ar X iv : h ep - t h / 97 04 03 3 v 1 4 A pr 1 99 7 Global Phase Structure of the Heterotic Thermal String

ar X iv : h ep - t h / 99 04 15 5 v 2 2 7 A pr 1 99 9 TIT / HEP - 411

We discuss the possibility of the extension of the duality between the webs of heterotic string and the type IIA string to Calabi-Yau 3-folds with another K3 fiber by comparing the dual polyhedron of Calabi-Yau 3-folds given by Candelas, Perevalov and Rajesh. [email protected] [email protected]

ar X iv : h ep - t h / 99 04 15 5 v 1 2 3 A pr 1 99 9 TIT / HEP - 411 Puzzles on the Duality between

We discuss the possibility of the extension of the duality between the webs of heterotic string and the type IIA string to Calabi-Yau 3-folds with another K3 fiber by comparing the dual polyhedron of Calabi-Yau 3-folds given by Candelas, Perevalov and Rajesh. [email protected] [email protected]

ar X iv : h ep - t h / 97 07 19 5 v 1 2 3 Ju l 1 99 7 LMU - TPW - 97 / 19 The string scale and the Planck scale Rainer

A particle spectrum below the string scale in accordance with predictions from heterotic string theory yields a Planck mass mP l = (8πGN ) −1/2 which exceeds the string scale by a factor ≃ 61.9. A Planck mass mP l = 2.43× 1018 GeV then corresponds to a string scale ms = 3.9 × 1016 GeV. Such a low value for the string scale in turn implies that the relative strength of graviton and vector exchan...

ar X iv : h ep - t h / 99 04 15 5 v 3 2 5 A ug 1 99 9 TIT / HEP - 411 Puzzles on the Duality between Heterotic and Type IIA Strings

We discuss the possibility of the extension of the duality between the webs of heterotic string and the type IIA string to Calabi-Yau three-folds with another K3 fiber by comparing the dual polyhedron of Calabi-Yau three-folds given by Candelas, Perevalov and Rajesh. [email protected] [email protected]

ar X iv : h ep - t h / 97 03 05 4 v 1 6 M ar 1 99 7 Symmetries and the Antibracket : The Batalin - Vilkovisky Method