8853

8214

كارشناسي ارشد

ذرات بنيادي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1392

هشت،86ص.: مصور،جدول،نمودار

ص.ع.به فارسي وانگليسي

احمد شيرزاد

بهروز ميرزا

20/2/93

منصور حقيقت، غلامرضا خسروي

فيزيك

ID8214

Bosonic string in a non flat background and time dependent B field Pedram Tavazohi p tavazohi@ph iut ac ir 13 01 2014 Department of Physics Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Ahmad Shirzad shirzad@ipm irAbstractIn recent years the non commutativity problem in the string theory has been controversial In orderto find non commutativity one should first quantize the theory and find the algebra between fields In this thesis we try to introduce and investigate the ordinary quatization methods and use them toquantize the bosonic string in a non flat background and time dependent B field that was providedby Nappi and Witten First we introduce the action that are used in string theory In Second chapter we introduce thesymmplectic quantization method Then by investigating the constraint structure we intent to providemode expansion for original fields In this procedure we explain important problems that one shouldobserve in order to provide a suitable mode expansion Then we try to find a mode expansion forNappi Witten model bosonic string in a non flat background and time dependent B field using la grangian approach This approach yields a time dependent Poisson bracket To give an alternativeapproach we investigate the constraint structure and symmetries of this model and by introducing twogauge fixing conditions we try to provide a suitable mode expansion Keywords Symplectic quantization Bosonic string in Blackground field non commutativity

احمد شيرزاد

بهروز ميرزا

منصور حقيقت، غلامرضا خسروي