Discussion:
Why zero slope limit is point particle limit?
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u***@gmail.com
2005-07-01 09:28:33 UTC
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Hi,

What is the easiest and/or best argument on that the string zero slope
limit alpha' ->0 is the point particle limit?

Thanks,
Kang-Sin
Robert C. Helling
2005-07-04 15:47:56 UTC
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Post by u***@gmail.com
Hi,
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
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Robert C. Helling School of Science and Engineering
International University Bremen
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