============== Multi-messenger signals from gravitational wave sources Neutron star mergers had long been suspected to produce gravitational wave "chirps", gamma ray bursts and produce r-process elements. While overall convincing, all these conjectures were based on indirect arguments and none was proven directly. This changed on August 17, 2017: a gravitational wave signal from a merging … Continue reading "Prof. Stephan Rosswog (Stockholm University)"

Title: Connecting the first galaxies with ultra-faint dwarfs in the local Universe. Abstract : Ultra-Faint Dwarf Galaxies (UFDs) are the least luminous systems and also the least metal- enriched systems. Their simple, ancient nature, gives us an opportunity to look back at the star formation activities in early galaxies. In this talk, I will present the … Continue reading "CRA Seminar **Special Time** ( Myoungwon Jeon, U. Arizona )"

Cosmic-ray anisotropy searches with the Fermi Large Area Telescope Cosmic rays arrive at Earth nearly isotropically due to magnetic deflection during propagation. However, small anisotropy has now been measured in cosmic-ray nuclei over eight orders of magnitude in energy, from 100 GeV to 10^10 GeV. This anisotropy is an essential observable in the study of … Continue reading "CRA Seminar: Prof. Justin Vandenbroucke (UW Madison)"

Making a Universe with (Rel)axions The discovery of the Higgs boson reinforces the possibility that other similar, scalar particles may exist in nature. In this talk, I will begin by discussing one such dark matter and sometime inflaton candidate, the axion. I will describe the claim that dark matter axions form an exotic state of … Continue reading "CRA Seminar: Dr. Chanda Prescod-Weinstein (University of Washington, Seattle) **Special Time**"