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SpeakerTobias Baldauf (University of Zurich)
Date Oct 24, 2012
Time 12:00 pm  
Location 464 Loomis
Sponsor Department of Physics
Event type Seminar/Symposium
Views 3666

The clustering of galaxies in ongoing and upcoming galaxy surveys contains a wealth of cosmological information. Extracting this information is a non-trivial task since galaxies and their host haloes are stochastic tracers of the non-linear matter density field. The relation between matter and halo distribution is commonly expressed in terms of a local bias model. Recent studies have revealed inconsistencies between the simple local Eulerian bias model and simulations. I will explain two effects that can explain and partially cure these inconsistencies. Firstly, non-local bias terms proportional to the tidal tensor are generated by gravitational evolution and their presence can be detected in the halo bispectrum. Secondly, I will explain how discreteness of haloes and their small scale exclusion alters the large scale halo power spectrum.

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