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The Infra-Red Road to Quantum Gravity
Samin Tajik, Michael. j. Desrochers, Philip C. E. Stamp·October 14, 2025
cond-mat.quant-gasgr-qcQuantum Physics
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Abstract
We review work in areas ranging from condensed matter physics to quantum gravity, with the following interconnected questions in mind: (i) what is the nature of the vacuum in condensed matter systems, in quantum field theory, and in classical and quantum gravity; (ii) how do analogies between these systems work, how well do they work, and how useful are they; (iii) what modifications can we make to quantum mechanics to deal with quantum gravity, and (iv) how and why low-energy theories of quantum gravity are, in our view, the right way to make progress in this field. We use many different examples to illustrate our arguments.