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May 2018

Closing in on the HIdden universe

mcluver

Dr. Michelle Cluver, ARC Future Fellow, Senior Lecturer Swinburne University Email: michelle.cluver@gmail.com As the experiments looking to detect dark matter close in (coming from different directions on the Feynman Diagram), a small fraction of the baryon community is quietly anticipating a window on the universe (21cm neutral hydrogen) to de-fog a little. While theoretical simulators continue to grapple with the challenges of “mocking the universe”, observers can focus on refining (or even just beginning to understand) the prescriptive, previously sub-grid, physics and…

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The lithium-rich giant star puzzle

acasey

Dr. Andy Casey, Postdoctoral Fellow Monash University Email: andrew.casey@monash.edu All theoretical models of stellar evolution predict that most of the lithium inside a star is destroyed as the star becomes a red giant. However, observations reveal that about 1% of red giants are peculiarly rich in lithium, often exceeding the amount in the interstellar medium or predicted from the Big Bang. With only 151 lithium-rich giants discovered in the past four decades, and no distinguishable properties other than lithium enhancement, the origin…

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