[seminar] Drazen Glavan, 22.12. (ponedjeljak) 12h (c.t.), Predavaona I krila IRB

[Kornelija Passek-Kumericki]

                       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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Late-time quantum backreaction of a non-minimally coupled massless  scalar



Drazen Glavan
Utrecht University, The Netherlands


   Datum:  ponedjeljak, 22. prosinca 2014.
   Vrijeme: 12 sati c.t.
   Mjesto: IRB, predavaona I krila


Sazetak:

Quantum fluctuations of the field contribute to its energy-momentum tensor.
This contribution (backreaction) should source the Einstein equations. For
fields living on time-dependent backgrounds, such as FLRW, this contribution
to the energy-momentum tensor can exhibit secular behavior - its magnitude
can grow in time. Given enough time, in certain cases, it can grow large
enough to considerably alter the classical dynamics of the expansion of the
Universe. I will present a model of a non-minimally coupled scalar field
whose inflationary quantum fluctuations are evolved throughout the history
of the Universe, from inflation to radiation and matter dominated eras. The
energy-momentum tensor of these fluctuations is calculated in each era. For
certain range of non-minimal coupling the backreaction remains small
throughout the history and in late matter era exhibits interesting transient
phenomena where it grows large and could affect the expansion considerably,
similar to the effect of Dark Energy.

Voditeljica seminara: Kornelija Passek-Kumericki (passek at irb dot hr)
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