Relevant bibliographies by topics / Axion cosmology / Dissertations / Theses
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Dissertations / Theses on the topic 'Axion cosmology'

Author: Grafiati
Published: 14 March 2023
Last updated: 31 July 2025

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1

Powell, Andrew James. "The cosmology and astrophysics of axion-like particles." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:bbbb3cbc-a0ba-4024-86b0-c720d8104270.

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In this thesis I study astrophysical and cosmological effects of axion-like particles (ALPs). ALPs are pseudo-scalar particles, which are generally very weakly-interacting, with a coupling α/M E · B to electromagnetism. They are predicted by many theories which extend the standard model (SM) of particle physics, most notably string theory. String theory compactifications also predict many scalar fields called moduli which describe the size and shape of the extra, compact dimensions. In string theory models generically the moduli fields are responsible for reheating the universe after inflation
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2

Wantz, Olivier. "The instanton liquid and the axion." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/225235.

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The ultimate goal of this thesis is to improve our understanding of the cosmology of axions. Axions couple to QCDinstantons and these non-perturbative effects are modeled within the framework of the interacting instanton liquid model (IILM). The thesis describes the significant advances made within the IILM in order to study the quark-gluon plasma in realistic parameter regimes. In particular, a determination of the temperature-dependent axion mass in the IILM lays the foundation for a critical reevaluation and update of present cosmological axion constraints. We develop grand canonical Monte
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3

Stewart, Ewan Davidson. "Axion cosmology : the behaviour of the Peccei-Quinn field during inflation." Thesis, Lancaster University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332083.

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4

Obata, Ippei. "Chiral Primordial Gravitational Waves Sourced by Axion-Gauge Couplings." Kyoto University, 2018. http://hdl.handle.net/2433/232235.

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5

Bacchi, Michael. "Chiral gravitational waves from axion-inflation models with step-like features." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24833/.

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Models with an axion-like inflaton have received considerable attention since the early 90’s, since pseudo-Nambu Goldstone bosons (pNGBs) have a radiatively stable potential and they are abundant in string theory. In these models, the inflaton can be coupled with a gauge field, leading to a rich phenomenology. The produced gauge quanta source the scalar and tensor components of the metric perturbations, with the latter giving rise to non-vanishing TB and EB correlation functions in the Cosmic Microwave Background (CMB), which can be detected by ongoing and future experiments. In this work, we
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6

Kost, Jeffrey David, and Jeffrey David Kost. "Phase Transitions in the Early Universe: The Cosmology of Non-minimal Scalar Sectors." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625467.

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Light scalar fields such as axions and string moduli can play an important role in early-universe cosmology. However, many factors can significantly impact their late-time cosmological abundances. For example, in cases where the potentials for these fields are generated dynamically --- such as during cosmological mass-generating phase transitions --- the duration of the time interval required for these potentials to fully develop can have significant repercussions. Likewise, in scenarios with multiple scalars, mixing amongst the fields can also give rise to an effective timescale that modifies
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7

Dienes, Keith R., Jeff Kost, and Brooks Thomas. "Kaluza-Klein towers in the early universe: Phase transitions, relic abundances, and applications to axion cosmology." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/624934.

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We study the early-universe cosmology of a Kaluza-Klein (KK) tower of scalar fields in the presence of a mass-generating phase transition, focusing on the time development of the total tower energy density (or relic abundance) as well as its distribution across the different KK modes. We find that both of these features are extremely sensitive to the details of the phase transition and can behave in a variety of ways significant for late-time cosmology. In particular, we find that the interplay between the temporal properties of the phase transition and the mixing it generates are responsible
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8

Grilli, di Cortona Giovanni. "Phenomenology of dark matter at present and future experiments." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4901.

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In this thesis we present a study of two different dark matter candidates. We focus on the neutralino in split supersymmetric models and in models of Dirac gauginos, and on the QCD axion. In the first part of the thesis we discuss supersymmetric searches at future hadron colliders and dark matter direct detection experiments. We obtain mass reach for several simplified models in split supersymmetry with neutralino or gravitino lightest supersymmetric particle at 14, 33 and 100 TeV collider. In particular, a supersymmetric simplified model of anomaly mediation with long lived Winos has cruci
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9

Ramberg, Nicklas. "Cosmological probes of the early universe with Axions & Gravitational Waves." Thesis, Uppsala universitet, Teoretisk fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394014.

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This thesis uses theoretical studies, and numerical simulations to provide results of the experimental reach to detect the QCD axion as dark matter in a Non-standard cosmological background. Assuming that the QCD axion constitutes the full CDM abundance of the universe, this thesis elaborates on its potential detection from experimental setups for the mass window of the axion. The set of results that is obtained here are the relic CDM energy density of axions produced by the vacuum realignment mechanism and the CDM energy density of axions produced from the decay of a network of cosmic strings
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10

Elmer, Martin. "Nouvelle physique entre cosmologie et le LHC : axions, neutrinos et Z'." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10178/document.

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Pendant mes trois ans de doctorat j'ai eu le plaisir de travailler sur trois projets très variés ayant un but commun: mieux contraindre certains modèles de nouvelle physique entre cosmolo- gie et le LHC. Le fait que les densités reliques de matière noire et de baryons sont similaires semble indiquer qu'il y a un lien entre les deux. Nous essayons d'expliquer les valeurs observées en reliant un modèle de leptogenèse au miracle des WIMPs, qui produit naturellement la bonne densité relique. Si l'asymétrie baryonique est produit dans des désintégrations hors équilibre à l'échelle électro-faible et
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11

Pierpoint, Michael P. "From general relativity, to axionic-dark-matter-induced inflationary cosmology, and holographic graphene." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17191.

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This thesis explores the expansive world of General Relativity, and its role to play in modern cosmology and quantum field theory. We begin with a pedagogical approach to relativity, in particular, highlighting upon the ambiguity that arises with the conventions used in different textbooks. A brief introduction to tensor calculus has also been provided in the appendix. The preliminary chapters are also complimented with examples of numerical relativity via simulation. We then move on to discuss examples of non-linear systems, and their exact solutions. Such systems will be analogous to those w
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12

Klaer, Vincent Benedikt [Verfasser], Guy David [Akademischer Betreuer] Moore, and Tetyana [Akademischer Betreuer] Galatyuk. "Axions, Strings, and Dark-Matter Cosmology / Vincent Benedikt Klaer ; Guy David Moore, Tetyana Galatyuk." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1201086760/34.

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13

Klaer, Vincent [Verfasser], Guy David [Akademischer Betreuer] Moore, and Tetyana [Akademischer Betreuer] Galatyuk. "Axions, Strings, and Dark-Matter Cosmology / Vincent Benedikt Klaer ; Guy David Moore, Tetyana Galatyuk." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1201086760/34.

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14

Klaer, Vincent [Verfasser], Guy D. [Akademischer Betreuer] Moore, and Tetyana [Akademischer Betreuer] Galatyuk. "Axions, Strings, and Dark-Matter Cosmology / Vincent Benedikt Klaer ; Guy David Moore, Tetyana Galatyuk." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1201086760/34.

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15

Elmer, M. "Nouvelle physique entre Cosmologie et le LHC : Axions, Neutrinos et Z'." Phd thesis, Université Claude Bernard - Lyon I, 2014. http://tel.archives-ouvertes.fr/tel-01071269.

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Pendant mes trois ans de doctorat j'ai eu le plaisir de travailler sur trois projets très variés ayant un but commun: mieux contraindre certains modèles de nouvelle physique entre cosmologie et le LHC. Le fait que les densités reliques de matière noire et de baryons sont similaires semble indiquer qu'il y a un lien entre les deux. Nous essayons d'expliquer les valeurs observées en reliant un modèle de leptogenèse au miracle des WIMPs, qui produit naturellement la bonne densité relique. Si l'asymétrie baryonique est produit dans des désintégrations hors équilibre à l'échelle électro-faible et s
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16

Righi, Nicole. "Fuzzy dark matter from string axions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18010/.

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In this thesis we study the viability for ultra-light axions coming from moduli stabilisation in the Large volume scenario to fit recent observations about the dark matter presence in several galaxies and clusters. After a historical introduction on the dark matter problem and a review of the candidates proposed as dark matter constituents through the years, in Chapter 1 we present WIMPs and ALPs, which are nowadays believed to be the most likely constituents. In Chapter 2 we give the theoretical basis to analyse these particles, that is Supersymmetry and String theory, focusing especially on
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17

Main, de Boissière Thibault. "Recherches de WIMPs de basse masse et d'axions avec l'expérience EDELWEISS." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112117/document.

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En dépit des récents succès de la cosmologie observationnelle, la majeure partie de l'univers demeure méconnue: la matière usuelle, dite baryonique, ne représente que 5% du contenu total de l'univers. Dans le modèle cosmologique standard, deux autres composantes complètent notre description: l'énergie noire et la matière noire (respectivement 70% et 25% du contenu total). Dans cette thèse, nous nous intéressons à la matière noire, une nouvelle forme de matière qui doit être non-relativiste, non-baryonique et neutre de charge. Nous avons étudié deux candidats : les WIMPs et les axions. Toutes n
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18

Angus, Stephen Andrew. "Phenomenology of dark radiation and string compactifications." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:739ffcb2-bf9d-4fd3-8d6c-911d2d599f5e.

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In this Thesis I explore aspects of dark radiation and its role in String Phenomenology. Dark radiation is any additional hidden type of relativistic matter present in the Universe today, conventionally labelled as an "excess effective number of neutrino species", &Delta; N<sub>eff</sub>. It provides a powerful test of hitherto untested theoretical models based on fundamental theories such as String Theory. I begin by considering dark radiation in the LARGE Volume Scenario, a phenomenologically viable class of string compactifications. First I review how the minimal setup slightly overproduces
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19

Sanderson, Jennifer. "Aspects of hybrid inflation in supersymmetry." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299517.

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20

Wallisch, Benjamin. "Cosmological probes of light relics." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/283003.

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One of the primary targets of current and especially future cosmological observations are light thermal relics of the hot big bang. Within the Standard Model of particle physics, an important thermal relic are cosmic neutrinos, while many interesting extensions of the Standard Model predict new light particles which are even more weakly coupled to ordinary matter and therefore hard to detect in terrestrial experiments. On the other hand, these elusive particles may be produced efficiently in the early universe and their gravitational influence could be detectable in cosmological observables. I
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21

Flauger, Raphael Manfred. "Constraining fundamental physics with cosmology." 2009. http://hdl.handle.net/2152/6877.

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It is shown in three examples that future cosmological data may allow us to constrain fundamental physics in interesting ways. The first example illustrates that correlations in the polarization of the cosmic microwave background may allow us to put the strongest limit yet on the mass of a particle, the graviton, at a level of m . 10−30 eV. In the second example, it is shown that observations of the correlations of temperature anisotropies and polarization of the cosmic microwave background may reveal hints for the realization of a class of string theoretic inflationary models that go by the n
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22

GIARE', WILLIAM. "Relics from the early universe: primordial rgavitational waves, axions and neutrinos." Doctoral thesis, 2021. http://hdl.handle.net/11573/1610019.

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Over the last decades our knowledge of the Universe has reached an unprecedented level of accuracy. The observations of the Cosmic Microwave Background and the large scale structure of the Universe opened the so-called epoch of precise cosmology, enabling us to test with increasing precision several aspects of fundamental physics, from the first principles of the cosmological model to global theoretical scenarios beyond General Relativity and the Standard Model of elementary particles. The research subject of this PhD thesis goes exactly in this direction: working at the interface of cosmology
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23

Klaer, Vincent Benedikt. "Axions, Strings, and Dark-Matter Cosmology." Phd thesis, 2019. https://tuprints.ulb.tu-darmstadt.de/9457/7/Dissertation_Klaer_v2.pdf.

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The existence of dark matter is one of the unsolved fundamental problems of physics and cannot be explained by established theories such as general relativity or the standard model of particle physics. However, an extension of Quantum Chromodynamics (QCD), a part of the Standard Model, can explain dark matter. It is known that QCD is invariant under charge and parity symmetry (CP symmetry), the violation of symmetry is quantified by the parameter theta. The invariance of the QCD under CP transformations is not explicitly required, but only implicitly fulfilled by a very small theta parameter.
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