A uniformly accelerated reference frame S is defined as a set of observers who remain at rest with respect to a given observer A who is accelerating at a constant rate with respect to the instantaneously comoving inertial frames. The one-dimensional uniformly accelerated reference frame S is considered. The world lines of A and the other observers making up S are determined. Coordinates useful for describing events in S are carefully defined and the transformation equations between different sets of them are derived. The variation with position in S of the speed and frequency of light waves is determined. The motion of a free-particle in S is determined. Various phenomena in S, ordinarily associated with general relativity, are considered, in particular the asymmetric aging of twins at rest at different positions and the existence of horizons.

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Carr, Bloom, Petrovich, and Philpott Reply: Geesaman and Zeidman l have pointed out a deficiency in the double ratio (R-Rz/Rs) of isoscalar to isovector inelastic scattering strengths (Rz^Zo/Z?) and proton stripping spectroscopic strengths (Rs~Sp/Sp) predicted in our recent large-basis shell-model study 2 of stretched 6~ states in 28 Si as compared with experiment. This is a valid point which was inadequately discussed in our Letter; however, Geesaman and Zeidman also make comparisons with an earlier, more restricted shell-model study 3 and introduce an "experimental" spectroscopic strength ratio 4 in a manner that obscures the improvement in our extended-basis calculation and exaggerates the problem with the double ratio.Specifically, the theoretical calculation of Ref. 3 predicts more than one "observable" 6 ~, !T-0 excitation as was emphasized in Fig. 1 of our Letter. This additional r-0 strength should be included when comparing the results of Ref. 3 with our work. Further, the experimental ratio (R ,wm Rs/R