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Title: Solar models including revised abundances and dark matter : constraints from helioseismology and neutrino observations
Author: Watson, L. Scott.
ISNI:       0000 0001 3564 2773
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2007
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This thesis presents several topics in both standard and non-standard solar models using the Iben Stellar Evolution Code. First, a set of standard solar models are developed using the abundance determination of Grevesse & Noels (1993) and the more recent determination of Asplund et al. (2005a,b). This recent solar photospheric abundance analysis reduces the abundances of heavy elements, most notably C, N, 0, Ne and Ar, by 0.15 to 0.20 dex, lowering the solar Z/X to 0.0165, compared to the previous Grevesse & Noels value of Z/X = 0.0245. A comparison study between these models show evolutions based on newer determinations with reduced heavy-element abundances break the previously excellent agreement between the standard solar model and the helioseismic inferences of sound speed profile, convection zone base radius and surface Y abundance. Multiple approaches taken to reconcile the new abundances with helioseismology are discussed, and models with selective enhancements to diffusion given special attention. The results of all attempts provide an incomplete and unsatisfactory solution. Evolution, helioseismic and g-mode calculations were done in a separate study of nonstandard solar models for spin-dependent interactions with 5 - 20 GeV mass WIMPs in a parameter space loosely constrained by detection experiments. Results for models with 10-40 ::; (O''annV) ::; 10-27 cm3 s-l show that solar modelling can only constrain parameters for \VIMP background densities Px > 103 GeV cm-3 if their annihilation is dominated by scalar interactions; the case for neutralinos. For dark matter annihilating through vector interactions, such as scalar dark matter, the solar model can be used to place constraints on WHviP parameters at a background density of Px ,...., 0.3 GeVcm-3, which is predicted for the Sun.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available