The Hubble diagram in a Bianchi I univers
Thomas Schucker
TL;DR
This paper analyzes the Bianchi I cosmological model using supernova data, finding a potential anisotropic signal that future LSST observations could confirm or refute.
Contribution
It presents a fit of the Bianchi I model to supernova data and discusses the potential for future LSST data to test anisotropy in the universe.
Findings
Potential anisotropic signal detected in supernova data
Future LSST observations could confirm or falsify the anisotropy
No statistically significant anisotropy found in current data
Abstract
The Bianchi I metric describes a homogeneous, but anisotropic universe and is commonly used to fit cosmological data. A fit to the angular distribution of 740 supernovae of type Ia with measured redshift and apparent luminosity is presented. It contains an intriguing, yet non-significant signal of a preferred direction in the sky. The Large Synoptic Survey Telescope being built in Chile should measure some 500 000 supernovae within the next 20 years and verify or falsify this signal.
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astronomy and Astrophysical Research · Pulsars and Gravitational Waves Research