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Lower bounds for resonance counting functions for Schrödinger operators with fixed sign potentials in even dimensions
If d is even, the resonances of the Schrödinger operator -\Delta +V on \mathbb R^d with V\in L^{infty}_{\mathrm {comp}}(\mathbb R^d) are points on \Lambda , the logarithmic cover of \mathbb C \setminus \{0\} . We show that for fixed sign potentials V and for m\in \mathbb Z \setminus \{0\} , …