NUNC EST VACUUM

Between non-criticality and non-linearity

Coordinatore	ECOLE POLYTECHNIQUE    more  Organization address address: ROUTE DE SACLAY city: PALAISEAU postcode: 91128 contact info Titolo: Dr. Nome: Herve Cognome: Partouche Email: send email Telefono: +33 1 69 33 42 51 Fax: +33 1 69 33 49 49
Nazionalità Coordinatore	France [FR]
Totale costo	153˙777 €
EC contributo	153˙777 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2007-2-1-IEF
Funding Scheme	MC-IEF
Anno di inizio	2008
Periodo (anno-mese-giorno)	2008-09-01   -   2010-08-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	ECOLE POLYTECHNIQUE  Organization address address: ROUTE DE SACLAY city: PALAISEAU postcode: 91128 contact info Titolo: Dr. Nome: Herve Cognome: Partouche Email: send email Telefono: +33 1 69 33 42 51 Fax: +33 1 69 33 49 49	FR (PALAISEAU)	coordinator	0.00

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 Obiettivo del progetto (Objective)

'One of the central tasks of fundamental physics is to derive an effective description at low energy from a more fundamental theory. In particular, superstring theory includes a large number of aspects of particle physics and general relativity. In this context, one of the key points is the mechanism of supersymmetry breaking. Its effective description contains important conceptual and phenomenological difficulties. That’s why we propose to consider the effective action and vacuum structure of non-supersymmetric orientifold compactifications of Type IIB string theory. Two essential features appear when supersymmetry is broken on configurations of branes. A dilaton tadpole is generated and the broken supersymmetry is realized on the world-volume of the branes in a non-linear way. This non-linear supersymmetry provides a very powerful tool for computing the off-shell brane effective action. We propose in particular to use it in order to explore the Kahler potential of matter fields beyond its quadratic approximation. This will allow us to better understand the field redefinition and the mass spectrum of these chiral fields. A second essential step toward a better understanding of vacua with broken supersymmetry is the stabilization of the dilaton. Indeed, the presence of a dilaton tadpole on the disk indicates an instability. We analyze its resolution by considering non-critical backgrounds. Using exact boundary conformal field theory methods, we propose to compute in details the sphere and disk contributions to the scalar potential. They arise respectively from the effective central charge and from supersymmetry breaking terms. Evidences for the existence of non-supersymmetric vacua at a perturbative regime will then be studied. These two complementary approaches will then enable us to propose stable non-supersymmetric branes constructions reproducing the basic features of the standard model of particle physics.'