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  1. MAR

    30

    Today

    Particle Physics Seminar

    "Is there evidence for cosmic acceleration?"

    Presented by Subir Sarkar, Oxford University

    11 am, Small Seminar Room, Bldg. 510

    Thursday, March 30, 2017, 11:00 am

    Hosted by: ''Xin Qian''

    The 'standard' model of cosmology is founded on the basis that the expansion rate of the universe is accelerating at present – as was inferred from the Hubble disgram of Type la supernovae. There exists now a much bigger database of supernovae so we can perform rigorous statistical tests to check whether these 'standardisable candles' indeed indicate cosmic acceleration. Taking account of the empirical procedure by which corrections are made to their absolute magnitudes to allow for the varying shape of the light curve and extinction by dust, we find that the data are still consistent with a constant rate of expansion. The implications of this will be discussed.

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