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We study the evolution of photon injections with a power-law type spectruminserted at various epochs of the universe, and obtain constraints on theirparameter space from multiple different cosmological probes. Our work ismotivated by the realistic possibility of having extended photon spectra fromastrophysical and exotic sources. Going beyond a $\delta$-function likeapproximation, the physics becomes richer and the constraining power ofcosmological probes starts to depend on the photon injection history in acomplex way. As a toy model, we first consider a decaying particle scenario,and then generalize to a more model independent power law type injection inredshift. Different combinations of our parameters can be mapped to a widevariety of realistic astrophysical and exotic sources, providing usefulbenchmarks for study in future work.

Constraining broad photon spectrum injections from exotic and astrophysical sources