Causal sets: Discrete gravity

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Loop Quantum Gravity (2003, background): “Examples of other directions explored are noncommutative geometry [89], causal dynamical triangulations [13], causal sets [279], twistor theory [225], doubly-special relativity [166], and Euclidean quantum gravity [141, 144].”
Minimal Length Scale Scenarios for Quantum Gravity (2012, background): “eness does not necessarily imply a lower bound on the resolution of spatial distances. One discrete approach in which a minimal length scale makes itself noticeable in yet another way are Causal Sets [290]. In this approach, one considers as fundamental the causal structure of spacetime, as realized”
The causal set approach to quantum gravity (2019, background): “Interestingly, as shown by Sorkin (2005a), if spacetime admits large extra directions, then the contribution to V is very different and gives the wrong answer for ∆Λ.”
Gravity and the quantum (2004, background): “30,41], Euclidean quantum gravity [11,51], discrete approaches [42], twistor theory [10,20] and the theory of Hspaces [17], asymptotic quantization [18], non-commutative geometry [24] and causal sets [37]. B. Physical questions of quantum gravity Approaches to quantum gravity face two types of issue”