# U(1) mixing and the Weak Gravity Conjecture

Abstract : Tiny values for gauge couplings of dark photons allow to suppress their kinetic mixing with ordinary photons. We point out that the Weak Gravity Conjecture predicts consequently low ultraviolet cut-offs where new degrees of freedom might appear. In particular, a mixing angle of $\mathcal{O}(10^{-15})$, required in order to fit the excess reported by XENON1T, corresponds to new physics below $\mathcal{O}(100)$ TeV, thus accessible at a Future Circular Collider. We show that possible realizations are provided by compactifications with six large extra dimensions and a string scale of order $\mathcal{O}(100)$ TeV.
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https://hal.archives-ouvertes.fr/hal-02905933
Contributor : Inspire Hep <>
Submitted on : Thursday, July 23, 2020 - 7:31:13 PM
Last modification on : Wednesday, August 5, 2020 - 5:59:20 AM

### Citation

Karim Benakli, Carlo Branchina, Gaëtan Lafforgue-Marmet. U(1) mixing and the Weak Gravity Conjecture. 2020. ⟨hal-02905933⟩

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