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University of Washington

1. Chen, Yi. Axion-like Dark Matter Detection with Mercury-199 Atoms.

Degree: PhD, 2019, University of Washington

The objective of this dissertation is to search for axion dark matter through the coupling between the axion field and the electric dipole moment(EDM) of mercury-199 atoms. If the axion is the significant fraction of dark matter, the coupling leads to a time-varying nuclear EDM that oscillates at the frequency proportional to the axion mass, ma. We use the data that measures the static EDM of 199Hg atoms to look for a simple sinusoidal signal on the top of the static EDM value. The Lomb-Scargle periodogram, as a power spectrum estimator, allows us to analyze our unequally spaced EDM data in time. With two different approaches both with and without error weighting, they give a consistent result on no detection of dark matter. The most significant peak among the four EDM periodograms has a false alarm probability of 31% calculated with the Bootstrap method. The magnitude of the maximum peak can be generated by injecting a sinusoidal signal with the amplitude of 1.81 ×  10-29 e ∙ cm. The smallest periodic signal our measurement can detect as the maximum peak in the periodogram with 95% confidence in the frequency range of 0 to 6.17 ×  10-4 Hz is 2.3 ×  10-29 e ∙ cm. The static EDM of 199Hg by itself is an important topic. This thesis will only briefly mention it and mainly cover the parts that are relevant to time-varying EDM analysis. Advisors/Committee Members: Heckel, Blayne R (advisor).

Subjects/Keywords: Bootstrap; electric dipole moment; periodogram; time-varying EDM; Atomic physics; Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, Y. (2019). Axion-like Dark Matter Detection with Mercury-199 Atoms. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/43441

Chicago Manual of Style (16th Edition):

Chen, Yi. “Axion-like Dark Matter Detection with Mercury-199 Atoms.” 2019. Doctoral Dissertation, University of Washington. Accessed March 20, 2019. http://hdl.handle.net/1773/43441.

MLA Handbook (7th Edition):

Chen, Yi. “Axion-like Dark Matter Detection with Mercury-199 Atoms.” 2019. Web. 20 Mar 2019.

Vancouver:

Chen Y. Axion-like Dark Matter Detection with Mercury-199 Atoms. [Internet] [Doctoral dissertation]. University of Washington; 2019. [cited 2019 Mar 20]. Available from: http://hdl.handle.net/1773/43441.

Council of Science Editors:

Chen Y. Axion-like Dark Matter Detection with Mercury-199 Atoms. [Doctoral Dissertation]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/43441

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