On the Possibility of Non-Neutral Antiproton Plasmas and Antiproton-Positron Plasmas

Abstract. Progresses in accumulating a large number of low energy antiprotons with Antiproton Decelerator (AD), Radio Frequency Quadrupole Decelerator (RFQD), and a multiring trap in Atomic Spectroscopy And Collisions Using Slow Antiprotons (ASACUSA) enables the confinement of more than 10 6 antiprotons. Confinement of a larger number of antiprotons in the trap will result in a non-neutral antiproton plasma. This is also favorable for the effective production of low energy antiproton beams. Possibility of an antiproton-positron plasma is also considered in a magnetic mirror field

Anomalous U(1) D-term contribution in type I string models

We study the D-term contribution for anomalous U(1) symmetries in type I string models and derive a general formula for the D-term contribution, assuming that the dominant source of supersymmetry breaking is given by the F terms of the dilaton, (overall) moduli, or twisted moduli fields. On the basis of the formula, we also point out that there are several features different from the case of heterotic string models. The differences originate from the different forms of the Kahler potential between twisted moduli fields in type I string models and the dilaton field in heterotic string models.ArticlePHYSICAL REVIEW D. 69(8):086004 (2004)journal articl