000168643 001__ 168643
000168643 005__ 20190509132410.0
000168643 0247_ $$2doi$$a10.5075/epfl-thesis-5189
000168643 02470 $$2urn$$aurn:nbn:ch:bel-epfl-thesis5189-2
000168643 02471 $$2nebis$$a6575769
000168643 037__ $$aTHESIS
000168643 041__ $$aeng
000168643 088__ $$a5189
000168643 245__ $$aTackling the Supersymmetric Flavour Problem in String Models
000168643 269__ $$a2011
000168643 260__ $$aLausanne$$bEPFL$$c2011
000168643 300__ $$a183
000168643 336__ $$aTheses
000168643 520__ $$aIn this work we address one of the phenomenological issues  of beyond the Standard Model scenarios which embed  Supersymmetry, namely the Supersymmetric Flavour Problem, in  the context of String Theory. Indeed, the addition of new  interactions to the Standard Model generically spoils its  flavour structure which is one of its major achievements  since it for example leads to a very elegant understanding of  the absence of flavour changing neutral currents in the  leptonic sector and of the stability of the proton, thanks to  accidental symmetries. We focus on a subset of the  phenomenologically dangerous operators, namely the soft  scalar masses. One way out of the Supersymmetric Flavour Problem is to  geographically separate the observable and hidden sectors  along a fifth dimension, gravity being the only interaction  propagating in the bulk. In such scenarios, the soft scalar  masses are vanishing at the classical level since there is no  direct contact term between the observable and hidden  multiplets and tend to be universal at the loop-level.  However such setups hardly ever come about in String Theory,  which is one of the most promising candidates of quantum  gravity. In order to make contact with the five-dimensional  picture, we focus on the prototypical case of the  E8 × E8 Heterotic  M-Theory which, in a certain regime, effectively looks  five-dimensional and embeds matter fields on two  end-of-the-world branes. In these scenarios, not only gravity  but also vector multiplets propagate in the five-dimensional  bulk, effectively spoiling the sequestered picture. However, since the contact terms responsible for the  appearance of soft scalar masses arise due to the exchange of  heavy vectors, they do enjoy a current-current structure  which can be exploited to inhibit the emergence of soft  scalar masses by postulating a global symmetry in the hidden  sector. In order to assess the possibility of realising such  a mechanism, we first study the full dependence of the  Kähler potential on both the moduli and the matter  fields in the case of orbifold and Calabi-Yau  compactifications. We then determine whether an effective  sequestering may be achieved thanks to a global symmetry and  argue that whereas for orbifold models our strategy can  naturally be put at work, it can only be implemented in a  subset of Calabi-Yau models.
000168643 6531_ $$aBeyond the Standard Model
000168643 6531_ $$aFlavour Structure
000168643 6531_ $$aSupersymmetry
000168643 6531_ $$aHidden Sector
000168643 6531_ $$aSoft Terms
000168643 6531_ $$aSupergravity
000168643 6531_ $$aString Theory
000168643 6531_ $$aHeterotic Superstring
000168643 6531_ $$aM- Theory
000168643 6531_ $$aSequestering
000168643 6531_ $$aOrbifold
000168643 6531_ $$aCalabi-Yau
000168643 6531_ $$aAu delà du Modèle Standard
000168643 6531_ $$aStructure de saveur
000168643 6531_ $$aSupersymétrie
000168643 6531_ $$aSecteur caché
000168643 6531_ $$aTermes soft
000168643 6531_ $$aSupergravité
000168643 6531_ $$aThéorie des cordes
000168643 6531_ $$aCorde hétérotique
000168643 6531_ $$aThéorie M
000168643 6531_ $$aSéquestration
000168643 6531_ $$aOrbifold
000168643 6531_ $$aCalabi-Yau
000168643 700__ $$0244579$$aAndrey, Christopher John$$g153320
000168643 720_2 $$0244581$$aScrucca, Claudio$$edir.$$g181759
000168643 8564_ $$s1354262$$uhttps://infoscience.epfl.ch/record/168643/files/EPFL_TH5189.pdf$$yTexte intégral / Full text$$zTexte intégral / Full text
000168643 909C0 $$0252314$$pGR-SC$$xU11777
000168643 909CO $$ooai:infoscience.tind.io:168643$$pthesis-bn2018$$pDOI$$pSB$$pthesis$$qDOI2$$qGLOBAL_SET
000168643 918__ $$aSB$$cITP$$dEDPY
000168643 919__ $$aGR-SC
000168643 920__ $$b2011
000168643 970__ $$a5189/THESES
000168643 973__ $$aEPFL$$sPUBLISHED
000168643 980__ $$aTHESIS