AUTHOR=Eichhorn Astrid , Bahr Benjamin , Pereira Antonio D. TITLE=Editorial: Coarse Graining in Quantum Gravity: Bridging the Gap Between Microscopic Models and Spacetime-Physics JOURNAL=Frontiers in Physics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.686352 DOI=10.3389/fphy.2021.686352 ISSN=2296-424X