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Subsystem symmetry has emerged as a powerful organizing principle forunconventional quantum phases of matter, most prominently fracton topologicalorders. Here, we focus on a special subclass of such symmetries, known ashigher-form subsystem symmetries, which allow us to adapt tools from the studyof conventional topological phases to the fracton setting. We demonstrate thatcertain transitions out of familiar fracton phases, including the X-cube model,can be understood in terms of the spontaneous breaking of higher-form subsystemsymmetries. We find simple pictures for these seemingly complicated fractontopological phase transitions by relating them in an exact manner, via gauging,to spontaneous higher-form subsystem symmetry breaking phase transitions ofdecoupled stacks of lower-dimensional models. We harness this perspective toconstruct a sequence of unconventional subdimensional critical points in twoand three spatial dimensions based on the stacking and gauging of canonicalmodels with higher-form symmetry. Through numerous examples, we illustrate theubiquity of coupled layer constructions in theories with higher-form subsystemsymmetries.

Higher-Form Subsystem Symmetry Breaking: Subdimensional Criticality and Fracton Phase Transitions