자료유형  

 학위논문

Control Number  

0017164150

International Standard Book Number  

9798384086994

Dewey Decimal Classification Number  

593.7

Main Entry-Personal Name  

Chen, Muping.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of California, Los Angeles., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

132 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: Gelmini, Graciela B.

Dissertation Note  

Thesis (Ph.D.Physics.)--University of California, Los Angeles, 2024.

Summary, Etc.  

요약We study two topics in this thesis: the halo-independent (HI) analysis method for dark matter (DM)-electron scattering and the phenomenology of sterile neutrinos (νss) produced in the evaporation of early Universe black holes We demonstrate how the HI analysis can be applied to sub-GeV DM scattering off electrons for noble gas targets such as Xe and semiconductor targets such as Ge and Si. In the HI analysis method, properties of the local DM halo velocity distribution are inferred from direct DM detection data, which allows the comparison of different data sets without making any assumption on the uncertain local dark halo characteristics. This method had previously been developed for and applied only to DM scattering off nuclei. We additionally show that in-medium effects could significantly affect HI analysis results for semiconductor targets Ge and Si and thus are essential for proper inference of local DM halo characteristics from direct DM detection data. For νss as DM candidates, we discuss in detail the characteristics and phenomenology of νss that minimally couple only to active neutrinos and are produced in the evaporation of early Universe primordial black holes (PBHs), a process we call "PBH sterile neutrinogenesis". Contrary to previously studied νs production mechanisms, this novel mechanism does not depend on the active-sterile mixing. The resulting νss have a distinctive spectrum and are produced with larger energies than in typical scenarios. This characteristic enables νss to be warm DM in the unusual 0.3 MeV to 0.3 TeV mass range if PBHs do not matter-dominate the Universe before evaporating. When PBHs matter-dominate before evaporating, the possible coincidence of induced gravitational waves associated with PBH evaporation and astrophysical X-ray observations from νs decays would constitute a distinct signature of our scenario.

Subject Added Entry-Topical Term  

Particle physics.

Subject Added Entry-Topical Term  

Astrophysics.

Subject Added Entry-Topical Term  

Physics.

Index Term-Uncontrolled  

Dark matter

Index Term-Uncontrolled  

Black holes

Index Term-Uncontrolled  

Neutrinos

Index Term-Uncontrolled  

Neutrinogenesis

Added Entry-Corporate Name  

University of California, Los Angeles Physics 0666

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:658606