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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

Thomas Schucker , André Tilquin , Galliano Valent This is my paper · ORCID
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keywords bianchidiagramhubblemetricsaunderssupernovaeanisotropyapparent
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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 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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  3. Gravitational Lensing in a Kasner Background: Distinguishing Wormholes and Black Holes

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    In a Kasner (anisotropic) universe, wormhole and black-hole lenses produce different directional splits of the Einstein-like scale, while the full critical curves remain nearly circular.

  4. Polymer Bianchi-I with polymer matter

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    In a Bianchi-I universe with polymer quantization of both geometry and a massless scalar, the matter polymer scale shifts the quantum bounce and alters volume and anisotropy evolution.

  5. Probing the Cosmological Principle with weak lensing shear

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    A Euclid-like weak lensing survey could detect the E-B shear cross-correlation produced by late-time anisotropic expansion, yielding a new probe of the Cosmological Principle.

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