Curvature perturbation and domain wall formation with pseudo scaling scalar dynamics

Yohei Ema; Kazunori Nakayama; Masahiro Takimoto

doi:10.1088/1475-7516/2016/02/067

Curvature perturbation and domain wall formation with pseudo scaling scalar dynamics

Yohei Ema, Kazunori Nakayama, Masahiro Takimoto

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Cosmological dynamics of scalar field with a monomial potential φⁿ with a general background equation of state is revisited. It is known that if n is smaller than a critical value, the scalar field exhibits a coherent oscillation and if n is larger it obeys a scaling solution without oscillation. We study in detail the case where n is equal to the critical value, and find a peculiar scalar dynamics which is neither oscillating nor scaling solution, and we call it a pseudo scaling solution. We also discuss cosmological implications of a pseudo scaling scalar dynamics, such as the curvature perturbation and the domain wall problem.

Original language	English
Article number	067
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2016
Issue number	2
DOIs	https://doi.org/10.1088/1475-7516/2016/02/067
Publication status	Published - 2016 Feb 29
Externally published	Yes

Keywords

Cosmic strings
domain walls
monopoles
non-gaussianity
physics of the early universe

ASJC Scopus subject areas

Astronomy and Astrophysics

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10.1088/1475-7516/2016/02/067

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abstract = "Cosmological dynamics of scalar field with a monomial potential φn with a general background equation of state is revisited. It is known that if n is smaller than a critical value, the scalar field exhibits a coherent oscillation and if n is larger it obeys a scaling solution without oscillation. We study in detail the case where n is equal to the critical value, and find a peculiar scalar dynamics which is neither oscillating nor scaling solution, and we call it a pseudo scaling solution. We also discuss cosmological implications of a pseudo scaling scalar dynamics, such as the curvature perturbation and the domain wall problem.",

keywords = "Cosmic strings, domain walls, monopoles, non-gaussianity, physics of the early universe",

author = "Yohei Ema and Kazunori Nakayama and Masahiro Takimoto",

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T1 - Curvature perturbation and domain wall formation with pseudo scaling scalar dynamics

AU - Ema, Yohei

AU - Nakayama, Kazunori

AU - Takimoto, Masahiro

PY - 2016/2/29

Y1 - 2016/2/29

N2 - Cosmological dynamics of scalar field with a monomial potential φn with a general background equation of state is revisited. It is known that if n is smaller than a critical value, the scalar field exhibits a coherent oscillation and if n is larger it obeys a scaling solution without oscillation. We study in detail the case where n is equal to the critical value, and find a peculiar scalar dynamics which is neither oscillating nor scaling solution, and we call it a pseudo scaling solution. We also discuss cosmological implications of a pseudo scaling scalar dynamics, such as the curvature perturbation and the domain wall problem.

AB - Cosmological dynamics of scalar field with a monomial potential φn with a general background equation of state is revisited. It is known that if n is smaller than a critical value, the scalar field exhibits a coherent oscillation and if n is larger it obeys a scaling solution without oscillation. We study in detail the case where n is equal to the critical value, and find a peculiar scalar dynamics which is neither oscillating nor scaling solution, and we call it a pseudo scaling solution. We also discuss cosmological implications of a pseudo scaling scalar dynamics, such as the curvature perturbation and the domain wall problem.

KW - Cosmic strings

KW - domain walls

KW - monopoles

KW - non-gaussianity

KW - physics of the early universe

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JF - Journal of Cosmology and Astroparticle Physics

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Curvature perturbation and domain wall formation with pseudo scaling scalar dynamics

Abstract

Keywords

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