### Abstract

We study the existence of radially symmetric solutions of the following nonlinear scalar field equations in R N {\mathbb{R}^{N}} (N ≥ 2 {N\geq 2}): { - Δ u = g (u) - μ u in R N, ≈ u ≈ L 2 (R N) 2 = m, u ∈ H 1 (R N), \displaystyle\begin{cases}-\Delta u=g(u)-\mu u\quad\text{in }\mathbb{R}^{N},% \cr\lVert u\rVert-{L^{2}(\mathbb{R}^{N})}^{2}=m,\cr u\in H^{1}(\mathbb{R}^{N})%,\end{cases} where g (ξ) ∈ C (R, R) {g(\xi)\in C(\mathbb{R},\mathbb{R})}, m > 0 {m>0} is a given constant and μ ∈ R {\mu\in\mathbb{R}} is a Lagrange multiplier. We introduce a new approach using a Lagrange formulation of problem (∗) m {(∗)-{m}}. We develop a new deformation argument under a new version of the Palais-Smale condition. For a general class of nonlinearities related to [H. Berestycki and P.-L. Lions, Nonlinear scalar field equations. I: Existence of a ground state, Arch. Ration. Mech. Anal. 82 (1983), no. 4, 313-345], [H. Berestycki and P.-L. Lions, Nonlinear scalar field equations. II. Existence of infinitely many solutions, Arch. Ration. Mech. Anal. 82 (1983), no. 4, 347-375], [J. Hirata, N. Ikoma and K. Tanaka, Nonlinear scalar field equations in R N {\mathbb{R}^{N}}: Mountain pass and symmetric mountain pass approaches, Topol. Methods Nonlinear Anal. 35 (2010), no. 2, 253-276], it enables us to apply minimax argument for L 2 {L^{2}} constraint problems and we show the existence of infinitely many solutions as well as mountain pass characterization of a minimizing solution of the problem inf { ∫ R N 1 2 | Δ u | 2 - G (u) d x: ≈ u ≈ L 2 (R N) 2 = m }, G (ξ) = ∫ 0 ξ g (τ) τ. \inf\Bigg{\{}\int-{\mathbb{R}^{N}}{1\over 2}|{\nabla u}|^{2}-G(u)\,dx:\lVert u% \rVert-{L^{2}(\mathbb{R}^{N})}^{2}=m\Bigg{\}},\quad G(\xi)=\int-{0}^{\xi}g(% \tau)\,d\tau.

Original language | English |
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Journal | Advanced Nonlinear Studies |

DOIs | |

Publication status | Accepted/In press - 2019 Jan 1 |

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### Keywords

- Deformation Theory
- Normalized Solutions

### ASJC Scopus subject areas

- Statistical and Nonlinear Physics
- Mathematics(all)

### Cite this

**Nonlinear Scalar Field Equations with L ^{2} Constraint : Mountain Pass and Symmetric Mountain Pass Approaches.** / Hirata, Jun; Tanaka, Kazunaga.

Research output: Contribution to journal › Article

}

TY - JOUR

T1 - Nonlinear Scalar Field Equations with L 2 Constraint

T2 - Mountain Pass and Symmetric Mountain Pass Approaches

AU - Hirata, Jun

AU - Tanaka, Kazunaga

PY - 2019/1/1

Y1 - 2019/1/1

N2 - We study the existence of radially symmetric solutions of the following nonlinear scalar field equations in R N {\mathbb{R}^{N}} (N ≥ 2 {N\geq 2}): { - Δ u = g (u) - μ u in R N, ≈ u ≈ L 2 (R N) 2 = m, u ∈ H 1 (R N), \displaystyle\begin{cases}-\Delta u=g(u)-\mu u\quad\text{in }\mathbb{R}^{N},% \cr\lVert u\rVert-{L^{2}(\mathbb{R}^{N})}^{2}=m,\cr u\in H^{1}(\mathbb{R}^{N})%,\end{cases} where g (ξ) ∈ C (R, R) {g(\xi)\in C(\mathbb{R},\mathbb{R})}, m > 0 {m>0} is a given constant and μ ∈ R {\mu\in\mathbb{R}} is a Lagrange multiplier. We introduce a new approach using a Lagrange formulation of problem (∗) m {(∗)-{m}}. We develop a new deformation argument under a new version of the Palais-Smale condition. For a general class of nonlinearities related to [H. Berestycki and P.-L. Lions, Nonlinear scalar field equations. I: Existence of a ground state, Arch. Ration. Mech. Anal. 82 (1983), no. 4, 313-345], [H. Berestycki and P.-L. Lions, Nonlinear scalar field equations. II. Existence of infinitely many solutions, Arch. Ration. Mech. Anal. 82 (1983), no. 4, 347-375], [J. Hirata, N. Ikoma and K. Tanaka, Nonlinear scalar field equations in R N {\mathbb{R}^{N}}: Mountain pass and symmetric mountain pass approaches, Topol. Methods Nonlinear Anal. 35 (2010), no. 2, 253-276], it enables us to apply minimax argument for L 2 {L^{2}} constraint problems and we show the existence of infinitely many solutions as well as mountain pass characterization of a minimizing solution of the problem inf { ∫ R N 1 2 | Δ u | 2 - G (u) d x: ≈ u ≈ L 2 (R N) 2 = m }, G (ξ) = ∫ 0 ξ g (τ) τ. \inf\Bigg{\{}\int-{\mathbb{R}^{N}}{1\over 2}|{\nabla u}|^{2}-G(u)\,dx:\lVert u% \rVert-{L^{2}(\mathbb{R}^{N})}^{2}=m\Bigg{\}},\quad G(\xi)=\int-{0}^{\xi}g(% \tau)\,d\tau.

AB - We study the existence of radially symmetric solutions of the following nonlinear scalar field equations in R N {\mathbb{R}^{N}} (N ≥ 2 {N\geq 2}): { - Δ u = g (u) - μ u in R N, ≈ u ≈ L 2 (R N) 2 = m, u ∈ H 1 (R N), \displaystyle\begin{cases}-\Delta u=g(u)-\mu u\quad\text{in }\mathbb{R}^{N},% \cr\lVert u\rVert-{L^{2}(\mathbb{R}^{N})}^{2}=m,\cr u\in H^{1}(\mathbb{R}^{N})%,\end{cases} where g (ξ) ∈ C (R, R) {g(\xi)\in C(\mathbb{R},\mathbb{R})}, m > 0 {m>0} is a given constant and μ ∈ R {\mu\in\mathbb{R}} is a Lagrange multiplier. We introduce a new approach using a Lagrange formulation of problem (∗) m {(∗)-{m}}. We develop a new deformation argument under a new version of the Palais-Smale condition. For a general class of nonlinearities related to [H. Berestycki and P.-L. Lions, Nonlinear scalar field equations. I: Existence of a ground state, Arch. Ration. Mech. Anal. 82 (1983), no. 4, 313-345], [H. Berestycki and P.-L. Lions, Nonlinear scalar field equations. II. Existence of infinitely many solutions, Arch. Ration. Mech. Anal. 82 (1983), no. 4, 347-375], [J. Hirata, N. Ikoma and K. Tanaka, Nonlinear scalar field equations in R N {\mathbb{R}^{N}}: Mountain pass and symmetric mountain pass approaches, Topol. Methods Nonlinear Anal. 35 (2010), no. 2, 253-276], it enables us to apply minimax argument for L 2 {L^{2}} constraint problems and we show the existence of infinitely many solutions as well as mountain pass characterization of a minimizing solution of the problem inf { ∫ R N 1 2 | Δ u | 2 - G (u) d x: ≈ u ≈ L 2 (R N) 2 = m }, G (ξ) = ∫ 0 ξ g (τ) τ. \inf\Bigg{\{}\int-{\mathbb{R}^{N}}{1\over 2}|{\nabla u}|^{2}-G(u)\,dx:\lVert u% \rVert-{L^{2}(\mathbb{R}^{N})}^{2}=m\Bigg{\}},\quad G(\xi)=\int-{0}^{\xi}g(% \tau)\,d\tau.

KW - Deformation Theory

KW - Normalized Solutions

UR - http://www.scopus.com/inward/record.url?scp=85060714228&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060714228&partnerID=8YFLogxK

U2 - 10.1515/ans-2018-2039

DO - 10.1515/ans-2018-2039

M3 - Article

AN - SCOPUS:85060714228

JO - Advanced Nonlinear Studies

JF - Advanced Nonlinear Studies

SN - 1536-1365

ER -