Probing pre-inflationary anisotropy with directional variations in the gravitational wave background

Journal Article · Sun Jan 01 00:00:00 EST 2017 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2017/01/009· OSTI ID:22680108

Furuya, Yu; Niiyama, Yuki; Sendouda, Yuuiti ^[1]

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1. Graduate School of Science and Technology, Hirosaki University, 3 Bunkyocho, Hirosaki, Aomori 036-8561 (Japan)

We perform a detailed analysis on a primordial gravitational-wave background amplified during a Kasner-like pre-inflationary phase allowing for general triaxial anisotropies. It is found that the predicted angular distribution map of gravitational-wave intensity on large scales exhibits topologically distinctive patterns according to the degree of the pre-inflationary anisotropy, thereby serving as a potential probe for the pre-inflationary early universe with future all-sky observations of gravitational waves. We also derive an observational limit on the amplitude of such anisotropic gravitational waves from the B -mode polarisation of the cosmic microwave background.

• OSTI ID: 22680108
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMPLITUDES
ANGULAR DISTRIBUTION
ANISOTROPY
GRAVITATIONAL WAVES
INFLATIONARY UNIVERSE
POLARIZATION
RELICT RADIATION
UNIVERSE