ar X iv : h ep - t h / 99 09 21 0 v 1 2 9 Se p 19 99 SPbU - IP - 99 - 11 Casimir - Polder energy and dilute dielectric ball : nondispersive case

ar X iv : h ep - p h / 99 09 31 7 v 1 1 0 Se p 19 99 LAL 99 - 45 July 1999 AFTER SITGES F . RICHARD

ar X iv : h ep - e x / 99 09 03 9 v 1 2 3 Se p 19 99 The Partonic Structure of the Quasi - Real Photon

New measurements of dijet photoproduction at HERA provide information on the gluon density in the photon and on its quark densities at high x γ and high factorisation scales.

0 Casimir - Polder energy and dilute dielectric ball : nondispersive case

We apply general formalism of quantum field theory and addition theorem for Bessel functions to derive formula for the Casimir-Polder energy of interaction between a polarizable particle and a dilute dielectric ball and Casimir energy of a dilute dielectric ball. The correspondence between the Casimir-Polder formula and Casimir energy of a dilute dielectric ball is shown. Different approaches t...

ar X iv : h ep - t h / 99 01 01 1 v 1 4 J an 1 99 9 OKHEP – 99 – 01 The Casimir Effect : Physical Manifestations of Zero - Point Energy ∗

Zero-point fluctuations in quantum fields give rise to observable forces between material bodies, the so-called Casimir forces. In these lectures I present the theory of the Casimir effect, primarily formulated in terms of Green’s functions. There is an intimate relation between the Casimir effect and van der Waals forces. Applications to conductors and dielectric bodies of various shapes will ...

ar X iv : h ep - t h / 99 11 24 8 v 1 3 0 N ov 1 99 9 Casimir energy of a non - uniform string

The Casimir energy of a non-uniform string built up from two pieces with different speed of sound is calculated. A standard procedure of subtracting the energy of an infinite uniform string is applied, the subtraction being interpreted as the renormalization of the string tension. It is shown that in the case of a homogeneous string this method is completely equivalent to the zeta renormalizati...