14.3 Penrose transform

^[1]<ol><li>Ashtekar:2021kfp</li><li>Bodendorfer:2016uat</li><li>Ashtekar:2014kba</li><li>Rovelli:2014ssa</li><li>Rovelli:2011eq</li><li>Rovelli:2004tv</li><li>Thiemann:2001gmi</li><li>Thiemann:2006cf</li></ol>. For criticism see ^[2]<ol><li>Nicolai:2005mc</li></ol>. \subsection{Ashtekar variables} \subsection{Quantum Riemannian geometry} \subsection{Spin foams} ^[3]<ol><li>Steinhaus:2020lgb</li></ol> \subsection{Black hole entropy} ^[4]<ol><li>BarberoG:2022ixy</li><li>Ashtekar:2025ptw</li></ol> \subsection{Loop quantum cosmology} ^[5]<ol><li>Ashtekar:2011ni</li></ol>

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