KICP Friday Noon Seminars: 2018
Current & Future KICP Seminars
DateTalk TitleSpeaker
January 19, 2018Discussion on old and new mechanisms of leptogenesisJessica M Turner, Fermi National Accelerator Laboratory
January 26, 2018Mass' not the only thing: Secondary effects in the galaxy-halo connectionYao-Yuan Mao, University of Pittsburgh
February 2, 2018High redshift 21cm intensity mapping Past, Present, and FutureDaniel Jacobs, Arizona State University
February 9, 2018The impact of massive neutrinos on cosmological observablesFrancisco Villaescusa-Navarro, Center for Computational Astrophysics

Past KICP Seminars
DateTalk TitleSpeaker
January 12, 2018Topics in weak lensingPatricia Larsen, Argonne National Laboratory

Topics in weak lensing
January 12, 2018 | ERC 401 | 12:00 PM
Click on the image to enlarge
Patricia Larsen, Argonne National Laboratory

Gravitational weak lensing has emerged in recent years as a powerful probe of cosmology, giving important constraints on both dark and luminous matter. This has led to a number of ambitious future surveys, which promise to revolutionise the field if theoretical challenges can be met. In this talk I will discuss some of my recent work in the field of weak lensing, spanning a range of topics including combined probe analysis, intrinsic alignment contamination and delensing.

Discussion on old and new mechanisms of leptogenesis
January 19, 2018 | ERC 401 | 12:00 PM
Click on the image to enlarge
Jessica M Turner, Fermi National Accelerator Laboratory

In the first half of the talk, I will present preliminary results which indicate the scale of thermal leptogenesis may be several orders of magnitude lower than previously thought.
In the second half of this talk I will present a mechanism of leptogenesis which is based on the vacuum CP-violating phase transition. This approach differs from classical thermal leptogenesis as a specific seesaw model, and its UV completion, need not be specified. The lepton asymmetry is generated via the dynamically realised coupling of the Weinberg operator during the phase transition. This
mechanism provides strong connections with low-energy neutrino experiments.

Mass' not the only thing: Secondary effects in the galaxy-halo connection
January 26, 2018 | ERC 401 | 12:00 PM
Yao-Yuan Mao, University of Pittsburgh

High redshift 21cm intensity mapping Past, Present, and Future
February 2, 2018 | ERC 401 | 12:00 PM
Daniel Jacobs, Arizona State University

The redshifted 21 cm line from neutral hydrogen provides a direct, cosmological scale, probe of the epochs of reionization and heating. In the past decade, multiple experimental arrays have worked towards detection and characterization of this spectral line signal at redshifts 6 and higher. HERA is a second generation instrument probing 21cm emission and absorption at redshifts from 6 to 20. The use of large static dishes provides sensitivity which is predicted to be roughly an order of magnitude larger than first generation experiments while advances in instrumentation and technique aim for reduced foreground contamination. The raw sensitivity provided by dishes is high enough that forecasts of astrophysical parameter constraint precision is limited mainly by model uncertainty not sensitivity, and that for the first time direct imaging of features is theoretically possible. HERA is proceeding with construction while observing in parallel with new dishes being added as they become available. The 2017-2018 observing season with 40 dishes is forecasted to have roughly double the sensitivity of previous experiments. Here we report the ongoing commissioning of this array and present early results of experiments in calibration and imaging.

The impact of massive neutrinos on cosmological observables
February 9, 2018 | ERC 401 | 12:00 PM
Francisco Villaescusa-Navarro, Center for Computational Astrophysics