Abstract
A rule of thumb derivation of the Dirac–Born–Infeld action for D-branes is studied à la Fradkin and Tseytlin, by simply integrating out of the superstring coordinates in a narrow strip attached to the D-branes. In case of superstrings, the coupling of Ramond–Ramond fields as well as the Dirac–Born–Infeld type coupling of the Neveu Schwarz–Neveu Schwarz fields come out in this way.
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