505 research outputs found
Physical state representations and gauge fixing in string theory
We re-examine physical state representations in the covariant quantization of
bosonic string. We especially consider one parameter family of gauge fixing
conditions for the residual gauge symmetry due to null states (or BRST exact
states), and obtain explicit representations of observable Hilbert space which
include those of the DDF states. This analysis is aimed at giving a necessary
ingredient for the complete gauge fixing procedures of covariant string field
theory such as temporal or light-cone gauge.Comment: 16 page
Adsorption and Desorption of Bromine by Graphites
Isothermal adsorption and desorption of bromine by graphites and other carbonaceous compounds have been studied at 30°C or 80°C. The results were as follows: i. Quantity of bromine adsorbed decreases with charcoal, graphite, soot and pitch coke in order. With graphites, adsorptive capacity of natural graphite exceeds that of artificial graphite. ii. Effect of grain surface area upon quantity of adsorption is small with charcoal and graphite. iii. Plotting the adsorption process curve on a full logarithmic section paper, it is found to be inflected with graphite and to be straight with the other kinds. The positions of in flexion and the inclinations of the inflected lines are characteristic with graphites. iv. It is assumed that the point of inflexion and the inclination may be related to degree of graphitizing
The no-ghost theorem in curved backgrounds with a timelike u(1): NSR string
It is well-known that the standard no-ghost theorem is valid as long as the
background has the light-cone directions. We prove the no-ghost theorem for the
NSR string when only the timelike direction is flat. This is done by the BRST
quantization, using the technique of Frenkel, Garland and Zuckerman and our
previous results for the bosonic string. The theorem actually applies as long
as the timelike direction is written as a u(1) SCFT.Comment: 27 pages, AMS-LaTeX; v2: minor improvement
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