SUSY07

Session

Alternatives 6

Alt6

31 Jul 2007, 14:00

Physics Building (Karlsruhe University)

124. Renormalizable 1/N Expansion for Field Theories in Extra Dimensions

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...

135. Dynamical breakdown of Abelian gauge chiral symmetry by strong Yukawa interactions

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...

176. Hidden fermion as milli-charged dark matter in Stueckelberg Z' model

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...

177. Novel signals in unparticle physics

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...

275. Noncommutative Higgs and/or Dark Matter Sectors

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...

355. Conformal Symmetry and the Standard Model

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...