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Search of the primordial gravitational waves with Very Long Baseline Interferometry

Created 17/10/2025

Updated 17/10/2025

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Some models of the expanding Universe predict that the astrometric proper motion of distant radio sources embedded in space-time are non-zero as the radial distance from observer to the source grows. Systematic proper motion effects would produce a predictable quadrupole pattern on the sky that could be detected using Very Long Baseline Interferometry (VLBI) technique. This quadrupole pattern can be interpreted either as an anisotropic Hubble expansion, or as a signature of the primordial gravitational waves in the early Universe. We have analyzed a large set of geodetic VLBI data spanning from 1979 till 2015 to estimate the quadrupole harmonics in the expansion of the vector field of the proper motions of quasars in the sky. We estimated the vector spherical harmonics (three parameters for the dipole and ten - for the quadrupole systematic) by means of analysis of the intermediate individual proper motion. Additionally, the same estimates have been obtained separately for different red shift zones. The results of analysis are presented in this paper. Presented at the 28th Texas Symposium on Relativistic Astrophysics Geneva, Switzerland – December 13-18, 2015

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Field Value
Title Search of the primordial gravitational waves with Very Long Baseline Interferometry
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/c213f264-fa18-4066-9138-137bb6c0bb3a
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Search of the primordial gravitational waves with Very Long Baseline Interferometry". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/search-of-the-primordial-gravitational-waves-with-very-long-baseline-interferometry