
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, Qballs) 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,
Qballs as Dark Matter. 













For more information contact:
NCSR DEMOKRITOS
Institute of Nuclear Physics
Gr15310 Aghia Paraskevi
GREECE
tel: +30 2106503512
fax: +30 2106511215
email:
info@inp.demokritos.gr 
