Hunting for statistical anisotropy in tensor modes with B -mode observations

Takashi Hiramatsu; Shuichiro Yokoyama; Tomohiro Fujita; Ippei Obata

doi:10.1103/PhysRevD.98.083522

Hunting for statistical anisotropy in tensor modes with B -mode observations

Takashi Hiramatsu, Shuichiro Yokoyama, Tomohiro Fujita, Ippei Obata

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

7 Citations (Scopus)

Abstract

We investigate the possibility of constraining statistical anisotropies of the primordial tensor perturbations by using future observations of the cosmic microwave background (CMB) B-mode polarization. By parametrizing a statistically anisotropic tensor power spectrum as Ph(k)=Ph(k)ngncosnθk, where θk is an angle of the direction of k^=k/k from a preferred direction, we find that it is possible for future B-mode observations such as CMB-S4 to detect the tensor statistical anisotropy at the level of gn∼O(0.1).

Original language	English
Article number	083522
Journal	Physical Review D
Volume	98
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevD.98.083522
Publication status	Published - 2018 Oct 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.98.083522

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title = "Hunting for statistical anisotropy in tensor modes with B -mode observations",

abstract = "We investigate the possibility of constraining statistical anisotropies of the primordial tensor perturbations by using future observations of the cosmic microwave background (CMB) B-mode polarization. By parametrizing a statistically anisotropic tensor power spectrum as Ph(k)=Ph(k)ngncosnθk, where θk is an angle of the direction of k^=k/k from a preferred direction, we find that it is possible for future B-mode observations such as CMB-S4 to detect the tensor statistical anisotropy at the level of gn∼O(0.1).",

author = "Takashi Hiramatsu and Shuichiro Yokoyama and Tomohiro Fujita and Ippei Obata",

note = "Funding Information: This work was partially supported by JSPS KAKENHI No. JP16K17695 (T. H.), No. JP15K17659 (S. Y.) and No. JP17J09103 (T. F.) and also MEXT KAKENHI No. 15H05888 (S. Y.) and No. 18H04356 (S. Y.). T. H. was also supported by the MEXT Supported Program for the Strategic Research Foundation at Private Universities (S1411024). Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

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AU - Hiramatsu, Takashi

AU - Yokoyama, Shuichiro

AU - Fujita, Tomohiro

AU - Obata, Ippei

N1 - Funding Information: This work was partially supported by JSPS KAKENHI No. JP16K17695 (T. H.), No. JP15K17659 (S. Y.) and No. JP17J09103 (T. F.) and also MEXT KAKENHI No. 15H05888 (S. Y.) and No. 18H04356 (S. Y.). T. H. was also supported by the MEXT Supported Program for the Strategic Research Foundation at Private Universities (S1411024). Publisher Copyright: © 2018 American Physical Society.

PY - 2018/10/15

Y1 - 2018/10/15

N2 - We investigate the possibility of constraining statistical anisotropies of the primordial tensor perturbations by using future observations of the cosmic microwave background (CMB) B-mode polarization. By parametrizing a statistically anisotropic tensor power spectrum as Ph(k)=Ph(k)ngncosnθk, where θk is an angle of the direction of k^=k/k from a preferred direction, we find that it is possible for future B-mode observations such as CMB-S4 to detect the tensor statistical anisotropy at the level of gn∼O(0.1).

AB - We investigate the possibility of constraining statistical anisotropies of the primordial tensor perturbations by using future observations of the cosmic microwave background (CMB) B-mode polarization. By parametrizing a statistically anisotropic tensor power spectrum as Ph(k)=Ph(k)ngncosnθk, where θk is an angle of the direction of k^=k/k from a preferred direction, we find that it is possible for future B-mode observations such as CMB-S4 to detect the tensor statistical anisotropy at the level of gn∼O(0.1).

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Hunting for statistical anisotropy in tensor modes with B -mode observations

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