[seminar] D. Glavan, 10.7. (ponedjeljak) 11h (c.t.), seminar ZTF-a
Anđelo Samsarov
Andjelo.Samsarov at irb.hr
Mon Jul 3 15:14:50 CEST 2017
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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