Physics and Astronomy Colloquia

*Winter Quarter Colloquia Start at 4:00 pm*

Title: New Insights on the Origin of Cosmic Rays

Speaker: Damiano Caprioli, University of Chicago

Abstract: The origin of extraterrestrial energetic particles (usually referred to as “cosmic rays”) has puzzled scientists since the pioneering discovery by Victor Hess in 1912. In the last decade, however, modern supercomputers have opened a new window on the processes regulating space and astrophysical plasmas, allowing the study of particle acceleration via first-principles kinetic simulations. I present state-of-the-art particle-in-cells simulations of non-relativistic shocks, in which ion and electron acceleration efficiency and magnetic field amplification are studied in detail as a function of the environmental parameters. I then discuss the theoretical and observational counterparts of such findings, comparing them with in-situ measurements at shocks in the heliosphere (especially the Earth’s bow shock) and with multi-wavelength observations of astrophysical objects such as supernova remnants and galaxy clusters. Finally, I present an original mechanism for the acceleration of the highest energy cosmic rays, up to 10^20eV, in the ultra-relativistic jets of powerful blazars, outlining how it naturally reproduces the latest results of the Pierre Auger Observatory.

Host: Tchekhovskoy

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


Title: Primordial Non-Gaussianities and the Distribution of Galaxies on Large Scales

Speaker: Mark Wise, Caltech

Abstract: The inflationary cosmology predicts a primordial two point spatial correlation of the dark matter mass density that is almost scale invariant. This is in agreement with measurements of the microwave background anisotropy. The fluctuations in the dark matter mass density generated during the inflationary era may not be Gaussian. I discuss how such primordial non-Gaussianities can dramatically alter our expectations for the spatial correlations of the number density of galaxies on large length scales (~ greater than 100 Mpc/h). I discuss this phenomena in the context of a very simple inflationary model. It is possible that these dramatic effects will be observed in upcoming large scale surveys like LSST.

Host: De Gouvea

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Kate Ross: TBA

February 2, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Kate Ross, Colorado State University 

Abstract: TBA

Host: Goswami

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Alexandra Boltasseva: TBA

February 9, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Alexandra Boltasseva, Purdue University

Abstract: TBA

Host: Stern

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Sebastian Heinz: TBA

February 16, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Sebastian Heinz, University of Wisconsin-Madison

Abstract: TBA

Host: Tchekhovskoy

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Joel Moore: TBA

March 2, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Joel Moore, UC Berkeley

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Amy Reines: TBA

March 9, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Amy Reines, Montana State University 

Abstract: TBA

Host: Tchekhovskoy

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Gerald Gabrielse: TBA

March 16, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Gerald Gabrielse, Northwestern University, Department of Physics & Astronomy 

Abstract: TBA

Host: Schmitt

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Vidya Madhavan: TBA

April 6, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Vidya Madhavan, UIUC

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Peter Armitage: TBA

April 20, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Peter Armitage, Johns Hopkins University

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Ryan Chornock : TBA

May 4, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Ryan Chornock, Ohio University 

Abstract: TBA

Host: Tchekhovskoy

Speaker Schedule

Keywords: Physics, Astronomy, colloquium


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Subir Sachdev: TBA

May 11, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Subir Sachdev, Harvard University 

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Ana Maria Rey: TBA

September 28, 2018, 4:00 PM - 5:00 PM

Title: 

Speaker:Ana Maria Rey, University of Colorado-Boulder

Abstract: 

Host: 

Speaker Schedule

Keywords: Physics, Astronomy, colloquium