Abstract
We define size and shape in terms of observables, i.e. scattering amplitudes. Excited strings can be measured by scattering ground-state string probes off them. We pick an example where, classically, the ends of the string trace out a circle. Our calculation shows that the radius of the circle is proportional to the mass of the string, M, in agreement with classical expectations. However, on distance scales less than √In M, quantum fluctuations are important and a classical space-time picture becomes questionable.
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