期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2013/11/043
关键词
inflation; non-gaussianity; cosmological perturbation theory
资金
- Basic Science Research Program of the National Research Foundation of Korea [2013R1A1A1006701]
- JSPS [21244033]
- Grants-in-Aid for Scientific Research [21244033] Funding Source: KAKEN
- National Research Foundation of Korea [APCTP, 2013R1A1A1006701] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The effect of self-interactions of heavy scalar fields during inflation on the primordial non-Gaussianity is studied. We take a specific constant-turn quasi-single field inflation as an example. We derive an effective theory with emphasis on non-linear self-interactions of heavy fields and calculate the corresponding non-Gaussianity, which is of equilateral type and can be as relevant as those computed previously in the literature. We also derive the non-Gaussianity by directly using the in-in formalism, and verify the equivalence of these two approaches.
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