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Currently, the standard cosmological model faces some tensions anddiscrepancies between observations at early and late cosmological time. One ofthem concerns the well-known $H_0$-tension problem, i.e., a$\sim4.4\sigma$-difference between the early-time estimate and late-timemeasurements of the Hubble constant, $H_0$. Another puzzling question rests inthe cosmological lithium abundance, where again local measurements differ fromthe one predicted by Big Bang Nucleosynthesis (BBN). In this work, we show thata mechanism of light dark matter production might hold the answer for thesequestions. If dark matter particles are sufficiently light and a fraction ofthem was produced non-thermally in association with photons, this mechanism hasprecisely what is needed to destroy Lithium without spoiling other BBNpredictions. Besides, it produces enough radiation that leads to a larger $H_0$value, reconciling early and late-time measurements of the Hubble expansionrate without leaving sizable spectral distortions in the Cosmic MicrowaveBackground spectrum.

Light Dark Matter: A Common Solution to the Lithium and ${H_0}$ Problems