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Beyond the Standard Model
Lecture 8
Leandar Litov
University of Sofia
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Strings
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ADS CFT duality
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Low energy string models
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BSM Conclusions
� The SM should be considered as a low energy effective model with many unsolved problems
� Values of couplings, masses and mixings
� The origin of electroweak symmetry breaking
� The fine-tuning problems
� Unification with quantum gravity
� The goal is to build a (high energy) model (theory) which explains the SM peculiarities and leads to the SM as a low energy limit
� GUT – unify strong and electro-weak interactions – many problems
� Conclusion from GUT – we have to include also in the game the properties of the space – time (i.e. what we call gravity)
� Supersymmetry
� Solves many of the problems of the SM
� Makes possible unification of all known forces
� MSSM – should be considered as an effective model (like SM)
� Predicts many new particles
� SUSY should be broken - the mechanism is not clear yet
� If exists – it should be in the reach of the LHC experiments
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� Extra dimensions
� KK – compactification – small R ~ MPl
� LED – the mater fields are localized on 3+1 brane – Ms ~ 1 TeV
� RS – model – warped extra dimensions - Ms ~ Mpl
� String models – pretend to build the true theory of everything ?
� Supersymmetric
� The space time has more then 4 dimensions
� Possible explanation of the SUSY breaking
� Very limited number of parameters
� To early to say, but I am not very big optimist
LHC – we are in front of very exciting new results – possibly we will be forced to change generally all our views about the Universe!!!
BSM Conclusions
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52525252The Big Quest
for secrets of the Universe
Starts 2007
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ReferencesTo prepare this slides I have used the excellent lectures by:
"Searching for Supersymmetry at the LHC (1/5)" by F. GIANOTTI (CERN-EP) and G. RIDOLFI (Univ. di Genova, Italy)
http://agenda.cern.ch/fullAgenda.php?ida=a032496
Physics beyond the Standard Model (1/5)" by L. Ibanez (CERN-PH)
http://agenda.cern.ch/fullAgenda.php?ida=a036621
"Beyond the Standard Model (1/4)" by Kiritsis, E (Ecole polytechnique CPHT, University of Crete )
http://agenda.cern.ch/fullAgenda.php?ida=a054074
"The Standard Model (8/8)" by Pich, A (IFIC; Universitat de Valencia )
http://agenda.cern.ch/fullAgenda.php?ida=a054062
String Theory (1/5)"by Johnson, C. (University of Southern California)
http://agenda.cern.ch/fullAgenda.php?ida=a044402
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