Work

Delta-N formalism for curvaton with modulated decay

Year: 2013

Type: article

Abstract: In this paper, the curvature perturbation generated by the modulated curvaton decay is studied by a direct application of δ N -formalism. Our method has a sharp contrast with the non-linear formalism which may be regarded as an indirect usage of δ N -formalism. We first show that our method can readily reproduce results in previous works of modulation of curvaton. Then we move on to calculate the case where the curvaton mass (and hence also the decay rate) is modulated. The method can be applied to the calculation of the modulation in the freezeout model, in which the heavy species are considered instead of the curvaton. Our method explains curvaton and various modulation on an equal footing.

Source: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2013/06/009

Authors: Kazunori Kohri, Chia-Min Lin, Tomohiro Matsuda

Institutions: High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI, Institute of Particle and Nuclear Studies, Kobe University, Saitama Institute of Technology

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: Chuo University, Ministry of Education, Culture, Sports, Science and Technology, Japan Society for the Promotion of Science