[seminar] Z. Vlah, Perturbative approaches to large scale structure ...

[Kresimir Kumericki]

Prirodoslovno-matematički fakultet
FIZIČKI ODSJEK 
Bijenička c. 32, Zagreb, Hrvatska

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                     SEMINAR  TEORIJSKE  FIZIKE
(Zajednički seminari Fizičkog odsjeka PMF-a te Odjela za fiziku IRB-a)

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Perturbative approaches to large scale structure formation 
  and redshift space distortions

Zvonimir Vlah

Institute for Theoretical Physics, University Zurich

Datum: srijeda, 24. travnja 2013.
Vrijeme: 14 sati c.t.
Mjesto: PMF, Fizički odsjek, Bijenička c. 32, F-201


Sažetak:

Recently cosmological perturbation theory has emerged as a viable method of
predicting cosmological observations of large scale structure (LSS). On the
theory side this is primarily motivated by the development of well defined
perturbative expansion approaches, and by the development of numerical
techniques to evaluate the N-loop diagrams and associated loop integrals.
Motivation on the observational side arises form the scope of present and
upcoming cosmological surveys of LSS, which offer an opportunity to constrain
cosmological models, including the models of the origins of structure in the
universe (e.g. inflation and alternatives), the composition of the universe
(especially the nature of the dark matter and the dark energy) and the question
of neutrino mass.

Among the probes of LSS most promising one, in terms of statistical power and
challenges given the current understanding, is the galaxy clustering in
redshift space or so called redshift space distortions (RSD). These measure
galaxy clustering in 3 dimensions and, amongst all probes of LSS, potentially
provide the largest amount of information. But to grasp this information
requires a better understanding of nonlinear evolution of structure, biasing of
galaxies relative to dark matter distribution and peculiar velocity effects.
Properly understood peculiar velocity induced distortions in the statistics of
the galaxy distribution can be used to measure the dark energy equation of
state and the linear growth rate of structures as a function of redshift --
each of which provides powerful constraints on new physics (modifications to
gravity, etc.).

Voditelj seminara:
dr. Krešimir Kumerički (kkumer at phy.hr)