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