Using the Fujikawa and the heat-kernel methods we make a complete and detailed computation of the global, gauge, and gravitational anomalies in the standard model defined on a curved space-time with torsion. We find new contributions coming from the curvature and the torsion to the leptonic number anomaly ~so that B-L is not conserved anymore! to the U~1!Y gauge and to the mixed U~1!Y-gravitati...

We consider an extension of the standard electroweak theory with gauge group SU(2)L × SU(2)R × U(1)Ỹ , where the gauge bosons of the extra SU(2)R factor do not couple to ordinary fermions. We show that precision electroweak data and flavour physics provide quite stringent indirect constraints on its parameter space, but still allow for relatively light non-standard gauge and Higgs bosons. We th...

We show how the problem of small neutrino masses and suppressed proton decay can be simultaneously resolved in 6-D universal extra dimension models (UED) with a low fundamental scale using extended gauge groups that contain the local B − L symmetry. The extra space dimensions are compactified either on a T /Z2 or T /Z2 × Z ′ 2 orbifold depending on whether the full gauge group is SU(2)L×U(1)I3R...

A non-perturbative solution to strong CP problem is proposed. It is shown that the gauge orbit space with gauge potentials and gauge tranformations restricted on the space boundary in non-abelian gauge theories with a θ term has a magnetic monopole structure if there is a magnetic monopole in the ordinary space. The Dirac’s quantization condition in the corresponding quantum theories ensures th...

Using the Fujikawa and the heat-kernel methods we make a complete and detailed computation of the global, gauge and gravitational anomalies present in the Standard Model defined on a curved space time with torsion. We find new contributions coming from curvature and torsion terms to the leptonic number anomaly (so that B − L is not conserved any more), to the U(1)Y gauge and to the mixed U(1)Y ...

We have performed a detailed Monte Carlo exploration of the parameter space for a warped Higgsless model of electroweak symmetry breaking in 5 dimensions. This model is based on the SU(2)L×SU(2)R×U(1)B−L gauge group in an AdS5 bulk with arbitrary gauge kinetic terms on both the Planck and TeV branes. Constraints arising from precision electroweak measurements and collider data are found to be r...

The space of static finite-energy configurations in the electroweak theory admits a Z2 topological structure. More precisely, we show that this space contains two disconnected sectors of unstable gauge-Higgs fields odd under a properly defined generalized parity. This classification extends the description of baryon and lepton number violating electroweak processes to the symmetric phase of the...

Quantum field theories based on noncommutative space-time (NCQFT) have been extensively studied recently. However no NCQFT model, which can uniquely describe the strong and electroweak interactions, has been constructed. This prevents consistent and systematic study of noncommutative space-time. In this work we construct a NCQFT model based on the trinification gauge group SU(3)C × SU(3)L × SU(...

We have performed a detailed Monte Carlo exploration of the parameter space for a warped Higgsless model of electroweak symmetry breaking in 5 dimensions. This model is based on the SU (2) L × SU (2) R × U (1) B−L gauge group in an AdS 5 bulk with arbitrary gauge kinetic terms on both the Planck and TeV branes. Constraints arising from precision electroweak measurements and collider data are fo...