13 Other approaches

^[1]<ol><li>Dunajski:2023dsr</li><li>Woit:2022epr</li><li>scholze2017padic</li></ol>

Subsections

• 13.1 Black holes
• 13.2 Chern-Simons theories
• 13.3 Topological string theory
• 13.4 More on scattering amplitudes
• 13.5 Generalized symmetries
• 13.6 Pure spinor formalism
• 13.7 Nonrelativistic string theory
• 13.8 $2D$ theories
• 13.9 QCD Strings and Effective String Theories
• 13.10 Little string theory
• 13.11 Higher spin theory (tensionless limit)
• 13.12 Other proposals for quantum spacetime
• 13.13 Open problems in string theory

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