Mixed non-gaussianity from axion-gauge field dynamics

被引：23
作者：
Fujita, Tomohiro [1 ,2 ,3 ]
Namba, Ryo [4 ]
Obata, Ippei [5 ]
机构：
[1] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[2] Univ Geneva, Dept Phys Theor, Quai E Ansermet 24, CH-1211 Geneva 4, Switzerland
[3] Univ Geneva, Ctr Astroparticle Phys, Quai E Ansermet 24, CH-1211 Geneva 4, Switzerland
[4] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
[5] Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778582, Japan
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2019年 / 04期
基金：
加拿大自然科学与工程研究理事会;
关键词：
cosmological perturbation theory; gravitational waves and CMBR polarization; inflation; non-gaussianity; GRAVITATIONAL-WAVES; INFLATION; FLATION;
D O I：
10.1088/1475-7516/2019/04/044
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study scalar-tensor-tensor cross correlation <zeta hh > generated by the dynamics of interacting axion and SU(2) gauge fields during inflation. We quantize the quadratic action and solve the linear equations by taking into account mixing terms in a non-perturbative manner. Combining that with the in-in formalism, we compute contributions from cubic interactions to the bispectrum B-zeta hh. We find that the bispectrum is peaked at the folded configuration, which is a unique feature encoded by the scalar mixing and localized production of tensor modes. With our parameter choice, the amplitude of the bispectrum is k(6) B-zeta hh similar to 10(-16). The unique shape dependence, together with the parity-violating nature, is thus a distinguishing feature to search for in the CMB observables.
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页数：30
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