[seminar] [DANAS] D. Glavan, 10.7. (ponedjeljak) 11h (c.t.), seminar ZTF-a

[Anđelo Samsarov]

          SEMINAR  TEORIJSKE  FIZIKE


    (Zajednički seminari Fizičkog odsjeka PMF-a te Zavoda za teorijsku
     fiziku i Zavoda za eksperimentalnu fiziku IRB-a)

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    Electrodynamic Effects of Inflationary Gravitons


    Dražen Glavan
    Faculty of Physics,
    University of Warsaw


    Datum:  ponedjeljak, 10. srpnja 2017.
    Vrijeme: 11 sati c.t.
    Mjesto: IRB, predavaona I krila


   Sažetak:

   Our Universe went through a phase of very rapid, almost
exponential expansion in its beginning, known as inflation.
Such rapid expansion is known to lead to considerable particle   
production of non-conformally coupled quantum fields, even at tree   
level. Photons are conformally coupled to gravity and therefore do   
not get produced due to cosmological expansion, while gravitons are   
not and do get produced a lot. Since gravitons couple universally to   
all matter fields they can induce sizable effects for conformally   
coupled fields through loop corrections. I will present computations   
in two different gauges for the one-loop graviton corrections to   
photon vacuum polarization in de Sitter spacetime. This is used to   
quantum correct Maxwell equations, and I will present two cases, (i)   
correction to dynamical photons, and (ii) correction to the Coulomb   
force between two point charges. The corrections in both cases   
exhibit secular growth. Gauge dependence will be discussed.


Voditelj seminara: Anđelo Samsarov (asamsarov at irb.hr)

http://thphys.irb.hr/Seminar/list.htm
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