In this paper, we investigate the asymptotic structure of gauge theories in
    decelerating and spatially flat Friedmann-Lema\^itre-Robertson-Walker
    universes. Firstly, we thoroughly explore the asymptotic symmetries of
    electrodynamics in this background, which reveals a major inconsistency already
    present in the flat case. Taking advantage of this treatment, we derive the
    associated memory effects, discussing their regime of validity and differences
    with respect to their flat counterparts. Next, we extend our analysis to
    non-Abelian Yang-Mills, coupling it dynamically and simultaneously to a Dirac
    spinor and a complex scalar field. Within this novel setting, we examine the
    possibility of constructing Poisson superbrackets based on the covariant phase
    space formalism.

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