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Motivated by the swampland conjectures, we study cosmological signatures of aquintessence potential which induces time variation in the low energy effectivefield theory. After deriving the evolution of the quintessence field, weillustrate its possible ramifications by exploring putative imprints in anumber of directions of particle phenomenology. We first show that a darkmatter self-interaction rate increasing with time gives a novel way ofreconciling the large self interactions required to address small scalestructure issues with the constraint coming from clusters. Next, we study theeffects of kinetic mixing variation during the radiation dominated era onfreeze-in dark matter production. Last, we elucidate quintessence effects onthe restoration of the electroweak symmetry at finite temperature and thelifetime of the electroweak vacuum through a modification of the effectiveHiggs mass and quartic coupling.

Forays into the dark side of the swamp