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Dissertations / Theses on the topic 'Grand Unified Theories (GUT)'

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Published: 4 June 2021

Last updated: 6 September 2023

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1

McDonald, J. "Aspects of supersymmetric grand unified theories." Thesis, University of Sussex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372726.

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2

Torrejón, Maguiña Miguel Ángel. "Symmetry breaking in grand unified theories." Master's thesis, Pontificia Universidad Católica del Perú, 2014. http://tesis.pucp.edu.pe/repositorio/handle/123456789/6714.

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In this work we review the symmetry breaking mechanism of gauge theories. On the first chapters of this thesis, we review the concept of symmetry as the action of a group that leaves an object invariant, in particular Lagrangians and actions, and then develop the corresponding globally and gauge symmetric theories and the relationship between them. It also reviewed the concept and general framework of the spontaneous breaking of a symmetry for renormalizable potentials. Correspondingly, two main results for global symmetries, Noether’s theorem and Goldstone’s Theorem, are reviewed in a general

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3

DermÃsÌ†ek, Radovan. "SO(10) supersymmetric grand unified theories /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486461246816545.

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4

Ziegler, Robert. "Supersymmetry Breaking in Grand Unified Theories." Doctoral thesis, SISSA, 2010. http://hdl.handle.net/20.500.11767/4496.

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Supersymmetric grand unified theories (SUSY GUTs) are very interesting extensions of the minimal supersymmetric standard model (MSSM). They unify strong and electroweak interactions explaining the MSSM quantum numbers, account for presicion gauge coupling unification and stabilize the weak scale. Most importantly, they make remarkable predictions that allow to test them experimentally......

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5

Pernow, Marcus. "Phenomenology of SO(10) Grand Unified Theories." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259605.

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Although the Standard Model (SM) of particle physics describes observations well, there are several shortcomings of it. The most crucial of these are that the SM cannot explain the origin of neutrino masses and the existence of dark matter. Furthermore, there are several aspects of it that are seemingly ad hoc, such as the choice of gauge group and the cancellation of gauge anomalies. These shortcomings point to a theory beyond the SM. Although there are many proposed models for physics beyond the SM, in this thesis, we focus on grand unified theories based on the SO(10) gauge group. It predic

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6

Sönnerlind, Erik. "Threshold Effects in SO(10) Grand Unified Theories." Thesis, KTH, Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277788.

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7

Lindestam, Malte. "Flavour Symmetries in SU(5) Grand Unified Theories." Thesis, KTH, Fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297790.

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The current description of physics on the very smallest scales is given by the standard model (SM) of particle physics. It makes many good predictions and is a highly successful theory. There are however phenomena it cannot explain, and it is therefore not a complete theory of particle physics. Current efforts within theoretical particle physics are focused on theories beyond the SM which may amend its shortcomings. The SM also has aesthetic problems, in that several of its features can be seen as unnatural. There are unexplained patterns in measured masses and mixing parameters, and the fact

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8

Di, Luzio Luca. "Aspects of symmetry breaking in grand unified theories." Doctoral thesis, SISSA, 2011. http://hdl.handle.net/20.500.11767/4689.

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9

Walker, Joel Wesley. "Aspects of grand unified and string phenomenology." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2622.

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Explored in this report is the essential interconnectedness of Grand Unified and String Theoretic Phenomenology. In order to extract a modeled connection to low-energy physics from the context of superstring theory, it is presently necessary to input some preferred region of parameter space in which to search. This need may be well filled by a parallel study of Grand Unification, which is by contrast in immediate proximity to a wealth of experimental data. The favored GUT so isolated may then reasonably transfer this phenomenological correlation to a string embedding, receiving back by way of

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10

Bhatti, Abdul Aziz. "Fermion masses and Higgs Physics in Grand Unified Theories." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-114132.

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11

Lanzagorta, Marco. "Infra-red fixed points in supersymmetric Grand Unified theories." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318836.

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12

Davis, S. C. "Microphysics of cosmic strings in supersymmetric and grand unified theories." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598393.

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In this thesis we investigate the microphysics of cosmic strings in non-minimal quantum field theories. In particular we consider theories in which fermion fields couple to the strings, and those with larger symmetry groups, such as grand unified and supersymmetric theories. By considering these extensions to the minimal model, we obtain a more realistic picture of the properties of cosmic strings. In considering grand unified theories, which have multiple phase transitions, we show that a cosmic string formed at one phase transition can cause the creation of another string-line solution at a

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13

Martens, Waldemar [Verfasser], and M. [Akademischer Betreuer] Steinhauser. "Threshold Corrections in Grand Unified Theories / Waldemar Martens. Betreuer: M. Steinhauser." Karlsruhe : KIT-Bibliothek, 2011. http://d-nb.info/1014279631/34.

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14

Blazek, Tomás. "Supersymmetric grand unified theories and global fits to low energy data /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487940665437557.

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15

Malinsky, Michal. "Quark and Lepton Masses and Mixing in Supersymmetric Grand Unified Theories." Doctoral thesis, SISSA, 2005. http://hdl.handle.net/20.500.11767/4198.

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The material is organized as follows: the first chapter is devoted to several remarks on the two basic supersymmetric GUTs - first the minimal SUSY SU(5) is considered and the main shortcomings are pointed-out in brief, and in the second part these issues are addressed concerning a general class of SO(lO) models. This provides a natural motivation to approach and describe shortly the minimal SUSY SO(lO) scheme in the second chapter. The third chapter is dedicated to a detailed study of the correlations among the quark and lepton masses and mixing within the framework with dominant tripl

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16

Dundee, G. Benjamin (George Benjamin) Cleaver Gerald B. "Grand unified theories in higher dimensions : from the heterotic string to Randall-Sundrum /." Waco, Tex. : Baylor University, 2006. http://hdl.handle.net/2104/4905.

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17

Kapner, Daniel J. "A short-range test of Newton's gravitational inverse-square law /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9694.

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18

Cooney, Paul. "Proton decay matrix elements from lattice QCD." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4042.

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We present results for the matrix elements relevant for proton decay in Grand Unified Theories (GUTs), using two methods. In the indirect method, we rely on an effective field theory description of proton decay, where we need to estimate two low energy constants. We then relate these low energy constants to the proton decay matrix elements using leading order chiral perturbation theory. In the direct method, we calculate the required matrix elements directly; this is computationally more expensive, but the calculation has no systematic error from the use of chiral perturbation theory. The calc

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19

Jansson, Henrik. "Unification in Particle Physics." Thesis, Uppsala universitet, Högenergifysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295813.

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During the twentieth century, particle physics developed into a cornerstone of modern physics, culminating in the Standard Model. Even though this theory has proved to be of extraordinary power, it is still incomplete in several respects. It is our aim in this bachelor thesis to discuss some possible theories beyond the Standard Model, the main focus being on Grand Unified Theories, while also taking a look at attempts of further unication via discrete family symmetry. At the heart of all these theories lies the concept of local gauge invariance, which is introduced as a fundamental principle,

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20

Senoguz, Vedat Nefer. "Aspects of inflationary models and unification." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 114 p, 2007. http://proquest.umi.com/pqdweb?did=1251906411&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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21

Schreiber, Gunhild Ursula. "Introduction to supersymmetry." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/14358.

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Includes bibliographical references.<br>The tendency in theoretical physics, particularly in the past few decades, has been towards unification: over the years it has emerged that increasingly many physical phenomena can be explained by a common underlying theory. Symmetry principles, both global and local, play an important role in this unification programme. Global symmetries often account for approximate regularities we observe in nature - local or gauge symmetries are understood as basic symmetries which lie at the heart of the interactions of the constituents of matter.

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22

Riad, Stella. "Studies of effective theories beyond the Standard Model." Licentiate thesis, KTH, Teoretisk partikelfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154048.

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The vast majority of all experimental results in particle physics can be described by the Standard Model (SM) of particle physics. However, neither the existence of neutrino masses nor the mixing in the leptonic sector, which have been observed, can be described within this model. In fact, the model only describes a fraction of the known energy in the Universe. Thus, we know there must exist a theory beyond the SM. There is a plethora of possible candidates for such a model, such as supersymmetry, extra dimensional theories, and string theory. So far, there are no evidence in favor of these mo

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23

Riad, Stella. "Phenomenology of neutrino properties, unification, and Higgs couplings beyond the Standard Model." Doctoral thesis, KTH, Teoretisk partikelfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202311.

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The vast majority of experiments in particle physics can be described by the Standard Model of particle physics (SM). However, there are indications for physics beyond it. The only experimentally demonstrated problem of the model is the difficulty to describe neutrino masses and leptonic mixing. There is a plethora of models that try to describe these phenomena and this thesis investigates several possibilities for new models, both full theories and effective frameworks. The values of the parameters in a model are dependent on the energy scale and we say that the parameters run. The exact be

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24

Schradin, Leslie J. "Textures, model building, and orbifold gauge anomalies research in three topics in physics beyond the standard model /." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1166571116.

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25

Elgammal, Sherif. "Detection of high energy electrons in the CMS detector at the LHC." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210208.

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Détection et identification de la réaction quark + anti-quark -> e+ + e- à l'aide du détecteur CMS (Compact Muon Solenoid) auprès du Grand Collisionneur de Hadrons du CERN, le LHC. Cette réaction permet de tester avec précision le Modèle Standard et de rechercher d'éventuelles nouvelles particules (Z') prédites par les théories de grande unification (GUT) et par les modèles à dimensions spatiales supplémentaires.<br>Doctorat en Sciences<br>info:eu-repo/semantics/nonPublished

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26

Charaf, Otman. "Study of Drell-Yan production in the di-electron decay channel and search for new physics at the LHC." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210031.

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Cette these a pour sujet la recherche de nouvelle physique et l'etude de la production Drell-Yan dans le canal di-electron a l'aide du detecteur CMS au LHC. Certaines theories au dela du Modele Standard (extra dimensions, theories de grande unification) predisent l'existence de particules massives pouvant se desintegrer en une paire d'electrons. La selection des evenements recherches est presentee et etudiee. La strategie d'analyse est introduite et testee. Enfin, l'analyse des premieres donnees a 7 TeV est decrite et les resultats sont commentes.<br>Doctorat en Sciences<br>info:eu-repo/semant

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27

Thomas, Laurent. "Search for new heavy narrow resonances decaying into a dielectron pair with the CMS detector." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209221.

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Le sujet de la présente thèse porte sur la recherche de nouvelles particules très massives se désintégrant en une paire électron-positron avec le détecteur CMS.<p>Le démarrage en 2010 du Large Hadron Collider au CERN marque le début d'une nouvelle ère en physique des particules. L'énergie et l'intensité de ses faisceaux de protons, inégalées à ce jour, offre en effet la possibilité d'étudier les lois décrivant les constituants ultimes de la matière et leurs interactions à des énergies jusqu'alors inaccessibles et d'étudier des processus rares. <p>La découverte récente par les expériences ATLAS

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28

Cosme, Nicolas. "Matter asymmetry and gauge unification." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211132.

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Pourquoi reste-t-il de la matière dans l’univers ?Depuis la découverte de l’anti-matière, miroir de la matière dont nous sommes constitués et s’annihilant de prime abord parfaitement avec cette dernière, ce mystère stimule l’étude des propriétés communes et distinctes entre particules et anti-particules.<p><p>Dans ce cadre, il a été établi au vu des interactions dites de jauge (en particulier les interactions électrofaibles) que la symétrie intrinsèque entre particules et anti-particules est la combinaison subtile du conjugué de charge (C) et de la parité d’espace (P) :la symétrie CP. Ainsi, u

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29

Ohmann, Paul R. "Phenomenology of supersymmetric grand unified theories." 1994. http://catalog.hathitrust.org/api/volumes/oclc/32026904.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1994.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leave 152-167).

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30

Datta, Alakabha. "Topics in heavy flavor decays and grand unified theories." Thesis, 1995. http://hdl.handle.net/10125/10086.

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31

Summy, Heaya Ann. "SO(10) supersymmetric grand unified theories from cosmology to colliders /." 2008. http://etd.lib.fsu.edu/theses/available/etd-11042008-143042.

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Thesis (Ph. D.)--Florida State University, 2008.<br>Advisor: Howard Baer, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed Feb. 3, 2009). Document formatted into pages; contains xiii, 108 pages. Includes bibliographical references.

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32

Iyer, Abhishek Muralidhar. "Randall-Sundrum Model as a Theory of Flavour." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3381.

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The discovery of the Higgs boson by the LHC provided the last piece of the puzzle neces- sary for the Standard Model (SM) to be a successful theory of electroweak scale physics. However there exist various phenomenological reasons which serve as pointer towards the existence of physics beyond the Standard Model. For example the explanation for the smallness of the neutrino mass, baryon asymmetry of the universe, the presence of dark matter and dark energy etc. are not within purview of the Standard Model. Con- ceptual issues like the gauge hierarchy problem, weakness of gravity provide some of

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33

Iyer, Abhishek Muralidhar. "Randall-Sundrum Model as a Theory of Flavour." Thesis, 2013. http://etd.iisc.ernet.in/2005/3381.

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The discovery of the Higgs boson by the LHC provided the last piece of the puzzle neces- sary for the Standard Model (SM) to be a successful theory of electroweak scale physics. However there exist various phenomenological reasons which serve as pointer towards the existence of physics beyond the Standard Model. For example the explanation for the smallness of the neutrino mass, baryon asymmetry of the universe, the presence of dark matter and dark energy etc. are not within purview of the Standard Model. Con- ceptual issues like the gauge hierarchy problem, weakness of gravity provide some of

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34

Bhatti, Abdul Aziz [Verfasser]. "Fermion masses and Higgs physics in grand unified theories / submitted by Abdul Aziz Bhatti." 2010. http://d-nb.info/1002224055/34.

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35

Auto, Daniel M. Baer Howard A. "Yukawa unification in SO(10) SUSY GUTs." 2004. http://etd.lib.fsu.edu/theses/available/etd-11152004-160708.

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Thesis (Ph. D.)--Florida State University, 2004.<br>Advisor: Dr. Howard Baer, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed Jan 13, 2005). Includes bibliographical references.

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36

Fogel, D. Brandon. "Epistemology of a theory of everything Weyl, Einstein, and the unification of physics /." 2008. http://etd.nd.edu/ETD-db/theses/available/etd-04152008-120959/.

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Thesis (Ph. D.)--University of Notre Dame, 2008.<br>Thesis directed by Don Howard for the Graduate Program in History and Philosophy of Science. "April 2008." Includes bibliographical references (leaves 212-220).

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37

Dell'Aquila, Eleonora. "Phases of supersymmetric gauge theories and galois invariants." 2007. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.13457.

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38

Patra, Monalisa. "Topics in the Exploration of New Physics at the International Linear Collider with the inclusion of Beam Polarization." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3326.

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The Standard Model of particle physics which attempts to describe all matter and all forces in the universe (except gravity),has been in agreement with most of the experiments till date. However theoretically and phenomenologically many questions remain unanswered in the SM. The present and future colliders will help the physicists learn more about the nature of matter and all forces in the universe. In this thesis work we have mainly focused on the physics case of the future linear collider which will be a succession of the presently running Large Hadron Collider in CERN Geneva. As an introd

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39

Patra, Monalisa. "Topics in the Exploration of New Physics at the International Linear Collider with the inclusion of Beam Polarization." Thesis, 2013. http://etd.iisc.ernet.in/2005/3326.

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The Standard Model of particle physics which attempts to describe all matter and all forces in the universe (except gravity),has been in agreement with most of the experiments till date. However theoretically and phenomenologically many questions remain unanswered in the SM. The present and future colliders will help the physicists learn more about the nature of matter and all forces in the universe. In this thesis work we have mainly focused on the physics case of the future linear collider which will be a succession of the presently running Large Hadron Collider in CERN Geneva. As an introd

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40

Gráf, Lukáš. "Kvantové aspekty teorií velkého sjednocení." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-341233.

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In this thesis we focus on Grand Unified Theories based on the SO(10) gauge group and, in particular, on the viability of the minimal nonsupersymmetric SO(10) models. Technically, this amounts to a detailed assessment of their vac- uum stability and related (non-)tachyonicity of their scalar spectrum. It turns out that the one-loop scalar mass corrections are important for elimination of the tachyonic behaviour of certain pseudo-Goldstone bosons. In this work these issues are briefly reviewed and two distinct methods for the calculation of the critical radiative corrections are discussed. More

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41

Jarkovská, Kateřina. "Pseudo-Goldstoneovy bosony v teoriích velkého sjednocení částicových interakcí." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-383185.

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The minimal renormalizable SO(10) Higgs model with the unified gauge sym- metry broken down by the adjoint representation 45S is known to suffer from tachyonic instabilities along all potentially realistic symmetry breaking chains. Few years ago, this issue has been identified as a mere relic of the tree-level cal- culations and the radiative corrections to the masses of the pair of the "most dangerous" pseudo-Goldstone scalars transforming as (8, 1, 0) and (1, 3, 0) with respect to the SU(3)c × SU(2)L × U(1)Y Standard model gauge group were com- puted. Remarkably enough, it turns out that in

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42

Iskrzyński, Mateusz. "Yukawa matrix unification in the Minimal Supersymmetric Standard Model." Doctoral thesis, 2015. https://depotuw.ceon.pl/handle/item/1253.

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In this dissertation, the Minimal Supersymmetric Standard Model (MSSM) is studied as a low-energy theory stemming from the SU(5) Grand Unified Theory (GUT). The well-known gauge coupling unification in the MSSM is considered to be one of the main virtues of the model. Similarly, Yukawa couplings of the bottom quark and tau lepton become relatively close to each other at the GUT scale M_GUT ~ 2 x 10^16 GeV. However, it is not the case for the first- and second-generation Yukawa couplings, unless large threshold corrections arise at the scale at which the superpartners are being decoupled. Here,

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43

Kushwaha, Ashwani. "Novel Pathways for Beyond Standard Model Physics." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5209.

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In the light of discovering the Higgs boson and null results at the LHC, we look for new pathways for Beyond Standard Model Physics, which could accommodate at least one of the Standard Model shortcomings. (i) Unification with Vector like particles. We look for minimal extensions of the Standard Model with Vector like fermions leading to precision perturbative unification of gauge couplings. Constraints from proton decay and Higgs stability are considered. The minimal models require two different incomplete representations (under SU(5)) of fermions. All of them contain coloured vector fe

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