CCAPP Summer Lecture Series: Heidi Wu, Brian Clark

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July 16, 2019
11:30AM - 12:30PM
Location
4138 PRB

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Add to Calendar 2019-07-16 11:30:00 2019-07-16 12:30:00 CCAPP Summer Lecture Series: Heidi Wu, Brian Clark Heidi Wu Probing Cosmic Acceleration with Galaxy Clusters Abstract: The acceleration of the Universe is one of the biggest puzzles in physics: is it due to acosmological constant, dynamical dark energy, or modification of gravity?  Galaxy clusters provide a unique opportunity to answer this question.  In this talk, I will first discuss how we use cluster abundances to constrain cosmic acceleration, and how the weak gravitational lensing by clusters plays a key role.  I will then focus on the covariance matrices for future ground- and space-based missions, including the effects of galaxy intrinsic ellipticities, large-scale structure, and variation in halo density profiles.   Brian Clark The Quest for Ultra-High Energy Neutrinos Abstract: Ultra-high energy neutrinos (>10 PeV) are unique messengers to the distant high energy universe, as cosmic rays and gamma rays are destroyed en-route to earth from cosmic accelerators. Due to low-cross sections and low-fluxes, detecting UHE neutrinos requires enormous volumes. In this talk, I will review the status and recent upgrades to the Askaryan Radio Array—an experiment at the South Pole seeking to detect neutrinos through the radio-Cherenkov effect. I will then present the optimization of a search for ultra-high energy neutrinos in four-years of data from ARA station 2, which is the largest period of lifetime yet analyzed by the collaboration. 4138 PRB Center for Cosmology and AstroParticle Physics (CCAPP) ccapp@osu.edu America/New_York public
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Heidi Wu

Probing Cosmic Acceleration with Galaxy Clusters

Abstract: The acceleration of the Universe is one of the biggest puzzles in physics: is it due to acosmological constant, dynamical dark energy, or modification of gravity?  Galaxy clusters provide a unique opportunity to answer this question.  In this talk, I will first discuss how we use cluster abundances to constrain cosmic acceleration, and how the weak gravitational lensing by clusters plays a key role.  I will then focus on the covariance matrices for future ground- and space-based missions, including the effects of galaxy intrinsic ellipticities, large-scale structure, and variation in halo density profiles.

 

Brian Clark

The Quest for Ultra-High Energy Neutrinos

Abstract: Ultra-high energy neutrinos (>10 PeV) are unique messengers to the distant high energy universe, as cosmic rays and gamma rays are destroyed en-route to earth from cosmic accelerators. Due to low-cross sections and low-fluxes, detecting UHE neutrinos requires enormous volumes. In this talk, I will review the status and recent upgrades to the Askaryan Radio Array—an experiment at the South Pole seeking to detect neutrinos through the radio-Cherenkov effect. I will then present the optimization of a search for ultra-high energy neutrinos in four-years of data from ARA station 2, which is the largest period of lifetime yet analyzed by the collaboration.

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