dc.contributor.advisor | Heckel, Blayne R | |

dc.contributor.author | Chen, Yi | |

dc.date.accessioned | 2019-02-22T17:08:02Z | |

dc.date.available | 2019-02-22T17:08:02Z | |

dc.date.submitted | 2018 | |

dc.identifier.other | Chen_washington_0250E_19508.pdf | |

dc.identifier.uri | http://hdl.handle.net/1773/43441 | |

dc.description | Thesis (Ph.D.)--University of Washington, 2018 | |

dc.description.abstract | 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, $m_{a}$. We use the data that measures the static EDM of $^{199}Hg$ 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$\times 10^{-29}$ $e \cdot cm$. 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$\times 10^{-4}$ Hz is 2.3$\times 10^{-29}$ $e \cdot cm$. The static EDM of $^{199}Hg$ 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. | |

dc.format.mimetype | application/pdf | |

dc.language.iso | en_US | |

dc.rights | none | |

dc.subject | Bootstrap | |

dc.subject | electric dipole moment | |

dc.subject | periodogram | |

dc.subject | time-varying EDM | |

dc.subject | Atomic physics | |

dc.subject.other | Physics | |

dc.title | Axion-like Dark Matter Detection with Mercury-199 Atoms | |

dc.type | Thesis | |

dc.embargo.terms | Open Access | |