Parity violation in the CMB bispectrum by a rolling pseudoscalar
Parity violation in the CMB bispectrum by a rolling pseudoscalar
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DOI：
10.1088/1475-7516/2013/11/051
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发表时间：
2013-08
影响因子：
6.4
通讯作者：
M. Shiraishi;A. Ricciardone;S. Saga
中科院分区：
文献类型：
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作者：
M. Shiraishi;A. Ricciardone;S. Saga
我们调查宇称违反签名的温度和偏振双谱的宇宙微波背景（CMB）在暴胀模型中，一个滚动的赝标量产生大的等边张量非高斯。基于全天空理论的具体计算表明，所得到的CMB双谱在奇偶偶（l1+l2+l3 =偶）和奇偶奇（l1 + l2 +l3 =奇）空间都有非零信号，并且与通常的标量模等边双谱几乎不相关.这些特征签名和偏振信息有助于检测这种张量非高斯性。温度和E模式双谱的使用潜在地相对于仅用温度双谱的分析提高了400%的可检测性。考虑到B模式双谱，信噪比可能能够增加3个数量级。我们提出了1σ的不确定度的参数依赖于耦合常数和滚动条件的赝标预期在普朗克和建议的PRISM实验。
We investigate parity-violating signatures of temperature and polarization bispectra of the cosmic microwave background (CMB) in an inflationary model where a rolling pseudoscalar produces large equilateral tensor non-Gaussianity. By a concrete computation based on full-sky formalism, it is shown that resultant CMB bispectra have nonzero signals in both parity-even (l1+l2+l3 = even) and parity-odd (l1+l2+l3 = odd) spaces, and are almost uncorrelated with usual scalar-mode equilateral bispectra. These characteristic signatures and polarization information help to detect such tensor non-Gaussianity. Use of both temperature and E-mode bispectra potentially improves of 400% the detectability with respect to an analysis with temperature bispectrum alone. Considering B-mode bispectrum, the signal-to-noise ratio may be able to increase by 3 orders of magnitude. We present the 1σ uncertainties of a parameter depending on a coupling constant and a rolling condition for the pseudoscalar expected in the Planck and the proposed PRISM experiments.