Cosmology Seminar

Cosmology Seminars are held at on Mondays at 11 am during the academic year, on the 3rd floor Varian conference room. These are more focused and less didactic than the colloquium, and provide a stage for younger researchers to present their work in more detail.  

Please contact Risa WechslerDaniel GruenJosh Meyers, or Kyle Story for more information.

Gravitational wave astrophysics and cosmology with large galaxy surveys

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Location

Campus, Varian 355

Speaker
Antonella Palmese (Fermilab)

In the occasion of the exciting discovery of the electromagnetic counterpart of the GW170817 gravitational wave event, the Dark Energy Survey (DES) collaboration produced a series of studies covering different aspects of the event. In particular, these studies showed that observations of the GW170817 host galaxy can provide information about the formation of the binary neutron star that merged, producing the gravit

Bright (active) Galaxies in Dark Matter halos

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Location

Campus, Varian 355

Speaker
Shadab Alam (University of Edinburgh)

The bright galaxies comes in different colours and show different activities. Some are red, some blue and others have angry supermassive blackholes. These galaxies acts as the doorway to the cosmological universe we live in. Our understanding of inner working of universe and its mysterious dark components of matter and energy depends on the very large scale structure formed by these bright galaxies.

Stellar Property Statistics of Massive Halos: Common Kernel Shapes from Multiple Cosmological Hydrodynamics Simulations

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Location

Campus, Varian 355

Speaker
August (Gus) Evrard (University of Michigan)

In the last decade, the astrophysical processes driving galaxy formation in a cosmological context at kpc scales have been incorporated, largely independently, into multiple codes developed by different simulation teams.

The probability distribution function (PDF) of cosmic density fluctuations: How to measure it? How to model it? What information does it contain?

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Location

Campus, Varian 355

Speaker
Oliver Friedrich (Kavli Institute for Cosmology Cambridge)

In this talk I will lead you through the highlights of a series of papers (Gruen++2018, Friedrich++2018, Friedrich&Uhlemann et al. in prep, Uhlemann&Friedrich et al. in prep) that promote an alternative framework of studying large scale structure data: analysis of the 1-point PDF of density fluctuations. The main difference between the PDF and 2-point correlation functions is readily explained: 2-point functions measure the variance of fluctuations as a function of scale, while the PDF measures all moments of the fluctuations at one scale.

Statistical Challenges in photometric redshift inference

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Location

Campus, Varian 355

Speaker
Markus Michael Rau (Carnegie Mellon University)

Observations from large area photometric surveys like LSST or DES will constrain cosmology to unprecedented precision. Deep wide-area imaging will provide observations for faint galaxy samples, for which traditional redshift calibration using spectroscopic data is very difficult.

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