Thèses sur le sujet « Axion cosmology »
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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.
Texte intégralWantz, Olivier. « The instanton liquid and the axion ». Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/225235.
Texte intégralStewart, 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.
Texte intégralObata, Ippei. « Chiral Primordial Gravitational Waves Sourced by Axion-Gauge Couplings ». Kyoto University, 2018. http://hdl.handle.net/2433/232235.
Texte intégralBacchi, 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/.
Texte intégralKost, Jeffrey David, et 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.
Texte intégralDienes, Keith R., Jeff Kost et 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.
Texte intégralRamberg, 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.
Texte intégralElmer, Martin. « Nouvelle physique entre cosmologie et le LHC : axions, neutrinos et Z' ». Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10178/document.
Texte intégralDuring the three years as a PhD student I had the pleasure to work on three major projects which are united in the goal to better constrain new physics models between cosmology and the LHC. The similar values of dark matter and baryon relic abundances raise the question whether there is a link between them. We attempt to explain the observed values by relating leptogenesis to the WIMP miracle which gives naturally the right relic abundance. If the baryon asymmetry is produced in electroweak-scale-out-of-equilibrium decays and dark matter is made of WIMPs, both relic densities are controlled by electroweak scale interactions going out of equilibrium. We construct a TeV-scale leptogenesis model using an inverse-seesaw extension of the SM with additional singlets. To produce a large enough asymmetry we require CP violation ∼ O(1) which is difficult to achieve in our set-up. Axions as well as WIMPs are well motivated dark matter candidates. It would be very useful to be able to tell them apart. Sikivie argues that if axions are in a Bose-Einstein condensate they could form a different galactic dark matter halo than WIMPs and that gravitational interactions drive axions into a Bose-Einstein condensate. However for the formation of such a condensate entropy generation is needed which leading order gravitational interactions do not provide. We explore the entropy generation of gravitational interactions by estimating a dissipation scale in the axion fluid due to the presence of a anisotropic stress. We cannot confirm a fast gravitational thermalisation rate. New neutral gauge bosons like the Z' are generic extensions of the standard model which appear in many different models. Traditionally these particles are searched for in resonant searches at colliders, i.e. by producing the particles on-shell and looking for a resonance in the invariant mass spectrum of their decay products. However the presence of a Z' can also affect other kinematic observables without being actually produced on-shell, i.e. non-resonant searches. We compare compare resonant and non-resonant searches at the LHC and find that while for small couplings resonant searches are more sensitive, for larger couplings non-resonant searches are more efficient
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.
Texte intégralKlaer, Vincent Benedikt [Verfasser], Guy David [Akademischer Betreuer] Moore et 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.
Texte intégralKlaer, Vincent [Verfasser], Guy David [Akademischer Betreuer] Moore et 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.
Texte intégralKlaer, Vincent [Verfasser], Guy D. [Akademischer Betreuer] Moore et 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.
Texte intégralElmer, 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.
Texte intégralRighi, Nicole. « Fuzzy dark matter from string axions ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18010/.
Texte intégralMain, 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.
Texte intégralIn spite of the recent successes of observational cosmology, most of the universe remains poorly known. Known particles (which we call baryons) only make up 5% of the total content of the universe. The standard cosmological model contains two other components: Dark Energy and Dark Matter (respectively 70% and 25% of the total content). Dark Matter, which is generally believed to be a non-relativistic, charge neutral and non-baryonic new form of matter, is the central focus of this work. We studied two likely candidates, namely WIMPs and axions. Our analyses were carried out within the EDELWEISS collaboration which operates detectors sensitive to both WIMP and axion signals. Axions were first introduced to solve the strong CP problem. They can be produced in the Sun through a variety of processes and in some models, they may also contribute to the Dark Matter density. In this work, we used EDELWEISS data to search for axions through four distinct production-detection mechanisms. These mechanisms involve the coupling of axions to nucleons, photons and electrons. No excess over background was found. These null observations allowed us to set stringent constraints on the axion couplings and exclude several orders of magnitude of the axion mass within specific QCD axion models. On the other hand, WIMPs are the canonical dark matter candidate whose mass lies in the GeV-TeV range. With the motivation of recent theoretical developments and possible signal hints, we focused our effort on so-called low mass WIMPs (3 to 25 GeV). This thesis describes a new multivariate analysis specifically designed for this mass range, which we tuned using an unblinded fraction of the data set (35 kg.d) from a single EDELWEISS detector. No significant signal over background excess was found and we set an upper limit on the spin-independent WIMP-nucleon cross section of 1.48 × 10⁻⁶ pb at 10 GeV
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.
Texte intégralSanderson, Jennifer. « Aspects of hybrid inflation in supersymmetry ». Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299517.
Texte intégralWallisch, Benjamin. « Cosmological probes of light relics ». Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/283003.
Texte intégralFlauger, Raphael Manfred. « Constraining fundamental physics with cosmology ». 2009. http://hdl.handle.net/2152/6877.
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GIARE', WILLIAM. « Relics from the early universe : primordial rgavitational waves, axions and neutrinos ». Doctoral thesis, 2021. http://hdl.handle.net/11573/1610019.
Texte intégralKlaer, 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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