Postpartum Depression as Multi-Domain Ground State Transition Failure: Hormonal Collapse, Identity Displacement, and the Wrong Attractor of Maternal Anhedonia

We apply the Displacement Framework to postpartum depression (PPD), formalizing it as the predictable product of five simultaneous ground-state displacements occurring at childbirth: hormonal S° (estrogen/progesterone crash at the steepest hormonal gradient in human biology, with allopregnanolone collapse disrupting GABAergic tone), circadian S° (sleep fragmentation preventing nocturnal Φ-clearing), identity S° (matrescence — the structural transition from old self to maternal identity), relational S° (partner relationship restructured, new dependency bond), and somatic S°.

Ten formal propositions are derived covering: multi-domain displacement as the PPD landscape, maximal-rate hormonal crash as primary displacement trigger, the three-structure differentiation (baby blues = acute displacement with self-organized return; PPD = failed return entering W_PPD; postpartum psychosis = catastrophic displacement), maternal anhedonia wrong attractor deepened by shame-concealment positive feedback loop, matrescence as structural identity transition failure, sleep deprivation as displacement amplifier and return-path blocker, social isolation as basin-deepening mechanism (modern nuclear family stripping alloparenting infrastructure), brexanolone as displacement-mechanism reversal (synthetic ALLO targeting GABAergic collapse directly), multi-domain return path necessity, and paternal PPD as shared perinatal landscape displacement.

The framework shows PPD is not depression with a timing modifier but a structurally distinct wrong attractor with a unique shame-concealment deepening mechanism.