Beyond Endoscopy for $\mathrm{GL}(3,\mathbb{Q})$: Isolation of the residual spectrum via Poisson Summation

Taiwang Deng, Malors Espinos

We extend to $\mathrm{GL}(3,\mathbb{Q})$ the Poisson-summation method developed by Altuğ for $\mathrm{GL}(2,\mathbb{Q})$ in Beyond Endoscopy. For a fixed prime and a family of factor…