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Dissertations / Theses on the topic 'Cosmology. Particles (Nuclear physics)'

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Published: 4 June 2021

Last updated: 16 February 2022

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1

Nasri, Salah Schechter Joseph. "Neutrinos in particle physics and cosmology." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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2

Strobl, Karl. "Aspects of approximate symmetry in cosmology and nematic liquid crystals." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388483.

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3

Atkins, Michael. "Bounds on the effective theory of gravity in models of particle physics and cosmology." Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/47195/.

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The effective theory of gravity coupled to matter represents a fully consistent low energy theory of quantum gravity coupled to the known particles and forces of the standard model. In recent years this framework has been extensively used to make physical predictions of phenomena in high energy physics and cosmology. In this thesis we use theoretical tools and experimental data to place constraints on various popular models which utilise this framework. We speciffically derive unitarity bounds in grand unified theories, models of low scale quantum gravity, models with extra dimensions and mode

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4

Obousy, Richard K. Cleaver Gerald B. "Investigation into compactifed dimensions Casimir energies and phenomenological aspects /." Waco, Tex. : Baylor University, 2008. http://hdl.handle.net/2104/5261.

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5

Vertongen, Gilles. "The fall and rise of antimatter: probing leptogenesis and dark matter models." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210200.

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Big Bang Nucleosynthesis (BBN), together with the analyses of the Cosmic Microwave Background (CMB) anisotropies, confirm what our day to day experience of life attests :antimatter is far less present than matter in the Universe. In addition, these observables also permit to evaluate that there exists about one proton for every 10^{10} photons present in the Universe. This is in contradiction with expectations coming from the standard hot big bang, where no distinction between matter and antimatter is made, and where subsequent annihilations would lead to equal matter and antimatter contents,

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6

Damodaran, K. "Topological defects in cosmology and nuclear physics." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598261.

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This dissertation is concerned with topological defects that arise from symmetry breaking in the non-linear sigma model limits of scalar field theories. The nonlinear evolution of global topological defects in <I>O</I> (<I>N</I>) field theories provide a mechansims for sourcing hte cosmic microwave background (CMB) temperature anisotropy on the sky today. In these theories, <I>N </I>determines the type of defect based on the homotopy group of the underlying vacuum manifold. Additionally, in models of nuclear physics based on <I>SU </I>(2) gauge theories, π<SUB>3</SUB> defects can manifest them

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7

Lashkari, Nima. "Hagedorn transition cosmology." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32511.

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The substantial recent advances in early universe observational cosmology have confronted theoretical physics with a number of deep conceptual questions. The standard model of particle physics and its natural extensions have proven to be insufficient for explaining the recent observations. String theory as the main candidate for a complete theory of quantum gravity provides us with the possibility of resolving this discrepancy. In this dissertation, I begin by an overview of thermodynamics in string theor

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8

Firouzjahi, Hassan. "Brane world cosmology." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82871.

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Recently, the ideas of extra dimensions and brane world scenarios have captured considerable interest. The potential ability of these brane-based models to explain the gauge hierarchy problem and the cosmological constant problem has been examined in numerous recent papers (on these subjects). In the first part of this thesis we examine many aspects of warped brane world scenarios, focusing on the Randall-Sundrum model. We begin with the stability issue of the Randall-Sundrum model and its cosmological implications. We will specifically verify that the Randall-Sundrum scenario; once sta

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9

Karouby, Johanna. "Topics in early universe cosmology." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110537.

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The study of the Early Universe raises some of the most fundamental questions in theoretical physics. This thesis explores three main aspects of early universe cosmology. The first part discusses alternatives to the Big Bang scenario which is the current paradigm of cosmology. Namely, it discusses bouncing universe models where the initial Big Bang singularity is replaced by a finite size universe. After reviewing the necessary cosmology background in the introduction, we show a specific model of a bouncing universe that contains additional "Lee-Wick fields", partners to the standard fie

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10

Pagano, Michael. "21 cm cosmology of topological defects." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110543.

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Cosmic strings are linear concentrations of trapped energy produced throughsymmetry breaking processes of eld theory models. Though they can onlycontribute a maxiumum of 10 percent to structure formation they have beenshown to arise as a generic consequence of many inationary setups of supergravitymodels. In addition they provide another avenue to probe physicsbeyond the "Standard Model". Cosmic strings can intersect producing stringloops. These topological defects are formed at early times creating largeamounts of accretion and thus lead to large amounts of baryon overdensities.These baryonic

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11

Hoover, Douglas A. (Douglas Allan) 1979. "Inflation and quintessence in brane cosmology." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81342.

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We examine both quintessence and inflation within the brane-world picture, wherein the world is (4+d)-dimensional, and all standard model fields are trapped on the surface of a p-dimensional brane. We examine the situation where the inter-brane potential is dominated by the exchange of either a massless or a massive mode, for the case where the extra dimensions have the topology of a torus. In doing so, we find that neither potential is flat enough to allow for sufficient inflation. We will also propose a brane-based model where there are two large extra dimensions. In deriving the low-

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12

Shuhmaher, Natalia. "Aspects of cosmology from physics beyond the standard model." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18460.

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The interface of Cosmology and High Energy physics is a forefront area of research which is constantly undergoing development. This thesis makes various contributions to this endeavor. String-inspired cosmology is the subject of the first part of the thesis, where we propose both a new inflationary and a new alternative cosmological model. The second part of the thesis concentrates on the problems of integrating cosmology with particle physics beyond the Standard Model. Inspired by new opportunities due to stringy degrees of freedom, we propose a non-inflationary resolution of the entropy and

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13

Martineau, Patrick. "On particle production and brane cosmology." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80328.

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Particle production is examined within the context of brane cosmology. Non-perturbative formalisms are reviewed and employed to calculate particle number (or the energy density associated with such particles) produced in dynamical spacetimes arising from various brane configurations. Specifically, reheating from tachyon condensation, the quantum instability of a class of S-brane spacetimes, and particle production on an orbiting brane-antibrane system are investigated.

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14

Qureshi, Babar Ahmed. "Symmetries in noncommutative physics." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.

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15

Poletti, Stephen John. "Geometry, quantum field theory and quantum cosmology." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315921.

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16

Dorjkhaidav, Orlokh Stone Sheldon. "Upper limit for electron-positron decaying to neutral Lambda(baryon)-antineutral Lamba(baryon) cross section and R in the center-of-mass energy range from 11.230 to 11.382 GeV." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.

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17

Mudau, Lufuno Julia. "Emission of ³He ⁴He and ⁶He particles produce from the interaction of ¹²C with ⁹³Nb at 400 MeV incident energy." Thesis, University of the Western Cape, 2005. http://hdl.handle.net/11394/1903.

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Magister Scientiae - MSc<br>The inclusive double di®erential cross sections of 3He, 4He, and 6He par- ticles produced from the interaction of 12C with 93Nb at 400 MeV incident energy were extracted from the prescaled singles spectra which were mea- sured in conjunction with the correlation between 8Be fragments and ® par- ticles. A further aim of this project was to test the detector e±ciencies and energy calibrations by comparing the alpha and 8Be prescaled singles data with existing inclusive cross sections of the same reaction. The absolute cross sections of 3He and 6He fragments hav

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18

Patil, Subodh. "Enhanced symmetries, duality invariance and moduli stabilization in String Gas Cosmology." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18778.

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This manusript based thesis explores the consequences of string gas cosmology for the moduli problem in string theory. We compile three published papers which set up the formalism and technique of massless string gas cosmology as developed by the author in collaboration with Robert Brandenberger, and explores the consequences of such a framework for late time cosmology. We find that when consistently coupled to the massless background of string theory (given a fixed dilaton), a fluid of massless strings can stabilize all radial and shape moduli of a toroidal compactification of bosonic or hete

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19

Ellenburg, Michael Glen. "Massless particles in a class of field theories." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/28022.

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20

Walston, Sean Eric. "Heavy flavor decays of the Z⁰ and a search for flavor changing neutral currents /." wwwlib.umi.com/cr/uoregon/fullcit?p3136452 view abstract or download file of text, 2004.

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Thesis (Ph. D.)--University of Oregon, 2004.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 254-261). Also available for download via the World Wide Web; free to University of Oregon users.

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21

Eggers, Hans Christoph. "Intermittency, moments and correlations in distributions of particles created in high-energy collisions." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185422.

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Intermittency, as introduced into multiparticle production by Bialas and Peschanski, has become a fruitful and rapidly growing industry. The original concept of intermittency in the form of the Alpha model is discussed in detail and suggestions for extensions are made. We analyze the factorial moments measured by different experimental collaborations in terms of their nontrivial many-particle correlations, the cumulants. A large fraction of measured moments is shown to originate in two-particle correlations. The validity of the Linked Pair ansatz is tested and found to be acceptable to fourth

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22

Barros, Cristian Javier Caniu. "Alpha Particles in Effective Field Theory." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-13012015-131131/.

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In this thesis we work on the problem of the two-alpha-particle system using a halo/- cluster effective field theory (EFT). Our goal is to address the alpha-alpha scattering observables and its low-energy resonance identified as the ground state of Beryllium-8. In this work we start with an EFT in which the degrees of freedom are the alpha particles interacting via momentum-dependent contact forces. These, in contrast to forces that are energy-dependent, are more useful in extending the theory to systems with more than two alpha particles. Additionally, momentum-dependent forces allow us to ad

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23

Bissey, François René Pierre. "Structure functions in the three nucleon system /." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb6228.pdf.

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24

Kolb, Jeffrey A. "A search for neutrinoless tau decays to three leptons /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2008. http://hdl.handle.net/1794/8333.

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Thesis (Ph. D.)--University of Oregon, 2008.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 136-140). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.

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25

Karamov, Sergey Alexandrovich Catterall Simon. "Supersymmetric theories on the lattice." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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26

Emam, Waled S. Souder Paul. "A search for new physics at the TeV scale via a precise measurement of the weak mixing angle in Moller scattering." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.

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27

Kurkcuoglu, Seckin Balachandran A. P. "Explorations in fuzzy physics and non-commutative geometry." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.

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28

Vlcek, Brian J. "Beyond the standard model| Ihc phenomenology, cosmology from post-inflationary sources, and dark matter physics." Thesis, The University of Wisconsin - Milwaukee, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3613650.

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<p> It is the goal of this dissertation to demonstrate that beyond the standard model, certain theories exist which solve conflicts between observation and theory -- conflicts such as massive neutrinos, dark matter, unstable Higgs vacuum, and recent Planck observations of excess relativistic degrees of freedom in the early universe. Theories explored include a D-brane inspired construct of U(3) × Sp(1) × U(1) × U(1) extension of the standard model, in which we demonstrate several possible observables that may be detected at the LHC, and an ability to stabilize the Higgs mech

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29

Tonguc, Baris Tamer Souder Paul A. "A measurement of parity-violating asymmetry with polarized electrons scattered from protons and implications for strange form factors." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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30

Younus, Imran Souder Paul. "First observation of the parity violating asymmetry in Moller scattering." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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31

Muramatsu, Hajime Skwarnicki Tomasz. "Photon spectroscopy of heavy quarkonia." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.

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32

Cabrera, Palmer Belkis. "Supertubes, black strings and D-brane systems." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.

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33

Butt, Jamila Bashir. "First Observation of psi(3770) decays to photon chi(cJ)." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.

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34

Zhang, Hongshan (Kevin). "First measurements of the exclusive decays of the upsilon(5S) to B* meson B* bar meson pion pion final states and improved B*(s) meson mass measurements." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.

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35

Dujmić, Denis. "Open charm production at HERA-B." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3036594.

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36

Nisar, Shabana. "Branching fraction measurements and SU(3) diagrammatic analysis of Cabibbo-suppressed D meson decays." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2007. http://wwwlib.umi.com/cr/syr/main.

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37

Whittal, David Mark. "Quasifree knockout of charged particles from ⁴He with 100 MeV protons." Doctoral thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/17248.

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Bibliography p. 214-226.<br>Exclusive measurements have been made of the reactions ⁴He(p,2p ), (p,pd), (p,pt) and (p,ph) at 100 MeV. The primary protons were measured at two angles, 45° and 60°, in coincidence with secondary protons, deuterons, tritons or helions covering a wide range of angles on the opposite side of the beam, from -15° to -90° in plane, and from 0° to 30° out-of-plane. The purpose of the experiment was to explore the validity of the Distorted Wave Impulse Approximation (DWIA) as a description of these quasifree knockout reactions, at all geometries where the knockout cross s

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38

Frederiksen, Joorgen Segerlund. "Theoretical studies in high energy physics and atmospheric dynamics /." Title page, introduction and contents only, 1987. http://web4.library.adelaide.edu.au/theses/09SD/09sdf852.pdf.

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39

Ryan, Daniel Edward. "Direct searches for scalar leptoquarks at the Run II Tevatron /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2004.

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Thesis (Ph.D.)--Tufts University, 2004.<br>Adviser: Krzysztof Sliwa. Submitted to the Dept. of Physics. Includes bibliographical references (leaves 131-138). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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40

Thompson, David Ian. "Low energy consequences of some non-standard Higgs models." Connect to e-thesis, 2007. http://theses.gla.ac.uk/143/.

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Thesis (Ph.D.) - University of Glasgow, 2007.<br>Ph.D. thesis submitted to the Department of Physics and Astronomy, Faculty of Physical Sciences, University of Glasgow, 2007. Includes bibliographical references. Print version also available.

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41

Miletic, Tatjana Lane C. E. "Search for the disappearance of a neutron with KamLAND detector /." Philadelphia, Pa. : Drexel University, 2009. http://hdl.handle.net/1860/3129.

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42

Li, Yuan. "Triaxial strongly deformed band and high spin states in 168Lu." Master's thesis, Mississippi State : Mississippi State University, 2003. http://library.msstate.edu/etd/show.asp?etd=etd-03132003-141252.

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43

Day, Francesca. "Astrophysical signatures of axion-like particles." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:215f6432-6dbb-4a16-80d8-3ad0bc76ec2d.

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The Standard Model of particle physics has enjoyed unprecedented success in predicting experimental results. However, evidence from astrophysical observations points to the existence of a dark sector of particles that interact only very weakly with the Standard Model. In this work, we search for dark sector signatures in X-ray telescope data. Much of this work concerns a class of hypothetical particles, the axion-like particle (ALP). ALPs are a theoretically well-motivated extension of the Standard Model. If ALPs exist, they may lead to intriguing astrophysical signatures: in the presence of a

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44

Patel, Sunil. "A study of heavy quark production and semi-leptonic decay in deep-inelastic ep scattering at high energies." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670155.

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45

Striley, David L. "Large transverse momentum [pi]⁰ meson production by 0.5 TeV/c p, [pi]+ and K+ incident on beryllium /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9737874.

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46

Torres, Sergio. "Observation of K* (2060) in the [phi]K[pi] final state produced in proton-nuclei interactions at 400 GeV/c." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49943.

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In 1982 Fermilab experiment E623 took data in a search for high-mass boson resonances which decay into one or two ɸ mesons produced in 400 GeV/c proton-nuclei interactions. A hardware trigger selected 3.6 million events with identified K⁺K⁻ pairs. Here I report my study of events with ɸKπ in the final state and present the first evidence for K°*(2060) decaying into ɸKπ and ɸK°*(890).<br>Ph. D.<br>incomplete_metadata

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47

Pais, Preema R. "Reducing background in the t neutrino mass limiting decay t [plus or minus] --> K [plus or minus] Ks̳p0̳̳vt̳ /." Connect to online version, 2006. http://ada.mtholyoke.edu/setr/websrc/pdfs/www/2006/174.pdf.

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48

Porcelli, Tracy Ann. "Measurements of muon catalyzed dt fusion in solid HD." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ37360.pdf.

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49

Lepeintre, François. "Supersymmetric models of flavor /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/9699.

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50

Gammal, Arnaldo. "O Termo Sigma Nuclear no Modelo de Skyrme." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/43/43132/tde-04122013-164120/.

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O termo sigma nuclear (o conteúdo isoescalar de quarks do estado nuclear) é calculado no contexto do modelo de Skyrme, através da consideração da dependência do potencial núcleon-núcleon com as massas de corrente. O termo sigma nuclear é extraído da massa nuclear usando-se o teorema de Hellmann-Feynman, derivando a interação núcleon-núcleon com respeito às massas dos quarks up e down, m IND.q V IND.NN/ m IND.q. O potencial é construído na aproximação do ansatz produto quantizado no modelo de Skyrme. A dependência às massas dos quarks vem do termo relativo a massa do píon na Lagrangiana de Sky

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