Statistically anisotropic tensor modes from inflation

Tomohiro Fujita; Ippei Obata; Takahiro Tanaka; Shuichiro Yokoyama

doi:10.1088/1475-7516/2018/07/023

Statistically anisotropic tensor modes from inflation

Tomohiro Fujita, Ippei Obata, Takahiro Tanaka, Shuichiro Yokoyama

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

18 Citations (Scopus)

Abstract

We consider the inflationary universe with a spectator scalar field coupled to a U(1) gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments with respect to the angle θ between a wave number k and a background vector field as _h∝ (1-cos^2θ+cos^4θ-cos^6θ) irrespective of the model parameters.

Original language	English
Article number	023
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2018
Issue number	7
DOIs	https://doi.org/10.1088/1475-7516/2018/07/023
Publication status	Published - 2018 Jul 12
Externally published	Yes

Keywords

Inflation
physics of the early universe

ASJC Scopus subject areas

Astronomy and Astrophysics

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10.1088/1475-7516/2018/07/023

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abstract = "We consider the inflationary universe with a spectator scalar field coupled to a U(1) gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments with respect to the angle θ between a wave number k and a background vector field as h∝ (1-cos2θ+cos4θ-cos6θ) irrespective of the model parameters.",

keywords = "Inflation, physics of the early universe",

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AU - Fujita, Tomohiro

AU - Obata, Ippei

AU - Tanaka, Takahiro

AU - Yokoyama, Shuichiro

N1 - Funding Information: This work was supported in part by MEXT KAKENHI Grant Numbers 17J09103 (T.F.), 15J01345 (I.O.), 17H06357 and 17H06358 (T.T.), and 15K17659 (S.Y.) as well as the Grant-in-Aid for Scientific Research No. 26287044 and 15H02087 (T.T.), and 16H01103 (S.Y.). Publisher Copyright: © 2018 IOP Publishing Ltd and Sissa Medialab.

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N2 - We consider the inflationary universe with a spectator scalar field coupled to a U(1) gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments with respect to the angle θ between a wave number k and a background vector field as h∝ (1-cos2θ+cos4θ-cos6θ) irrespective of the model parameters.

AB - We consider the inflationary universe with a spectator scalar field coupled to a U(1) gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments with respect to the angle θ between a wave number k and a background vector field as h∝ (1-cos2θ+cos4θ-cos6θ) irrespective of the model parameters.

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Statistically anisotropic tensor modes from inflation

Abstract

Keywords

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