Localizing Gravity on a String-Like Defect in Six Dimensions

TL;DR

This paper introduces a six-dimensional model with a string-like defect that localizes gravity, showing suppressed corrections to four-dimensional gravity without fine-tuning the cosmological constant.

Contribution

It provides a new six-dimensional metric solution that localizes gravity on a string-like defect without requiring tuning between bulk cosmological constant and brane tension.

Findings

Gravity is localized on a 4D defect in 6D spacetime.

Corrections to 4D gravity are suppressed by O(1/r^3).

No fine-tuning needed between bulk cosmological constant and brane tension.

Abstract

We present a metric solution in six dimensions where gravity is localized on a four-dimensional singular string-like defect. The corrections to four-dimensional gravity from the bulk continuum modes are suppressed by ${\cal O}(1/r^3)$. No tuning of the bulk cosmological constant to the brane tension is required in order to cancel the four-dimensional cosmological constant.