119471275
A Chern-Simons-like action for closed-string field theory
A Chern-Simons-like action is proposed for closed-string field theory. The action involves auxiliary fields of arbitrary ghost number and is defined in terms of the closed-string operations integral , Q and, analogous to those introduced by Witten (1986) in the construction of open-string field theory. The action is an extension of one proposed for free closed strings and bears a formal relationship to 2+1 gravity analogous to that between open-string field theory and (2+1)-dimensional Yang-Mills theory.
116979191
Symplectic Reduction of the Minimally Coupled Massless Superparticle in D=10
In this study of the Brink-Schwarz superparticle in the presence of background non-abelian gauge field, we derive the D=10 super Yang-Mills curvature constraints by demanding an analog of the Siegel supersymmetry. We then show that, assuming F αβ = 0, the twistor transform proposed by Witten can be described using symplectic reduction.
121821236
The midpoint transformation in Witten's string field theory
Abstract We study the transformation to midpoint coordinates in Witten's string field theory using a ζ-function regularization. We find that the vertex is well defined and local (in that it makes no explicit reference to the midpoint coordinate) as the regulator is removed. This is in contrast to the heat-kernel regularization previously studied by others. We interpret the locality and unitarity anomalies of the heat-kernel regularization in terms of the associativity anomaly of the vertex. We also study the BRST charge in the same limit, verify that it is well defined, and propose a sense in which it is nilpotent. We then argue that the transformed vertex is BRST invariant. We discuss the structure of the space of states in the transformed theory; physical states are singular as the regulator is removed, suggesting that they be interpreted in a distributional sense.
124532074
FAD, DCCs and Minimax
SummaryThere is a need to more fully exploit the intrinsic diversity of hadron-hadron collisions. The Full-Acceptance Detector (FAD) initiative was a proposal to do so at the SSC. With the demise of the SSC, it is useful to review the motivation for FAD, and the prospects for pursuing Full-Acceptance Physics at present and future hadron colliders. Particular attention is paid to T864 (MiniMax) at Fermilab, a chiral condensate search which has developed out the FAD enterprise.
14127729
THE ORIGIN OF THE DUST ARCH IN THE HALO OF NGC 4631: AN EXPANDING SUPERBUBBLE?
We study the nature and the origin of the dust arch in the halo of the edge-on galaxy NGC 4631 detected by Neininger & Dumke. We present CO observations made using the new on-the-fly mapping mode with the Five College Radio Astronomy Observatory 14 m telescope and find no evidence for CO emission associated with the dust arch. Our examination of previously published H I data shows that, if previous assumptions about the dust temperature and gas/dust ratio are correct, then there must be molecular gas associated with the arch, below our detection threshold. If this is true, then the molecular mass associated with the dust arch is between 1.5 × 108 M⊙ and 9.7 × 108 M⊙, and likely toward the low end of the range. A consequence of this is that the maximum allowed value for the CO-to-H2 conversion factor is 6.5 times the Galactic value, but most likely closer to the Galactic value. The kinematics of the H I apparently associated with the dust arch reveals that the gas here is not part of an expanding shell or outflow but is instead two separate features (a tidal arm and a plume of H I sticking out into the halo) that are seen projected together and appear as a shell. Thus there is no connection between the dust "arch" and the hot X-ray–emitting gas that appears to surround the galaxy.
14490517
Discovery of Molecular Gas in the Outflow and Tidal Arms around M82
We present the first fully sampled map of 12CO (1-0) emission from M82 covering the entire galaxy. Our map contains an ~12 × 15 kpc2 area. We find that extraplanar CO emission, previously reported at short distances above the galactic plane, extends to heights of up to 6 kpc above the disk. Some of this emission is associated with tidal arms seen in H I, implying either that M82 contained substantial amounts of molecular gas in the outer disk or that molecular gas formed after the tidal features. CO emission along the direction of the outflow extends to distances of ~3 kpc above and below the disk. At this distance, the line is shifted in velocity ~100 km s-1 and has the same sense as the galactic outflow from the central starburst. This implies that molecular gas may be entrained into the outflow.