We present the Yano-Koonin-Podgoretski˘ ı parametrisation of the correlation function. Compared to the conventionally used Cartesian parametrisation, this one provides more straightforward measurement of the duration of the emission process in the fireball and a clearer signal of the longitudinal expansion, which is expected in ulrarelativistic heavy ion collisions.

Why the real time formalism doesn't factorise * Abstract We show that in the real time formalism, the generating functional for thermal Green functions does not factorise. However for most calculations, the normal real time Feynman rules can still be used to give correct results. In this talk, I shall be concerned with the Real Time Formalism (RTF) of equilibrium thermal field theory as describ...

We present the Yano-Koonin-Podgoretski˘ ı parametrisation of the correlation function. Compared to the conventionally used Cartesian parametrisation, this one provides more straightforward measurement of the duration of the emission process in the fireball and a clearer signal of the longitudinal expansion, which is expected in ulrarelativistic heavy ion collisions.

The Dirac equation is solved using three-dimensional Finite DifferenceTime Domain (FDTD) method. Zitterbewegung and the dynamics of a well-localized electron are used as examples of FDTD application to the case of free electrons. PACS numbers: 03.65.Pm, 02.60.-x, 02.60.Lj § Correspondence should be addressed to Louisiana Tech University, PO Box 10348, Ruston, LA 71272, Tel: +1.318.257.3591, Fax...

I describe the work of Olevski˘ ı, Tao and others on the rearrangement of orthogonal series. It turns out that arbitrary rearrangements produce trouble for all orthogonal and wavelet methods, that decreasing rearrangements produce trouble for Fourier series, but that wavelet expansions continue to work well under decreasing rearrangement.