Superparticle actions in (10,2) and (11,3) dimensions are constructed. These actions have bosonic and fermionic gauge symmetries, and global target space supersymmety that generalize the reparametriza-tion, κ-symmetry and Poincaré supersymmetry of the usual superparticle. All these symmetries are realized in the phase space of two or three superparticles in (10,2) and (11,3) dimensions, respect...

We present results from magnetic monopoles in SU (2) lattice gauge theory at finite temperature. The lattices are 16 3 × N t , for N t = 4, 6, 8, 12, at β = 2.5115. Quantities discussed are: the spacial string tension, Polyakov loops, and the screening of timelike and spacelike magnetic currents.

We present preliminary data on the gluon propagator in generalized covariant gauges. The motivation for considering a generalized gauge-fixing procedure stems, just as in the continuum, from the necessity of studying the gauge dependence of the Green’s functions. In the covariant gauges it is possible to change the gauge fixing varying the value of the gauge parameter. In the continuum, the gen...

Using lattice simulations of a one-component (λΦ 4) 4 theory, we have measured the energy spectrum ω(k) in the broken phase at various lattice sizes. Our data show that the energy-gap ω(0) is not the 'Higgs mass' M h but an infrared-sensitive quantity that, conceivably, vanishes in the infinite-volume limit.

A manifestly gauge invariant exact renormalization group for pure SU(N) Yang-Mills theory is proposed, allowing gauge invariant calculations, without any gauge fixing or ghosts. The necessary gauge invariant regularisation which implements the effective cutoff, is naturally incorporated by embedding the theory into a spontaneously broken SU(N |N) super-gauge theory. This guarantees finiteness t...

The quantum gravity is formulated based on principle of local gauge invariance. The model discussed in this paper has local gravitational gauge symmetry and gravitational field appears as gauge field. The problems on quantization and renormalization of the theory are also discussed in this paper. In leading order approximation, the gravitational gauge field theory gives out classical Newton’s t...

Differential geometric formulation of quantum gauge theory of gravity is studied in this paper. The quantum gauge theory of gravity which is proposed in the references hep-th/0109145 and hep-th/0112062 is formulated completely in the framework of traditional quantum field theory. In order to study the relationship between quantum gauge theory of gravity and traditional quantum gravity which is ...