TL;DR
This paper reviews the unification of string theories via M-theory, discusses recent advances in brane-world models, and highlights unresolved challenges in the field.
Contribution
It presents new developments in brane-world scenarios, including overcoming no-go theorems and exploring the relationship between different models, along with a summary of key unsolved problems.
Findings
Circumvented no-go theorems for supersymmetric brane-worlds
Explored complementarity between Maldacena and Randall-Sundrum models
Discussed self-tuning mechanisms for the cosmological constant
Abstract
After reviewing how M-theory subsumes string theory, I report on some new and interesting developments, focusing on the ``brane-world'': circumventing no-go theorems for supersymmetric brane-worlds, complementarity of the Maldacena and Randall-Sundrum pictures; self-tuning of the cosmological constant. I conclude with the top ten unsolved problems.
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