Inflaton fragmentation in E models of cosmological α-attractors

Fuminori Hasegawa and Jeong-Pyong Hong
Phys. Rev. D 97, 083514 – Published 23 April 2018

Abstract

Cosmological α-attractors are observationally favored due to the asymptotic flatness of the potential. Since its flatness induces the negative pressure, the coherent oscillation of the inflaton field could fragment into quasistable localized objects called I-balls (or “oscillons”). We investigated the possibility of I-ball formation in E models of α-attractors. Using the linear analysis and the lattice simulations, we found that the instability sufficiently grows against the cosmic expansion and the inflaton actually fragments into the I-balls for α103.

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  • Received 30 October 2017

DOI:https://doi.org/10.1103/PhysRevD.97.083514

© 2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Fuminori Hasegawa1,2,* and Jeong-Pyong Hong1,2,†

  • 1ICRR, University of Tokyo, Kashiwa, 277-8582, Japan
  • 2Kavli IPMU (WPI), UTIAS, University of Tokyo, Kashiwa, 277-8583, Japan

  • *fuminori@icrr.u-tokyo.ac.jp
  • hjp0731@icrr.u-tokyo.ac.jp

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Issue

Vol. 97, Iss. 8 — 15 April 2018

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