Probing the anisotropic universe with gravitational waves

Modern cosmology rests on the working assumption that the Universe is isotropic and homogeneous at large scales. Here, we document a number of anomalous observations pointing to an anisotropic Universe in a direction consistent with the CMB dipole. If physical, this should be confirmed by any cosmol...

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Bibliographic Details
Main Author: Colgáin, Eoin Ó
Format: Conference Proceeding
Language:English
Subjects:
Brightening
Cosmic microwave background
Dipoles
Gravitational waves
Sirens
Universe
Online Access:Get full text
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Summary:Modern cosmology rests on the working assumption that the Universe is isotropic and homogeneous at large scales. Here, we document a number of anomalous observations pointing to an anisotropic Universe in a direction consistent with the CMB dipole. If physical, this should be confirmed by any cosmological probe with sufficient data quality. To that end, we perform the first hemispherical decomposition of bright and dark standard siren H0 determinations, finding that the maximum of the H0 posterior is larger in the CMB dipole direction for dark sirens, but including the bright siren posterior reverses this conclusion. As may be expected, the limited number of GW observations is consistent with an isotropic Universe, but this can change going forward. It is imperative to repeat these tests as GW sources become more numerous and better localised.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0218153