Mr
Grigory Vartanov
(Joint Institute for Nuclear Research)
31/07/2007, 14:00
Alternatives
Parallel Talk
We demonstrate how one can construct renormalizable
perturbative expansion in formally nonrenormalizable higher
dimensional field theories. It is based on $1/N$-expansion and
results in a logarithmically divergent perturbation theory in
arbitrary high space-time dimension. First, we consider a simple
example of $N$-component scalar filed theory and then extend this
approach to Abelian...
Mr
Petr Benes
(Department of Theoretical Physics, Nuclear Physics Institute, Rez near Prague, Czech Republic)
31/07/2007, 14:20
Alternatives
Parallel Talk
We consider a model with anomaly-free Abelian gauge axial-vector symmetry,
which is intended to mimic the standard electroweak gauge chiral SU(2)_L x
U(1)_Y theory. Within this model we demonstrate: (1) Strong Yukawa
interactions between massless fermion fields and a massive scalar field carrying
the axial charge generate dynamically the fermion and boson proper self-
energies, which are...
Dr
Tzu-Chiang Yuan
(National Tsing Hua University)
31/07/2007, 14:40
Alternatives
Parallel Talk
The hidden Stueckelberg Z' model is augmented by a pair of Dirac fermions. We show
that this hidden fermion-antifermion pair could be a milli-charged dark matter
candidate with a viable relic density. Existing terrestrial and astrophysical
searches on milli-charged particles do not place severe constraints on this hidden
fermion.
We calculate the flux of monochromatic photons coming...
Prof.
kingman Cheung
(Natl Tsing Hua Univ)
31/07/2007, 15:00
Alternatives
Parallel Talk
Phenomenology of the notion of an unparticle $\U$, recently perceived
by Georgi, to describe a scale invariant sector with a non-trivial
infrared fixed point at a higher energy scale is explored in details.
Behaving like a collection of $d_\U$ (the scale dimension of the
unparticle operator $\cal O_U$) invisible massless particles, this
unparticle can be unveiled by measurements of...
Dr
Xavier Calmet
(Université Libre de Bruxelles)
31/07/2007, 15:20
Alternatives
Parallel Talk
We consider gauge theories in a strong external magnetic like field. This situation can appear either in conventional
four-dimensional theories, but also naturally in extra-dimensional theories and especially in brane world models. We
show that in the lowest Landau level approximation, some of the coordinates become non-commutative. Our
construction is applied to a minimal extension of...
Prof.
Krzysztof Meissner
(Institute of Theoretical Physics, University of Warsaw)
31/07/2007, 15:40
Alternatives
Parallel Talk
We argue that radiative symmetry breaking in the Standard Model with classically
unbroken conformal symmetry in the presence of right-chiral neutrinos and a
minimally enlarged scalar sector naturally introduces and stabilizes a hierarchy
without the need for low energy supersymmetry. The model is compatible with all
available data; in particular, there exists a set of parameters for...
