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Axions and Dark Sectors from String Theory.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Axions and Dark Sectors from String Theory./
作者:	de Souza, Gustavo Salinas.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	171 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-01, Section: B.
Contained By:	Dissertations Abstracts International83-01B.
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28547569
ISBN:	9798516946165

Axions and Dark Sectors from String Theory.
de Souza, Gustavo Salinas.

Axions and Dark Sectors from String Theory. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 171 p.

Source: Dissertations Abstracts International, Volume: 83-01, Section: B.

Thesis (Ph.D.)--Northeastern University, 2021.

This item must not be sold to any third party vendors.

The low energy limit of string theoretical models often predict the existence of many axions and hidden gauge sectors. This dissertation presents a collection of works exploring some of the consequences of this scenario to particle phenomenology and cosmology. We focus on ultralight axions, which are common occurrence on studies of large ensembles of string vacua, and dark gauge sectors without matter. There are many ongoing experiments looking for axions, a majority of which explores their coupling to photons. In this context, we discuss an enhancement of axion-photon couplings in string compactifications with large number of axions, which results in couplings that are within the reach of both current and proposed experimental searches. Axions are also used in many models of dark matter and inflation/reheating. We investigate here a model of axion reheating with many axions and gauged dark sectors, in which we identify classes of axion reheatons that result in asymmetric reheating. In addition, a dark matter model composed of both ultralight axions and dark glueballs (bound states of dark gluons) is constructed, which displays unique phenomenology, given the "fuzzy" nature of the axions and the strong self-interactions of the glueballs. The formation of these dark glueballs often follows from a first-order confining phase transition, which is known to produce a gravitational wave signal. We end this dissertation by describing a phenomenological model of confinement that can estimate the intensity of this signal.

ISBN: 9798516946165Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Axion

Axions and Dark Sectors from String Theory.
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300 $a 171 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-01, Section: B.
500 $a Advisor: Nelson, Brent D.
502 $a Thesis (Ph.D.)--Northeastern University, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The low energy limit of string theoretical models often predict the existence of many axions and hidden gauge sectors. This dissertation presents a collection of works exploring some of the consequences of this scenario to particle phenomenology and cosmology. We focus on ultralight axions, which are common occurrence on studies of large ensembles of string vacua, and dark gauge sectors without matter. There are many ongoing experiments looking for axions, a majority of which explores their coupling to photons. In this context, we discuss an enhancement of axion-photon couplings in string compactifications with large number of axions, which results in couplings that are within the reach of both current and proposed experimental searches. Axions are also used in many models of dark matter and inflation/reheating. We investigate here a model of axion reheating with many axions and gauged dark sectors, in which we identify classes of axion reheatons that result in asymmetric reheating. In addition, a dark matter model composed of both ultralight axions and dark glueballs (bound states of dark gluons) is constructed, which displays unique phenomenology, given the "fuzzy" nature of the axions and the strong self-interactions of the glueballs. The formation of these dark glueballs often follows from a first-order confining phase transition, which is known to produce a gravitational wave signal. We end this dissertation by describing a phenomenological model of confinement that can estimate the intensity of this signal.
590 $a School code: 0160.
650 4 $a Physics. $3 516296
650 4 $a Theoretical physics. $3 2144760
653 $a Axion
653 $a Cosmology
653 $a Dark matter
653 $a Dark sector
653 $a Phenomenology
653 $a String theory
690 $a 0605
690 $a 0753
710 2 $a Northeastern University. $b Physics. $3 1025764
773 0 $t Dissertations Abstracts International $g 83-01B.
790 $a 0160
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28547569