Dark Energy in String Theory
BRIAN R. GREENE, Gary Shiu · Advanced series on directions in high energy physics · 2015
We review the tension between the observational evidence for dark energy and various theoretical considerations. This tension has motivated a reconsideration of the issue of naturalness, and spawned various exotic approaches toward an acceptable solution. We discuss attempts to realize dark energy in string theory, and the perspective on the string landscape that these results have suggested.