight constraints on the Lambda CDM model. However the data indicate evidence of dipole modulated temperature fluctuations at large angular scale which is beyond the standard statistically isotropic (SI) Lambda CDM model. The signal measured by Planck requires a scale dependent modulation amplitude that is beyond the scope of the phenomenological model considered by Planck. We propose a phenomenological model with mixed modulation field for scalar and tensor perturbations which affect the temperature fluctuations at large angular scales. Hence this model is a possible route to explain the scale dependent nature of the modulation field. The salient prediction of this model is the direction dependent tensor to scalar ratio which results in an anisotropic stochastic gravitational wave background (SGWB). This feature is potentially measurable from the B-mode polarization map of Planck and BICEP-2 and leads to determination of the modulation strength. Measurability of SI violated polarization field due to this model is estimated for Planck and PRISM. Absence of the signal in the polarization field can restrict the viability of the model.

引用

页数：6

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