Is there an underlying connection between dark matter and electromagnetism - Testing stellar twins?
Testing fundamental physics with stellar twins: Is there an underlying connection between dark matter and electromagnetism? Michael Murphy (Swinburne)
The Standard Model of nature's laws provides no explanation for the fundamental constants, like electromagnetism's strength, alpha. It is therefore up to experiments to test whether fundamental constants are, indeed, constant and universal, or instead vary and depend on other physical parameters. I will describe a new probe of alpha's constancy within our Galaxy – spectroscopy of stellar twins – and show our first results from solar twins that have an ensemble precision of 12 parts-per-billion. This is already the best astronomical constraint on alpha's variability. I will show that a class of giant stars – red clump stars – also provide precise measurements with this approach. Red clump stars are so luminous that we can obtain high quality spectra even when they are ~7 kpc away, within ~1 kpc of our Galaxy's Centre where dark matter is thought to be concentrated. We have begun a program on the Keck and Very Large Telescopes to map alpha across the Milky Way and, importantly, its widely-varying dark matter density field. This will be a completely new, direct test of physics beyond the Standard Model.
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