5973

5582

كارشناسي ارشد

ذرات بنيادي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1389

[هشت]،67ص.: جدول

ص.ع.به فارسي انگليسي

منصور حقيقت

فرهنگ لران

8/3/90

بهروز ميرزا، مسلم زارعي

فيزيك

ID5582

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Lorentz Violation Coefficients in NCQED Sarah Aghababaei s aghababaei@ph iut ac ir Date of Submission 1 10 2011 Department of Physic Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mansour HaghighatAbstractIn this thesis at first we introduce Lorentz and CPT symmetries that are exact symmetries ofnature and then we explain about Lorentz symmetry violation as a signature of Planck Scale Weintroduce a suitable frame for spontaneous symmetry breaking of Lorentz violation that is calledStandard Model Extension SME The Standard Model Extension provides a quantitativedescription of the Lorentz and CPT violation that intern is controlled by a set of coefficientswhose the values are to be constrained by experiments Einstein s special relativity violation isexplained in the quantum electrodynamics sector of SME We focus on this sector and study theexperiments which are performed in this area Consequently we investigate non commutativetheory including Lorentz Violation with Weyl Moyal formalism and its capabilities The theorythat is constructed only with Weyl Moyal formalism suffers from some major problems that wereview some of them Hence non commutative theory can be constructed in two differentapproaches In the first one the non commutative fields are the same as the ordinary ones whilethe gauge group is restricted to U n For example the symmetry group of the standard model inthe non commutative space is U 3 2 U 1 which can be reduced to SU 3 SU 2 U 1 by twoappropriate spontaneous symmetry breaking In contrast in the second approach the non commutative gauge theory can be constructed for SU n gauge group via Seiberg Witten map Since the non commutative theory has Lorentz violation it can be considered as a subset of theStandard Model Extension Subsequently we derive and determine the relation of the non commutative parameter with the Lorentz violation parameters for the two approaches andcompare the obtained results For example in the first approach there are a c and kF Lorentzviolation coefficients while only c and kF are nonzero in the second one At the end we obtainnew limits on the non commutative parameter by using the existing bounds on the LorentzViolation parameters For instance by using the existing bounds on the Lorentz violationcoefficient c we find a bound as high as 22 TeV on the non commutative parameter Keywords Lorentz symmetry violation Standard Model Extension Non Commutative theory Seiberg Witten map

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فرهنگ لران

بهروز ميرزا، مسلم زارعي