ar X iv : h ep - p h / 93 11 37 1 v 1 2 9 N ov 1 99 3 Discrete Symmetries , Strong CP Problem and Gravity ∗
نویسنده
چکیده
Spontaneous breaking of parity or time reversal invariance offers a solution to the strong CP problem, the stability of which under quantum gravitational effects provides an upper limit on the scale of symmetry breaking. Even more important, these Planck scale effects may provide a simple and natural way out of the resulting domain wall problem. ∗Invited talk at the 4th Hellenic School on Elementary Particle Physics, Corfu, Greece, Septem-
منابع مشابه
ar X iv : h ep - p h / 93 11 32 0 v 1 1 9 N ov 1 99 3 An Extended Technicolor Model
An extended technicolor model is constructed. Quark and lepton masses, spontaneous CP violation, and precision electroweak measurements are discussed. Dynamical symmetry breaking is analyzed using the concept of the BIG MAC.
متن کاملar X iv : h ep - t h / 93 11 06 9 v 1 1 1 N ov 1 99 3 QUANTUM GROUPS
These notes correspond rather accurately to the translation of the lectures given at the Fifth Mexican School of Particles and Fields, held in Guanajuato, Gto., in Decem-ber 1992. They constitute a brief and elementary introduction to quantum symmetries from a physical point of view, along the lines of the forthcoming book by C. Gómez, G. Sierra and myself.
متن کاملar X iv : h ep - t h / 93 11 05 4 v 1 9 N ov 1 99 3 Preprint - KUL - TF - 93 / 47 hep - th / 9311054 November 1993
A topological gravity is obtained by twisting the effective (2, 0) supergravity. We show that this topological gravity has an infinite number of BRST invariant quantities with conformal weight 0. They are a tower of OSp(2, 2) multiplets and satisfy the classical exchange algebra of OSp(2, 2). We argue that these BRST invariant quantities become physical operators in the quantum theory and their...
متن کاملar X iv : h ep - t h / 93 11 13 2 v 1 2 2 N ov 1 99 3 Quantum integrable systems and representations of Lie algebras
Introduction A quantum many particle system on the line with an interaction potential U (x) is defined by the Hamiltonian
متن کاملar X iv : h ep - t h / 99 11 16 7 v 1 2 2 N ov 1 99 9 The Finiteness Requirement for Six - Dimensional
The finiteness requirement for Euclidean Einstein gravity is shown to be so stringent that only the flat metric is allowed. We examine counterterms in 4D and 6D Ricci-flat manifolds from general invari-ance arguments.
متن کامل