Gravity on a Brane in Infinite-Volume Extra Space

TL;DR

This paper demonstrates that Einstein's gravity can be effectively localized on a delta-function brane within an infinite-volume extra space, offering a potential solution to the cosmological constant problem.

Contribution

It generalizes previous models to show gravity localization on a brane in flat infinite-volume space with more than five dimensions, highlighting the infrared transparency phenomenon.

Findings

Gravity is localized on a delta-function brane in infinite extra space.

Bulk space exhibits infrared transparency for gravitons.

Framework offers a new approach to the cosmological constant problem.

Abstract

We generalize the mechanism proposed in [hep-th/0005016] and show that a four-dimensional relativistic tensor theory of gravitation can be obtained on a delta-function brane in flat infinite-volume extra space. In particular, we demonstrate that the induced Ricci scalar gives rise to Einstein's gravity on a delta-function type brane if the number of space-time dimensions is bigger than five. The bulk space exhibits the phenomenon of infrared transparency. That is to say, the bulk can be probed by gravitons with vanishing four-dimensional momentum square, while it is unaccessible to higher modes. This provides an attractive framework for solving the cosmological constant problem.