KICP Seminars & Colloquia, Summer 2019

KICP Seminars & Colloquia

Seminar schedule for Summer 2019

July 12, 2019 Open Group seminar	Yuuki Omori Stanford University	Survey synergy: combining CMB and galaxy surveys [Abstract]
July 16, 2019 Special seminar	Taylor Hoyt University of Chicago	The Carnegie-Chicago Hubble Program: A Tip of the Red Giant Branch measurement of the Hubble Constant [Abstract]
July 16, 2019 Astronomy Special Seminar	Taylor Hoyt University of Chicago	The Carnegie-Chicago Hubble Program: A Tip of the Red Giant Branch measurement of the Hubble Constant [Abstract]
September 3, 2019 Astronomy Tuesday Seminar	Ruediger Pakmor MPA-Garching	Magnetic fields and cosmic rays in disk galaxies [Abstract]
September 9, 2019 Open Group seminar	Samuel Passaglia UChicago	Does inflation produce enough primordial black holes to be the dark matter? [Abstract]

SPECIAL SEMINARS

July 16, 2019 | 3:00 PM | ERC 401 | Special seminar
The Carnegie-Chicago Hubble Program: A Tip of the Red Giant Branch measurement of the Hubble Constant
Taylor Hoyt, University of Chicago

For as long as we have known about the expanding universe, the classical distance ladder measurement of the Hubble constant has relied on the Cepheid Leavitt Law. A century later, the Carnegie Chicago Hubble Program has used the tip of the red giant branch (TRGB) distance scale to measure a Hubble constant independent of the extragalactic Leavitt Law. In this talk, I will briefly summarize recent measurements of H0 (audience contributions invited), then present the main results of the TRGB program, followed by an open-ended discussion and Q+A.

OPEN GROUP SEMINARS

July 12, 2019 | 12:00 PM | ERC 401 | Open Group seminar
Survey synergy: combining CMB and galaxy surveys
Yuuki Omori, Stanford University

Large scale structure (LSS) alters the appearance of both background galaxies and the cosmic microwave background (CMB) through the effect of gravitational lensing. Auto and cross-correlations of these observables provide us independent information, and the various probes can be combined to constrain cosmology. In this talk, I will present the recent results from combining SPT and DES year 1 data sets. I will also discuss what we have learnt, and the improvements we are going to make in the year 3 analysis.
September 9, 2019 | 10:30 AM | ERC 419 | Open Group seminar
Does inflation produce enough primordial black holes to be the dark matter?
Samuel Passaglia, UChicago

I will discuss the inflationary side of the primordial black hole dark matter story. I will show why in single-field inflation, slow-roll conditions must be violated for PBH production to occur. I will discuss the leading single-field model which can produce PBHs, known as Ultra Slow-Roll, and show how it breaks much of the common intuition we have about inflation. I will explore whether it is easier to produce PBH with an additional spectator field during inflation, and in particular study the case where the spectator field is the Standard Model Higgs.

ASTRONOMY TUESDAY SEMINARS

September 3, 2019 | 12:00 PM | ERC 576 | Tuesday Seminar
Magnetic fields and cosmic rays in disk galaxies
Ruediger Pakmor, MPA-Garching

Only very recently cosmological zoom simulations of galaxies have started to be able to include the evolution of magnetic fields and the treatment of relativistic cosmic ray particles. I will present recent results from the Auriga simulations of high resolution cosmological zoom simulations of Milky Way-like galaxies and show how the magnetic field in these galaxies is amplified and ordered during cosmic evolution. Moreover, I will discuss how the inclusion of cosmic rays in the cosmological simulations changes the properties of disk galaxies and their circumgalactic medium.

ASTRONOMY SPECIAL SEMINARS

July 16, 2019 | 3:00 PM | ERC 401 | Special Seminar
The Carnegie-Chicago Hubble Program: A Tip of the Red Giant Branch measurement of the Hubble Constant
Taylor Hoyt, University of Chicago

For as long as we have known about the expanding universe, the classical distance ladder measurement of the Hubble constant has relied on the Cepheid Leavitt Law. A century later, the Carnegie Chicago Hubble Program has used the tip of the red giant branch (TRGB) distance scale to measure a Hubble constant independent of the extragalactic Leavitt Law. In this talk, I will briefly summarize recent measurements of H0 (audience contributions invited), then present the main results of the TRGB program, followed by an open-ended discussion and Q+A.