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Bianchi I meets the Hubble diagram

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arxiv 1405.6523 v2 pith:Y4RF3WNI submitted 2014-05-26 astro-ph.CO

Bianchi I meets the Hubble diagram

classification astro-ph.CO
keywords bianchidiagramhubblemetricsaunderssupernovaeanisotropyapparent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We improve existing fits of the Bianchi I metric to the Hubble diagram of supernovae and find an intriguing yet non-significant signal for anisotropy that should be verified or falsified in the near future by the Large Synoptic Survey Telescope. Since the literature contains two different formulas for the apparent luminosity as a function of time of flight in Bianchi I metrics, we present an independent derivation confirming the result by Saunders (1969). The present fit differs from earlier ones by Koivisto & Mota and by Campanelli et al. in that we use Saunders' formula, a larger sample of supernovae, Union 2 and JLA, and we use the general Bianchi I metric with three distinct eigenvalues.

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Cited by 1 Pith paper

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