Probing pre-inflationary anisotropy with directional variations in the gravitational wave background
arXiv:1609.02785 · doi:10.1088/1475-7516/2017/01/009
Abstract
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.
arXiv comment26 pages, 15 figures
References in corpus (23)
- Observation of Gravitational Waves from a Binary Black Hole Merger
- Planck 2015 results. XIII. Cosmological parameters
- BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
- Statistics of Cosmic Microwave Background Polarization
- A Joint Analysis of BICEP2/Keck Array and Planck Data
- Signature of Gravity Waves in Polarization of the Microwave Background
- Possibility of Direct Measurement of the Acceleration of the Universe Using 0.1 Hz Band Laser Interferometer Gravitational Wave Antenna in Space
- A Probe of Primordial Gravity Waves and Vorticity
- Beyond LISA: Exploring Future Gravitational Wave Missions
- Low-frequency gravitational-wave science with eLISA/NGO
- Mission design of LiteBIRD
- A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-Degree Scales with POLARBEAR
- Theory of cosmological perturbations in an anisotropic universe
- Predictions from an anisotropic inflationary era
- Inflationary perturbations in anisotropic backgrounds and their imprint on the CMB
- The POLARBEAR-2 and the Simons Array Experiment
- Measurements of Sub-degree B-mode Polarization in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data
- Gravity Waves Signatures from Anisotropic pre-Inflation
- Linearization of homogeneous, nearly-isotropic cosmological models
- Perturbations of generic Kasner spacetimes and their stability
- Scalar field in the anisotropic universe
- Power Spectrum and Non-Gaussianities in Anisotropic Inflation
- The Initial State of a Primordial Anisotropic Stage of Inflation