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Does the Universe Accelerate Equally in all Directions?

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arxiv 0909.3861 v1 pith:5RNZEVQV submitted 2009-09-22 astro-ph.CO

Does the Universe Accelerate Equally in all Directions?

classification astro-ph.CO
keywords dipolecosmicaccelerateaccelerationalmostanalysisapproachbackground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We employ the Union compilation of Type Ia supernovae with a maximum likelihood analysis to search for a dark energy dipole. To approach this problem, we present a simple, computationally efficient, and largely model independent method. We opted to weight each SN by its observed error estimate, so poorly measured SNe that deviate substantially from the Hubble law do not produce spurious results. We find, with very low significance, a dipole in the cosmic acceleration directed roughly towards the cosmic microwave background dipole, but this is almost certainly coincidental.

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