On String Field Theory and Effective Actions
نویسنده
چکیده
A truncation of string field theory is compared with the duality invariant effective action of D = 4, N = 4 heterotic strings to cubic order. The three string vertex must satisfy a set of compatibility conditions. Any cyclic three string vertex is compatible with the D = 4, N = 4 effective field theory. The effective actions may be useful in understanding the non–polynomial structure and the underlying symmetry of covariant closed string field theory, and in addressing issues of background independence. We also discuss the effective action and string field theory of the N = 2 string. e-mail address: [email protected]
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