Topological String Defect Formation During the Chiral Phase Transition

We extend and generalize the seminal work of Brandenberger, Huang and Zhang on the formation of strings during chiral phase transitions(berger) and discuss the formation of abelian and non-abelian topological strings during such transitions in the early Universe and in the high energy heavy-ion collisions. Chiral symmetry as well as deconfinement are restored in the core of these defects. Formation of a dense network of string defects is likely to play an important role in the dynamics following the chiral phase transition. We speculate that such a network can give rise to non-azimuthal distribution of transverse energy in heavy-ion collisions.Comment: 10 pages, 4 figures, minor correction

Progress on the hybrid gun project at UCLA

UCLA/INFN-LNF/Univ. Rome has been developing the hybrid gun which has an RF gun and a short linac for velocity bunching in one structure. After the cavity was manufactured at INFN-LNF in 2012, tests of the gun was carried out at UCLA. The field in the standing wave part was 20 % smaller than the simulation but the phase advance was fine. The cavity was commissioned successfully up to 13 MW. The beam test was performed at 11.5 MW and demonstrated the bunch compression

Numerical Study of the Lowest Energy Configurations for Global String-Antistring Pairs

We investigate the lowest energy configurations for string - antistring pairs at fixed separations by numerically minimizing the energy. We show that for separations smaller than a critical value, a region of false vacuum develops in the middle due to large gradient energy density. Consequently, well defined string - antistring pairs do not exist for such separations. We present an example of vortex - antivortex production by vacuum bubbles where this effect seems to play a dynamical role in the annihilation of the pair. We also study the dependence of the energy of an string-antistring pair on their separation and find deviations from a simple logarithmic dependence for small separations.Comment: 14 pages, in LATEX, 7 figures (not included

Second Stage String Fragmentation Model

A string model, advocated by Bowler, provides a physical and intuitive picture of heavy quark fragmentation. When supplemented by an ad hoc factor of (1-z), to suppress fragmentation near z=1, it supplies an excellent fit to the data. We extend Bowler's model by accounting for the further decay of the massive mesonic states produced by the initial string breaking. We find that each subsequent string break and cascade decay beyond the first, introduces a factor of (1-z). Furthermore we find that including a finite mass for the quarks, which pop out of the vacuum and split the string, forces the first string breaking to produce massive states requiring further decay. This sequence terminates at the second stage of fragmentation where only relatively "light" heavy meson systems are formed. Thus we naturally account for the phenomenologically required factor of (1-z). We also predict that the ratio of (primary) fragments-vector/(vector plus scalar) should be .61. Our second stage string fragmentation model provides an appealing picture of heavy quark fragmentation.Comment: 15 page

Solving Long Lead Times and the High Cost of Space Solar Panels With Upgraded Silicon Technology

Solestial is developing 100% US made solar cells and blankets with \u3e 18% BOL efficiency, over 10 years lifespan, \u3c 3% annual degradation rate, \u3c 400 g/m2 specific mass, \u3e 10 MW manufacturing capacity and $20/W price by 2025. This new solar technology will be beneficial for the projects where high cost, long lead times and low manufacturing capacity of space-grade solar cells and panels are the major barriers for implementation. Here we describe the main features of our solar cells and blankets

The Future of Corporate Tax Reform: A Debate

Professor Geier participated in a Lincoln-Douglas style debate, where the debaters were assigned different roles, so the opinions expressed were not necessarily their own. On the first point debated, Professor Geier was assigned to argue: The Affirmative: We Need to Tax Corporationsat the Entity Level. Others argued the negative: The United States Should Repeal the Corporate Income Tax. On the second point debated, Professor Geier argued the negative, that Dividend Exemption Is NOT the Best Method of Corporate/Shareholder Integration, and is in fact the worst method. On the third point, Professor Geier argued in the affirmative, that the corporate tax rate should be lowered to below 35% in a revenue neutral way

The Future of Corporate Tax Reform: A Debate

Professor Geier participated in a Lincoln-Douglas style debate, where the debaters were assigned different roles, so the opinions expressed were not necessarily their own. On the first point debated, Professor Geier was assigned to argue: The Affirmative: We Need to Tax Corporationsat the Entity Level. Others argued the negative: The United States Should Repeal the Corporate Income Tax. On the second point debated, Professor Geier argued the negative, that Dividend Exemption Is NOT the Best Method of Corporate/Shareholder Integration, and is in fact the worst method. On the third point, Professor Geier argued in the affirmative, that the corporate tax rate should be lowered to below 35% in a revenue neutral way

Semiclassical wave equation and exactness of the WKB method

The exactness of the semiclassical method for three-dimensional problems in quantum mechanics is analyzed. The wave equation appropriate in the quasiclassical region is derived. It is shown that application of the standard leading-order WKB quantization condition to this equation reproduces exact energy eigenvalues for all solvable spherically symmetric potentials.Comment: 13 page