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Theoretical Elementary Particle Physics

The Institute of Nuclear Physics is active in two general categories in Elementary Particle Physics theory.

The one belongs to the domain of phenomenology and involves calculations of probabilities for interactions between elementary particles and also the construction of Monte Carlo programs to automate the description of processes at an elementary constituent (parton) level.

The second category includes the research efforts into the so called Unified Theories, which are theories allowing the unification of all known interactions (gravitational, strong, weak and electromagnetic). These theories can solve the problems and answer the questions that the Standard Model, the prevalent theory, cannot deal with. This does not mean that the Standard Model is not correct but it is a special case of a more general theory.

Standard Model

 

The activities of the Theory group of I.N.P. in phenomenology and the applications and tests of the Standard Model of Particle Physics include:

Calculations of probabilities for interactions between elementary particles and production of various final states (fermions, jets, Higgs particles, etc).

Development of Monte Carlo programs to automate the description of processes at an elementary constituent (parton) level.
Unified Theories  

The problem of the enormous weakness of the force of gravity compared to the strong and electroweak forces (the hierarchy problem) is the motivation for the formulation of supersymmetric theories (SUSY), technicolour theories and Grand Unified Theories (e.g. SU(5)-SO(10)). They all predict a plethora of new particles (supersymmetric scalar partners, techniparticles, monopoles, strings, Q-balls) as a result of novel symmetry breaking energy scales (Low Energy Sypersymmetry Breaking –10 Tev, GUT symmetry breaking -1015 Gev, Technicolour Confinement - 10 Tev). New Phenomena which are predicted by these theories are studied intensely both theoretically and experimentally In the Institute of Nuclear Physics.
They include:
·Baryon and lepton number violations - baryon decay, Baryogenesis - Leptogenesis in Cosmology
·Inflaton Dynamics in cosmology (Inflationary Cosmology, Quintessence, Dark Matter and Energy, Structure Formation)
·Neutrino Oscillations and Masses
·Monopoles in Astrophysics and Cosmology, Cosmic Strings in Structure Formation, Q-balls as Dark Matter.
   
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Additional Information

For more information contact:

NCSR DEMOKRITOS
Institute of Nuclear Physics
Gr-15310 Aghia Paraskevi
GREECE
tel: +30 2106503512
fax: +30 2106511215
email: info@inp.demokritos.gr