ar X iv : h ep - t h / 97 06 12 9 v 1 1 8 Ju n 19 97 Heat - kernel coefficients for oblique boundary conditions

ar X iv : h ep - t h / 97 06 12 9 v 2 2 3 Ju n 19 97 Heat - kernel coefficients for oblique boundary conditions

We calculate the heat-kernel coefficients, up to a 2 , for a U(1) bundle on the 4-Ball for boundary conditions which are such that the normal derivative of the field at the boundary is related to a first-order operator in boundary derivatives acting on the field. The results are used to place restrictions on the general forms of the coefficients. In the specific case considered, there can be a ...

X iv : h ep - t h / 98 06 16 8 v 1 1 9 Ju n 19 98 The a 3 / 2 heat kernel coefficient for oblique boundary conditions

We present a method for the calculation of the a3/2 heat kernel coefficient of the heat operator trace for a partial differential operator of Laplace type on a compact Riemannian manifold with oblique boundary conditions. Using special case evaluations, restrictions are put on the general form of the coefficients, which, supplemented by conformal transformation techniques, allows the entire sme...

ar X iv : h ep - p h / 97 06 36 3 v 1 1 6 Ju n 19 97 Interference in the reaction e + e − → γπ + π − and the final state interaction

ar X iv : h ep - p h / 97 06 31 9 v 1 1 0 Ju n 19 97 MC - TH - 97 / 8 Photoproduction 1 Jeffrey

Some selected topics in photoproduction are reviewed. In particular, the focus is on quasi-real photon–proton scattering as measured at HERA. Single & dijet rates and jet profiles are discussed, as are open charm production and inelastic charmonium production. The many intriguing theoretical issues which can be addressed through study of these processes are highlighted.

ar X iv : h ep - p h / 97 06 31 3 v 1 1 0 Ju n 19 97 Forward - Backward Asymmetry

The Forward-backward asymmetry in the angular distribution of e + e possibility of observing CP-violation through the asymmetries in these two processes is examined.