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What is the easiest and/or best argument on that the string zero slope
limit alpha' ->0 is the point particle limit?
alpha' is inversely proportional to the string tension. Sending it to
zero makes the string shrink to a point. Furthermore, all vibrations
of the string become infinitely costly in energy. In the quantum
theory, the masses of all the string modes are proportional to
1/alpha' so all but the massless modes decouple from the theory and
you are left only with the massless point-particles (hopefully, you've
already gotten rid of the tachyon).
Robert C. Helling School of Science and Engineering
International University Bremen
print "Just another Phone: +49 421-200 3574
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