TL;DR
This paper reviews the ongoing efforts and conceptual challenges in unifying general relativity with quantum theory, highlighting progress in string theory and loop quantum gravity over the past decades.
Contribution
It provides a comprehensive overview of current approaches and unresolved issues in the quest to quantize gravity, emphasizing conceptual foundations.
Findings
Progress in string theory and loop quantum gravity
Persistent conceptual challenges in quantum gravity
No complete solution achieved yet
Abstract
The problem of reconciling general relativity and quantum theory has fascinated and bedeviled physicists for more than 70 years. Despite recent progress in string theory and loop quantum gravity, a complete solution remains out of reach. I review the status of the continuing effort to quantize gravity, emphasizing the underlying conceptual issues and the various attempts to come to grips with them.
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