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Winter Mini Workshop on Gravity and Cosmology

21–23 Jan 2019
Faculty of Physics, University of Warsaw
Europe/Warsaw timezone

organiser

Session

physics of primordial universe

21 Jan 2019, 09:00
Faculty of Physics, University of Warsaw

Faculty of Physics, University of Warsaw

seminar room 4.50 (1st and 2nd day), 4.49 (3rd day) Faculty of Physics, University of Warsaw ul. Pasteura 5, 02-093 Warszawa Poland

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  1. 1. Light Particles with Spin in Inflation
    Dr Lorenzo Bordin (University of Nottingham)
    21/01/2019, 09:00
    physics of primordial universe

    The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton foliation, since this breaks the de Sitter isometries. The action for these states can be constructed within the Effective Field Theory of Inflation, or using a CCWZ procedure. Light particles with spin...

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  2. 2. To B or not to B: Primordial magnetic fields from Weyl anomaly
    Dr Takeshi Kobayashi (ICTP, Trieste )
    21/01/2019, 09:45
    physics of primordial universe

    For more than twenty years, it has been argued that the Weyl anomaly of quantum electrodynamics sources cosmological magnetic fields in the early universe. If true, this would be a natural way to produce the seed magnetic fields of our universe within the Standard Model. In this talk, I will examine this long-standing claim and show that there is actually no production of coherent magnetic...

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  3. 6. Gravitational waves and their footprints from primordial interactions
    Dr Ryo Namba
    21/01/2019, 11:00

    Detection of tensor mode fluctuations at the largest cosmological scales is often expected to provide a robust evidence of inflation and to fix the inflationary energy scale. Such direct connection is however applicable only when gravitational waves (GWs), the source of tensor perturbations, are effectively decoupled from other energy contents. However, spin-1 particles can be produced...

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  4. 5. Dirac analysis of cosmological perturbation theory.
    Mr Przemysław Małkiewicz (National Centre for Nuclear Research)
    21/01/2019, 11:45

    I will talk about the Dirac procedure for constrained systems applied to the Arnowitt-Deser-Misner formalism linearized around the Friedmann-Lemaitre universe. I will employ some basic concepts such as Dirac observables, Dirac brackets, gauge-fixing conditions, reduced phase space, physical Hamiltonian and physical dynamics, and the canonical isomorphism between different gauge-fixed surfaces....

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