Constrained inflaton due to a complex scalar

Budhi, Romy H. S. (Physics Department, Gadjah Mada University, Yogyakarta 55281, Indonesia) (Institute for Theoretical Physics, Kanazawa University, Kanazawa 920-1192, Japan) ; Kashiwase, Shoichi (Institute for Theoretical Physics, Kanazawa University, Kanazawa 920-1192, Japan) ; Suematsu, Daijiro (Institute for Theoretical Physics, Kanazawa University, Kanazawa 920-1192, Japan)

30 January 2017

Abstract: We reexamine inflation due to a constrained inflaton in the model of a complex scalar. Inflaton evolves along a spiral-like valley of special scalar potential in the scalar field space just like single field inflation. Sub-Planckian inflaton can induce sufficient e-foldings because of a long slow-roll path. In a special limit, the scalar spectral index and the tensor-to-scalar ratio has equivalent expressions to the inflation with monomial potential φn. The favorable values for them could be obtained by varying parameters in the potential. This model could be embedded in a certain radiative neutrino mass model


Published in: JCAP 1509 (2015) 039
Published by: Institute of Physics Publishing/SISSA
DOI: 10.1088/1475-7516/2015/09/039
arXiv: 1505.05955
License: CC-BY-3.0



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