Physics study center uw11/19/2023 ![]() ![]() They play essential roles in star formation, in the evolution of double, or binary stars, and in many other astrophysical settings,” Zweibel says. “Accretion disks, their magnetic fields, and their magnetized jets are found throughout the Universe. Simulation of the magnetic field threading the black hole and confined by orbiting gas (adapted from Ripperda et al. Her question asks how these accretion flows contribute to magnetizing black holes to form relativistic jets, or powerful emissions of radiation and high-energy particles. Zweibel’s research will use the extreme environment of spinning black holes, where the electromagnetic field has recently been identified as a major factor in accretion flows, or the movement of gases into the dense center. We would like to go from first principle physics to understand these phenomena.” ![]() “There are also several major questions revealed by recent observations, such as extended TeV gamma-ray halos around neutron stars that are completely new phenomena. “How do those particles survive, in the sense that these extreme energy particles would interact with the surrounding media and produce secondary particles, and how do these interactions play a role in converting what you see on Earth?” Fang’s research asks. High energy particles streaming from neutron stars are detectable on Earth, but they tend to be significantly altered by the time they make it here. The neutron star “labs” that Fang is using are amongst the most dense stars in the universe - as small as 10 kilometers in diameter and with densities a million billion times that of water. “Particle in cell” simulation of the magnetic field and electric current associated with a spinning and strongly magnetized neutron star (adapted from Philippov and Kramer 2023) | From SCEECS Fang is co-investigator on a neutron star question, and she is paired with Anatoly Spitkovsky at Princeton. Zweibel serves as the lead investigator on her black hole question, and she is paired with Richard Anantua at UT-San Antonio. Each question pairs at least one senior-level investigator with an early-career co-investigator. SCEECS has six main research questions, three centered on understanding electrodynamics in neutron stars and three centered in black holes. The Simons Collaboration on Extreme Electrodynamics of Compact Sources (SCEECS) will study how electrodynamics - the interaction of electric currents and magnetic fields - behave in extreme environments in the distant universe using a combination of theory, simulation, and observation. They are natural places to test many fundamental physics theories.”įang and UW–Madison astronomy and physics professor Ellen Zweibel are part of a new research collaboration announced August 21 by the Simons Foundation. “For example, a neutron star offers a magnetic field that is trillions of times stronger than on the Earth, and magnetars offer a field that is hundreds of trillions of time stronger. “It’s never guaranteed, as we see many theories break down at extreme environments,” says University of Wisconsin–Madison physics professor Ke Fang. Do forces and energies work the same on earth as they do in all corners of the universe? Ellen Zweibel Ke Fang But our planet is just one location, with its own relatively mild electromagnetic field. U.S.Much of what we understand about fundamental physics is based on experiments done in the convenient “lab” of earth. relationship and Canada’s role in the world. The Center also offers public programming to increase knowledge and understanding of Canada, the Canada-U.S. The Center offers a major, minor and International Studies track in Canadian studies an Arctic Studies minor an associated students program for undergraduates scholarships for undergraduate students to study in British Columbia Foreign Language and Area Studies (FLAS) fellowships and a professional development program for graduate students an affiliated faculty program a Fulbright Visiting Chair in Arctic Studies research fellowships through the Arctic and International Relations Initiative and a K-12 teacher associate program. The Pacific Northwest National Resource Center’s mission is to increase the number of scholars, educators and professionals knowledgeable about Canada in the Pacific Northwest and across the nation.
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