
TL;DR
The paper develops a string theory framework called Orientiworld that embeds brane world scenarios with infinite-volume extra dimensions, reproduces 4D gravity, and constructs realistic particle physics models with chiral generations.
Contribution
It introduces a consistent string theory setup with orientifold planes and D-branes that achieves 4D gravity and realistic gauge theories, including a supersymmetric model with three chiral generations.
Findings
4D gravity is induced at the quantum level on D3-branes.
A scenario with TeV-scale string physics and crossover to 10D gravity at Hubble size.
Construction of an N=1 supersymmetric model with three chiral generations.
Abstract
We propose a consistent string theory framework for embedding brane world scenarios with infinite-volume extra dimensions. In this framework the Standard Model fields are localized on D3-branes sitting on top of an orientifold 3-plane. The transverse 6-dimensional space is a non-compact orbifold or a more general conifold. The 4-dimensional gravity on D3-branes is reproduced due to the 4-dimensional Einstein-Hilbert term induced at the quantum level. The orientifold 3-plane plays a crucial role, in particular, without it the D3-brane world-volume theories would be conformal due to the tadpole cancellation. We point out that in some cases the 4-dimensional Planck scale is controlled by the size of certain relevant (as opposed to marginal) orbifold blow-ups. We can then have a scenario with the desirable 4-dimensional Planck scale, the string scale of order TeV, and the cross-over to…
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