• Feb 12 2015

    J. RIchard Bond, CITA, University of Toronto


    Dear All,

    Please be reminded of the seminar this afternoon.


    Cosmic Photons, Phonons, Gravitons & Neutrinos in light of the Planck Satellite 2015 Data Release

    J. RIchard Bond, CITA, University of Toronto

    The remarkable precision-cosmology results from the satellites Planck and WMAP and the the earth-bound higher resolution ACT and SPT unveiled over the past few years follow two decades of experimentation since the COBE satellite discoveries and the first proposal for Planck. The long-anticipated second release of cosmological information from Planck has just occurred, and I will review some highlights. We have revealed a story of simplicity at the time the first-light photons were freed from matter 380000 years after the (so-called) Big Bang, 13.8 billion years ago, encoded in seven (or so) numbers which so-far fully characterize the photon distribution then. Even more astounding is currently just two numbers characterize the energy-density-phonons whose condensate drives the accelerated inflation of the ultra-early Universe and whose fluctuations grow into the Cosmic Web of galaxies we observe. A third number is the long-sought amplitude of quantum-generated primordial gravity waves, now directly constrained by combining Planck and the South-Pole-based BICEP/KECK polarization data. Planck 2015 also refines the energy density measurements of various species that make up our universe, including baryons, dark matter, dark energy, and massive neutrinos. Taken together, the cosmic standard model (tilted LambdaCDM) provides a better fit now than ever, although a few tensions exist with other data sets, and there are a few large-scale anomalies which may point to more early and/or late Universe complexity than tilted LambdaCDM accounts for.

    Date: Thursday, 12th February 2015

    Time: 14h30 - 15h30

    Venue: NITheP Seminar Room, H-Block, 3rd Floor


    Kind regards
    Neli


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