Ground states of the defocusing nonlinear Schrödinger equation with a point interaction in dimensions 2 and 3
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| Format: | Preprint |
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2026
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| _version_ | 1866913149408509952 |
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| author | Ikeda, Masahiro Ramos, Gustavo de Paula |
| author_facet | Ikeda, Masahiro Ramos, Gustavo de Paula |
| contents | This paper is concerned with ground states of the defocusing nonlinear Schrödinger equation with a point interaction, \[ \mathrm{i} \partial_t ψ=
-Δ_αψ+ ψ|ψ|^{p - 2} \quad \text{in} \quad \mathbb{R} \times \mathbb{R}^N, \] where $- Δ_α$ denotes the Laplacian of point interaction centered at the origin with inverse s-wave scattering length $- 2 (N - 1) πα$ and we suppose that either (i) $N = 2$, $α\in \mathbb{R}$ and $p > 2$ or (ii) $N = 3$, $α< 0$ and $2 < p < 3$. At sufficiently small masses, (i) we prove that this equation admits ground states, (ii) we obtain some qualitative properties of ground states and (iii) we obtain some results relating ground states with critical points of the associated action functional. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_21126 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ground states of the defocusing nonlinear Schrödinger equation with a point interaction in dimensions 2 and 3 Ikeda, Masahiro Ramos, Gustavo de Paula Analysis of PDEs This paper is concerned with ground states of the defocusing nonlinear Schrödinger equation with a point interaction, \[ \mathrm{i} \partial_t ψ= -Δ_αψ+ ψ|ψ|^{p - 2} \quad \text{in} \quad \mathbb{R} \times \mathbb{R}^N, \] where $- Δ_α$ denotes the Laplacian of point interaction centered at the origin with inverse s-wave scattering length $- 2 (N - 1) πα$ and we suppose that either (i) $N = 2$, $α\in \mathbb{R}$ and $p > 2$ or (ii) $N = 3$, $α< 0$ and $2 < p < 3$. At sufficiently small masses, (i) we prove that this equation admits ground states, (ii) we obtain some qualitative properties of ground states and (iii) we obtain some results relating ground states with critical points of the associated action functional. |
| title | Ground states of the defocusing nonlinear Schrödinger equation with a point interaction in dimensions 2 and 3 |
| topic | Analysis of PDEs |
| url | https://arxiv.org/abs/2605.21126 |