I discuss some new trends in Particle Theory beyond the Standard Model. Some topics which are briefly covered include electroweak baryogenesis, gauge versus non-gauge discrete symmetries, the strong-CP problem, dynamical symmetry breaking scenarios, supersymmetric grand unification, new aspects in low-energy supersymmetry and superstring phe-

When 4-dimensional general relativity is extended by a 3-dimensional grav-itational Chern-Simons term an apparent violation of diffeormorphism invari-ance is extinguished by the dynamical equations of motion for the modified theory. The physical predictions of this recently proposed model show little evidence of symmetry breaking, but require the vanishing of the Pontryagin density.

We analyze a gauge-Higgs unification model which is based on a gauge theory defined on a six-dimensional spacetime with an S2 extra-space. We impose a symmetry condition for a gauge field and non-trivial boundary conditions of the S2. We provide the scheme for constructing a four-dimensional theory from the six-dimensional gauge theory under these conditions. We then construct a concrete model ...

Recent developments of physics at the TeV energy scale, especially physics related to the e + e − linear colliders are briefly reviewed. The topics include the present status of the standard model, Higgs physics, supersym-metry, strongly interacting electroweak symmetry breaking mechanism, and top quark physics.

Norbert Stoop, Romain Lagrange, Denis Terwagne2∗, Pedro M. Reis, and Jörn Dunkel Department of Mathematics, Massachussetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA Department of Civil & Environmental Engineering, Massachussetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA Department of Mechanical Engineering, Massachusset...

For the first time, charge symmetry breaking terms in parton distribution functions have been included in a global fit to high energy data. We review the results obtained for both valence and sea quark charge symmetry violation, and we compare these results with the most stringent experimental upper limits on charge symmetry violation for parton distribution functions, and with theoretical esti...

It is shown that most of the unusual properties of the lowest lying scalar (and pseudoscalar) mesons can be understood, at the qualitative and quantitative level, on the basis of the breakdown of the UA(1) symmetry coupled to the vacuum expectation values of scalars by the spontaneous breaking of chiral symmetry.

This paper considers matrix models, a class of CSPs which generally exhibit significant symmetries. It proposed the idea of LexLeader feasibility checkers that verify, during search, whether the current partial assignment can be extended into a canonical solution. The feasibility checkers are based on a novel result by [Katsirelos et al., 2010] on how to check efficiently whether a solution is ...