Berkovits, Nathan [UNESP]2014-05-272014-05-271998-03-16Nuclear Physics B, v. 514, n. 1-2, p. 191-203, 1998.0550-3213http://hdl.handle.net/11449/130724Using linearized superfields, R4 terms in the Type II superstring effective action compactified on T2 are constructed as integrals in N = 2 D = 8 superspace. The structure of these superspace integrals allows a simple proof of the R4 non-renormalization theorems which were first conjectured by Green and Gutperle. © 1998 Elsevier Science B.V.191-203engArtigo10.1016/S0550-3213(97)00817-1WOS:000072925600009Acesso restrito2-s2.0-0032536627