# Cosmology With a Very Light $L_\mu - L_\tau$ Gauge Boson

14 Mar 2019 Escudero Miguel Hooper Dan Krnjaic Gordan Pierre Mathias

In this paper, we explore in detail the cosmological implications of an abelian $L_\mu-L_\tau$ gauge extension of the Standard Model featuring a light and weakly coupled $Z'$. Such a scenario is motivated by the longstanding $\sim \, 4 \sigma$ discrepancy between the measured and predicted values of the muon's anomalous magnetic moment, $(g-2)_\mu$, as well as the tension between late and early time determinations of the Hubble constant... (read more)

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• HIGH ENERGY PHYSICS - PHENOMENOLOGY
• COSMOLOGY AND NONGALACTIC ASTROPHYSICS