Extra dimensions in superstring theory

Extra Dimensions in Superstring Theory

TeV scale superstring and extra dimensions

Utilizing the idea of extra large dimensions, it has been suggested that the gauge and gravity couplings unification can happen at a scale as low as 1 TeV. In this paper, we explore this phenomenological possibility within string theory. In particular, we discuss how the proton decay bound can be satisfied in type I string theory. The string picture also suggests different scenarios of gauge an...

CLNS 98/1561 TeV Scale Superstring and Extra Dimensions

Utilizing the idea of extra large dimensions, it has been suggested that the gauge and gravity couplings uni cation can happen at a scale as low as 1 TeV. In this paper, we explore this possibility within string theory. In particular, we discuss how the proton decay bound can be satis ed in Type I string theory. The string picture also suggests di erent scenarios of gauge and gravitational coup...

A Superstring Theory in Four Curved Space-time Dimensions *

Neveu-Schwarz-Ramond type heterotic and type-II superstrings in four dimensional curved space-time are constructed as exact N = 1 superconformal theories. The tachyon is eliminated with a GSO projection. The theory is based on the N=1 superconformal gauged WZW model for the anti-de Sitter coset SO(3, 2)/SO(3, 1) with integer central extension k = 5. The model has dynamical duality properties in...

Effective Field Theory, Renomalizability and Extra Dimensions

We discuss in this paper two ways of defining the concept of “effective field theory”: effective field theory defined by low energy effectiveness and effective field theory defined by 4D effectiveness out of higher dimensions. We argue that these two views are actually equivalent, that effective field theories at low energy can in fact be regarded as field theories of higher dimensions confined...