1 v 2 2 9 A ug 1 99 4 LANDAU - 94 - TMP - 5 hep - th / 9408131 August 1994 EQUATIONS FOR CORRELATION FUNCTIONS

ar X iv : h ep - p h / 94 08 34 7 v 1 2 2 A ug 1 99 4 INFNCA - TH - 94 - 17 August 1994 DIMENSIONAL REDUCTION FOR FERMIONS ∗ MARCELLO

We generalize the concept of dimensional reduction to operators involving fermion fields in high temperature field theories. It is found that the ultraviolet behavior of the running coupling constant plays a crucial role. The general concept is illustrated explicitly in the Gross-Neveu model.

1 v 3 2 2 Ju l 1 99 4 hep - th / 9403011 HU − TFT − 94 − 9 On Solutions to the Twisted Yang - Baxter equation

Solutions to the twisted Yang-Baxter equation arising from intertwin-ers for cyclic representations of U q (sl n) are described via two coupled the lattice current algebras.

ar X iv : h ep - p h / 94 08 29 4 v 1 1 5 A ug 1 99 4 E 2 Strength in the Radiative Charmed Baryon Decay Σ ∗ c → Λ c γ †

The radiative decay ΣQ → ΛQγ can have both magnetic dipole (M1) and electric quadrupole (E2) components. In the heavy quark limit MQ → ∞ the transition arises from the spin of the light degrees of freedom changing from sl = 1 to sl = 0 and hence the E2 contribution vanishes. We compute the leading contribution to the E2 strength in chiral perturbation theory and find that the amplitude is enhan...

1 99 4 DFPD / 94 / TH / 17 hep - th / 9407091 NONPERTURBATIVE 2 D GRAVITY , PUNCTURED SPHERES AND Θ - VACUA IN STRING THEORIES

9 v 1 2 5 Ju l 1 99 4 DART - HEP - 94 / 03 July 1994

In this talk I briefly review the main ideas and challenges involved in the computation of the observed baryon asymmetry of the Universe. Based on invited talk given at “The Birth of the Universe and Fundamental Physics”, Rome,