Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20910313k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #103.13; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
I have used observations of pulsating white dwarfs to explore previously untested theories in fundamental particle physics, such as the properties of plasmon neutrinos and of the more exotic axions. Plasmon neutrinos result from the decay of a photon into a neutrino-antineutrino pair in a dense plasma. Axions present an elegant solution to the strong CP problem in particle physics. If massive enough, they could account for dark matter (though their viability as dark matter candidates also depends on the specific axion model and cosmological model of axion formation). Both axions and plasmon neutrinos are weakly interacting particles that can have a measurable effect on the cooling of white dwarfs. The rate of period change of pulsating white dwarfs gives us a measure of the cooling rate of those stars and therefore provides information about the production of plasmon neutrinos and axions. I present results based on the observations of two pulsating white dwarfs, G117-B15A and EC20058, which I analyzed asteroseismologically. The need for knowing more precisely the stellar parameters of the observed stars, especially the effective temperature, also led me to explore an unsolved problem in the field of white dwarf asteroseismology: How exactly are the pulsations driven?
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