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University of Cincinnati

1. Eby, Joshua. Phenomenology and Astrophysics of Gravitationally-Bound Condensates of Axion-Like Particles.

Degree: PhD, Arts and Sciences: Physics, 2017, University of Cincinnati

Light, spin-0 particles are ubiquitous in theories of physics beyond the Standard Model, and many of these make good candidates for the identity of dark matter. One very well-motivated candidate of thistype is the axion. Due to their small mass and adherence to Bose statistics, axions can coalesce into heavy, gravitationally-bound condensates known as boson stars, also known as axion stars (in particular). Inthis work, we outline our recent progress in attempts to determine the properties of axion stars. We begin with a brief overview of the Standard Model, axions, and bosonic condensates in general. Then, in the context of axion stars, we will present our recent work, which includes: numerical estimates of the macroscopic properties (mass, radius, and particle number) of gravitationally stable axion stars; a calculation of their decay lifetime through number-changing interactions; an analysis of the gravitational collapse process for very heavy states; and an investigation of the implications of axion stars as dark matter. The basic conclusions of our work are that weakly-bound axion stars are only stable up to some calculable maximum mass, whereas states with larger masses collapse to a small radius, but do not form black holes. During collapse, a rapidly increasing binding energy implies a fast rate of decay to relativistic particles, giving rise to a Bosenova. Axion stars that are otherwise stable could be caused to collapse either by accretion of free particles to masses above the maximum, orthrough astrophysical collisions; in the latter case, we estimate the rate of collisions and the parameter space relevant to induced collapse. Advisors/Committee Members: Wijewardhana, L.C.R. (Committee Chair).

Subjects/Keywords: Particle Physics; Dark Matter; Axions; Bose-Einstein Condensate; Bosenova; Gravitational Collapse; Beyond Standard Model

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

APA (6th Edition):

Eby, J. (2017). Phenomenology and Astrophysics of Gravitationally-Bound Condensates of Axion-Like Particles. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868633515325

Chicago Manual of Style (16th Edition):

Eby, Joshua. “Phenomenology and Astrophysics of Gravitationally-Bound Condensates of Axion-Like Particles.” 2017. Doctoral Dissertation, University of Cincinnati. Accessed June 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868633515325.

MLA Handbook (7th Edition):

Eby, Joshua. “Phenomenology and Astrophysics of Gravitationally-Bound Condensates of Axion-Like Particles.” 2017. Web. 20 Jun 2019.

Vancouver:

Eby J. Phenomenology and Astrophysics of Gravitationally-Bound Condensates of Axion-Like Particles. [Internet] [Doctoral dissertation]. University of Cincinnati; 2017. [cited 2019 Jun 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868633515325.

Council of Science Editors:

Eby J. Phenomenology and Astrophysics of Gravitationally-Bound Condensates of Axion-Like Particles. [Doctoral Dissertation]. University of Cincinnati; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868633515325

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