The intrinsic non-Gaussianity of the Cosmic Microwave Background

The intrinsic non-Gaussianity of the Cosmic Microwave Background The intrinsic non-Gaussianity of the Cosmic Microwave Background
  • Contact

    Chabely Prats
    Instituto Física Teórica UAM/CSIC
    C/Nicolás Cabrera, 13-15 Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid.

  • Keywords

    Gaussianity, CBM, physics,

  • Registration costs

    Non

  • Working language

    English

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Seminar
Spain
Madrid

The non-Gaussianity of the Cosmic Microwave Background (CMB) is a powerful probe of the early Universe since it can be related to the physics that took place soon after the Big Bang. In particular, the detection of a non-vanishing CMB bispectrum by the Planck satellite would rule out the simplest models of cosmic inflation, opening to the exciting possibility of multi-field physics in the early Universe. However, we do not expect all of the observed non-Gaussianity to be of primordial origin. Non-linear evolution will also generate some degree of non-Gaussianity that will contaminate the primordial signal. We estimate this intrinsic CMB non-Gaussianity by using a new, efficient code for solving the second-order Einstein-Boltzmann equations. The full calculation involves contributions from recombination and less tractable contributions from terms integrated along the line of sight. When including all physical effects but lensing and time-delay, we find the bias on the primordial non-Gaussianity to be below the expected sensitivity of the Planck satellite.

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