TeV Scale Superstring and Extra Dimensions
Gary Shiu, S.-H. Henry Tye

TL;DR
This paper explores the possibility of unifying gauge and gravity couplings at TeV scales within string theory, considering extra large dimensions and analyzing proton decay constraints in Type I string models.
Contribution
It provides a detailed phenomenological analysis of TeV scale unification scenarios in Type I string theory with explicit model examples.
Findings
Proton decay bounds can be satisfied in Type I string models.
Different unification scenarios are explicitly illustrated.
Features of these scenarios are likely generic in other Type I strings.
Abstract
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 and gravitational couplings unification. The various scenarios are explicitly illustrated with a specific 4-dimensional N=1 supersymmetric chiral Type I string model with Pati-Salam-like gauge symmetry. We point out certain features that should be generic in other Type I strings.
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