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.

TBD

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Location

Campus, Varian 355

Speaker
Camille Avestruz (University of Chicago)

A Quick Intro to Bayes and Emulating the Matter Power Spectrum

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Location

Campus, Varian 355

Speaker
Earl Lawrence (Los Alamos National Laboratory)

I will start with a short introduction to Bayesian statistics, including the magic of Markov chain Monte Carlo. With these concepts, I will describe how to build and use an emulator, a fast statistical approximation to a computationally intensive simulation. I will present this in the context of the Cosmic Emu, an emulator for the matter power spectrum based on large n-body simulations.

Gravitational lensing of line intensity maps

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Location

Campus, Varian 355

Speaker
Simon Foreman (CITA, Toronto)

Gravitational lensing of the cosmic microwave background (CMB) has emerged as a powerful cosmological probe, made possible by the development and characterization of nearly-optimal estimators for extracting the lensing signal from temperature and polarization maps. One can ask whether similar tools can be applied to upcoming "intensity maps" of emission lines at various wavelengths (e.g. 21cm).

Constraining Primordial Gravitational Waves Using Present and Future CMB Polarization Experiments

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Location

Campus, Varian 355

Speaker
Victor Buza (Harvard-Smithsonian Center for Astrophysics)

Finding direct evidence of Primordial Gravitational Waves (PGWs) is one of the most exciting and important goals in fundamental physics today. The polarized light of the Cosmic Microwave Background (CMB) provides a powerful dataset from which we may detect PGWs and draw quantitative conclusions about the early Universe.

Suppressing cooling flows in massive galaxies with cosmic ray injection and turbulent stirring

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Location

Campus, Varian 355

Speaker
Kung-Yi Su (Caltech)

The quenching "maintenance" and related "cooling flow" problems are important in galaxies from Milky Way mass through clusters. We investigate this in halos with masses ~1e12-1e14 solar mass, using non-cosmological high-resolution hydrodynamic simulations with the FIRE-2 (Feedback In Realistic Environments) stellar feedback model.

The abundance and dark matter structure of galaxies in alternative dark matter models

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Location

Campus, Varian 355

Speaker
Omid Sameie (UC Riverside)

Strong dark matter interactions are proposed to alleviate the tension between observations and theoretical predictions in CDM. Among different interaction channels, self-interacting dark matter (SIDM) models have received considerable attention.

Secondary Anisotropies: Cosmology from Joint Analyses of CMB and Galaxy Surveys

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Location

Campus, Varian 355

Speaker
Eric Baxter (University of Pennsylvania)

Large scale structure leaves an imprint in the cosmic microwave background (CMB) in the form of secondary anisotropies.  As a result of these small distortions, CMB and galaxy surveys provide highly complementary cosmological probes.  I will illustrate how this complementarity can be exploited using cross-survey correlations between galaxy surveys and (i) CMB lensing and (ii) the Sunyaev-Zel’dovich effect.  Moreover, the complementarity of CM

New Directions in Galaxy Formation and Cosmology Following the First High-z 21-cm Detection

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Location

Campus, Varian 355

Speaker
Jordan Mirocha (Mcgill University)

On March 1st, the EDGES collaboration reported the detection of a sharp absorption signal in the all-sky radio spectrum at ~80 MHz. This frequency is roughly consistent with early theoretical predictions for the global 21-cm signal, a sky-averaged spectral signature of neutral hydrogen atoms in the intergalactic medium before cosmic reionization.

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